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WO2018185879A1 - Pièce centrale de stator et machine électrique rotative - Google Patents

Pièce centrale de stator et machine électrique rotative Download PDF

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Publication number
WO2018185879A1
WO2018185879A1 PCT/JP2017/014241 JP2017014241W WO2018185879A1 WO 2018185879 A1 WO2018185879 A1 WO 2018185879A1 JP 2017014241 W JP2017014241 W JP 2017014241W WO 2018185879 A1 WO2018185879 A1 WO 2018185879A1
Authority
WO
WIPO (PCT)
Prior art keywords
width
stator core
groove
tip
inner peripheral
Prior art date
Application number
PCT/JP2017/014241
Other languages
English (en)
Japanese (ja)
Inventor
雄一朗 中村
智也 内村
信一 山口
治之 長谷川
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN201780074495.4A priority Critical patent/CN110036552B/zh
Priority to PCT/JP2017/014241 priority patent/WO2018185879A1/fr
Priority to KR1020197015172A priority patent/KR102077593B1/ko
Priority to JP2017555730A priority patent/JP6309178B1/ja
Priority to TW107105772A priority patent/TWI672891B/zh
Publication of WO2018185879A1 publication Critical patent/WO2018185879A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures

Definitions

  • the present invention relates to a stator core piece composed of a back yoke and a plurality of teeth provided on the inner peripheral side of the back yoke, and a rotating electrical machine.
  • a stator iron core of a rotating electrical machine disclosed in Patent Document 1 includes a yoke and a plurality of teeth provided on the yoke, and is arranged at the center of the stator iron core on the radially inner side of the teeth to reduce vibration due to torque pulsation.
  • a notch that opens toward the top is formed. The width of the notch in the radial direction of the rotating electrical machine is wider than the width of the notch in the circumferential direction of the central axis of the rotating electrical machine.
  • the present invention has been made in view of the above, and is capable of reducing both the cogging torque generated due to the combination of the number of magnetic poles and the number of slots and the cogging torque generated due to variations in the magnetic force of the magnet. Aim to obtain child core pieces.
  • the stator core piece of the present invention is a plurality of stator core pieces constituting an annular stator core, and the stator core piece includes a back yoke and A tooth provided on the inner peripheral side of the back yoke, and the tooth includes a base portion extending in the central axis direction from the circumferential center of the back yoke, and a tip portion provided on the inner peripheral side of the base portion, A groove having a shape in which the width in the circumferential direction changes stepwise toward the outer side in the radial direction of the stator core is formed in the inner peripheral portion of the distal end portion.
  • the radial width to the intersection is the first width, and from the first intersection to the bottom of the groove A third radial width to the intersection with bisector, when the second width, the second width, and wherein the narrower than the first width.
  • the stator core piece according to the present invention has an effect of reducing both the cogging torque generated due to the combination of the number of magnetic poles and the number of slots and the cogging torque generated due to variations in the magnetic force of the magnet.
  • FIG. 1 The perspective view of the stator core piece shown in FIG.
  • the figure which shows the 1st modification of the stator core piece shown in FIG. The figure which shows the 2nd modification of the stator core piece shown in FIG.
  • FIG. 1st figure which shows the relationship between the cogging torque which arises with the rotor which concerns on Embodiment 1, 2 and the width
  • channel. 2nd figure which shows the relationship between the cogging torque which arises with the rotor which concerns on Embodiment 1, 2 and the width
  • stator core piece and a rotating electrical machine according to an embodiment of the present invention will be described in detail based on the drawings. Note that the present invention is not limited to the embodiments.
  • FIG. 1 is a cross-sectional view in a direction orthogonal to the axial direction of the central axis of the rotating electrical machine including the stator core according to the first embodiment.
  • FIG. 2 is a perspective view of the stator core piece shown in FIG.
  • FIG. 3 is a view of the stator core piece shown in FIG. 1 as viewed from the end face side of the stator core in the axial direction of the central axis of the rotating electrical machine.
  • a rotating electrical machine 100 shown in FIG. 1 includes a stator 1 and a rotor 2 provided inside the stator 1.
  • the rotating electrical machine 100 is a 10-pole 12-slot motor.
  • the rotor 2 includes a rotor core 21, a shaft 22 provided on the rotor core 21, and a plurality of permanent magnets 23.
  • the number of magnetic poles 24 by the permanent magnet 23 is ten.
  • the rotor core 21 is configured by laminating a plurality of thin plates punched out from an electromagnetic steel plate base material (not shown) in the axial direction of the central axis AX of the annular stator core 11.
  • the axial direction of the central axis AX of the stator core 11 is the direction indicated by the arrow D1 in FIG. 2 and is equal to the axial direction of the central axis of the rotating electrical machine 100.
  • the plurality of thin plates are fixed to each other by caulking, welding, or bonding.
  • a gap is secured between the rotor core 21 and the stator 1.
  • the plurality of permanent magnets 23 may be embedded in the rotor core 21 or may be provided on the outer peripheral surface of the rotor core 21.
  • the shaft 22 is fixed to the axial center portion of the rotor core 21 by shrink fitting, cold fitting or press fitting.
  • the stator 1 includes a stator core 11 configured by annularly connecting a plurality of stator core pieces 11a, and a winding 12 formed by winding a coil that generates a rotating magnetic field around the stator core 11.
  • the stator core piece 11a is configured by laminating a plurality of thin plates punched out in a T shape from an electromagnetic steel plate base material (not shown) in the axial direction D1. The plurality of thin plates are fixed to each other by caulking, welding, or bonding.
  • the cross-sectional shape perpendicular to the axial direction D1 is symmetric with respect to the bisector CP10 of the cross-sectional shape.
  • the bisector CP10 is a line that bisects the distal end portion 11a21 in the circumferential direction D2. This is a line extending from the circumferential center 11a111 of the back yoke 11a1 in the direction of the central axis AX. The center 11a111 in the circumferential direction is located on the line 8 that bisects the width of the outer peripheral portion 11a11 of the back yoke 11a1 in the circumferential direction D2.
  • Each of the plurality of stator core pieces 11a includes a back yoke 11a1 and teeth 11a2 provided on the inner peripheral side 11a1a of the back yoke 11a1.
  • the teeth 11a2 extend from the back yoke 11a1 toward the central axis AX.
  • the teeth 11a2 include a base portion 11a22 extending from the circumferential center 11a111 of the back yoke 11a1 in the central axis AX direction, and a distal end portion 11a21 provided on the inner peripheral side of the base portion 11a22.
  • a line indicated by reference numeral 11a22a represents a boundary between the base portion 11a22 and the distal end portion 11a21.
  • Each of the plurality of teeth 11a2 is radially spaced apart from each other in the circumferential direction D2 of the stator 1.
  • the circumferential direction D2 is equal to the circumferential direction of the stator core 11.
  • a slot 11a3 is formed in a region between adjacent teeth 11a2.
  • the teeth 11a2 include a base portion 11a22 and a tip portion 11a21 extending from the back yoke 11a1 toward the central axis AX.
  • the tip portion 11a21 is formed on the center side of the stator core of the tooth 11a2 in the radial direction D3.
  • a base portion 11a23 is formed between the base portion 11a22 and the tip portion 11a21.
  • the base portion 11a23 is located at a boundary 11a22a between the base portion 11a22 and the distal end portion 11a21.
  • the tip portion 11a21 has a shape extending in the circumferential direction D2.
  • the inner peripheral portion 4 of the tip portion 11a21 faces the rotor 2 shown in FIG.
  • a groove 3 is formed in the inner peripheral portion 4 of the tip portion 11a21.
  • the groove 3 is formed at the central portion in the circumferential direction D2 of the tip portion 11a21.
  • the groove 3 is constituted by the first groove 31 and the second groove 32, and has a shape in which the width in the circumferential direction D2 is gradually reduced toward the outside in the radial direction D3.
  • Each of the first groove 31 and the second groove 32 has a shape that is recessed from the central axis AX shown in FIG. 1 toward the outer peripheral portion 11a11 of the back yoke 11a1.
  • the first groove 31 extends from one end surface of the teeth 11a2 to the other end surface in the axial direction D1 of the central axis AX of the stator core 11.
  • the second groove 32 is formed at the center of the first groove 31 in the circumferential direction D2 and is formed outside the radial direction D3 of the first groove 31.
  • the second groove 32 extends from one end surface of the teeth 11a2 to the other end surface in the axial direction D1 of the central axis AX of the stator core 11.
  • a corner 5 is formed at the tip 11a21.
  • the corner portion 5 is formed between the inner peripheral portion 4 of the distal end portion 11 a 21 and the first groove 31.
  • the width in the circumferential direction D2 of the first groove 31 is W1
  • the width in the circumferential direction D2 of the base portion 11a22 of the teeth 11a2 is W2
  • the width in the circumferential direction D2 of the second groove 32 is W3.
  • the width W1 is narrower than the width W2 and wider than the width W3.
  • the width W4 is Narrower than W5.
  • the width W4 is equal to the maximum depth of the groove 3.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22. That is, the maximum depth of the groove 3 is shallower than the minimum radial thickness of the distal end portion 11a21.
  • the first intersection point IP1 is an intersection point between the bisector CP10 and the virtual curve 11a4.
  • the virtual curve 11a4 is a line obtained by extending the curve of the inner peripheral surface of the tip end portion 11a21 to the groove 3 in a cross section perpendicular to the direction of the central axis AX.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the bottom surface 32a of the groove 3 and the bisector CP10.
  • the width in the circumferential direction D2 of the groove 3 is reduced stepwise toward the outside in the radial direction D3, resulting in a combination of the number of magnetic poles and the number of slots.
  • Both the cogging torque generated and the cogging torque generated due to variations in the magnetic force of the permanent magnet 23 can be reduced.
  • the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 of the first groove 31, and the cogging torque generated due to the variation in the magnetic force of the permanent magnet 23 is the second This is reduced by adjusting the width W3 of the groove 32.
  • the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is 60th order and 120th order when the rotor 2 shown in FIG. Occurs in order.
  • the 60th order is the least common multiple of 10 and 12.
  • cogging torque generated due to variations in the magnetic force of the permanent magnet 23 is generated in orders such as the 12th order and the 24th order when the rotor 2 shown in FIG. .
  • the 12th and 24th orders are integer multiples of the number of slots.
  • the width W1 of the first groove 31 by adjusting the width W1 of the first groove 31, the cogging torque generated in the orders such as the 60th order and the 120th order is reduced.
  • the 12th order cogging torque is reduced by adjusting the width W3.
  • the width of the groove 3 in the circumferential direction D2 is increased.
  • the groove 3 of the stator core piece 11a may be formed in a shape that satisfies the relationship of W1> W3 ⁇ 2.
  • FIG. 4 is a view showing a first modification of the stator core piece shown in FIG.
  • a groove 3A is formed in the teeth 11a2 of the stator core piece 11A shown in FIG. 4 instead of the groove 3 shown in FIG.
  • the groove 3A is formed in the center portion in the circumferential direction D2 of the tip end portion 11a21 in the inner peripheral portion 4 of the tip end portion 11a21.
  • the groove 3 ⁇ / b> A includes a first groove 31, a second groove 32, and a third groove 33.
  • the groove 3A has a shape in which the width in the circumferential direction D2 becomes gradually smaller toward the outside of the radial direction D3, and the width in the circumferential direction D2 changes in three stages.
  • the third groove 33 is formed at the center of the second groove 32 in the circumferential direction D2.
  • the third groove 33 extends from one end surface of the tooth 11a2 to the other end surface in the axial direction D1 of the central axis AX of the stator core 11 shown in FIG.
  • the width W6 is narrower than the width W3.
  • the width W4 is Narrower than width W5.
  • the width W4 is equal to the maximum depth of the groove 3A.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22. That is, the maximum depth of the groove 3A is shallower than the minimum radial thickness of the tip portion 11a21.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the bottom surface 33a of the groove 3A and the bisector CP10.
  • the orders are generated at orders of integer multiples of the number of slots such as 12th order, 24th order and 60th order. And the cogging torque generated at orders other than an integral multiple of the number of slots is reduced.
  • FIG. 5 is a view showing a second modification of the stator core piece shown in FIG.
  • a groove 3B is formed instead of the groove 3 shown in FIG.
  • the groove 3B is formed in the center portion in the circumferential direction D2 of the tip end portion 11a21 in the inner peripheral portion 4 of the tip end portion 11a21.
  • the groove 3B has a shape in which the width in the circumferential direction D2 gradually increases toward the outside in the radial direction D3.
  • the groove 3B has a shape in which the width in the circumferential direction D2 becomes narrower in steps toward the inside of the radial direction D3.
  • the width of the groove 3B in the circumferential direction D2 on the back yoke 11a1 side is W1
  • the width of the base 11a22 of the teeth 11a2 in the circumferential direction D2 is W2
  • the width of the groove 3B in the circumferential direction D2 opposite to the back yoke 11a1 is W3.
  • the width W1 is narrower than the width W2 and wider than the width W3.
  • a corner 5 is formed at the tip 11a21.
  • the corner portion 5 is formed between the inner peripheral portion 4 of the tip portion 11a21 and the groove 3B.
  • W4 width from the bottom surface 3B1 of the groove 3B to the corner portion 5 in the radial direction D3
  • the width W4 is larger than the width W5.
  • the width W4 is equal to the maximum depth of the groove 3B.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22. That is, the maximum depth of the groove 3B is shallower than the minimum radial thickness of the tip portion 11a21.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the bottom surface 3B1 of the groove 3B and the bisector CP10.
  • the orders are generated at orders of integral multiples of the number of slots such as 12th order, 24th order and 60th order. And the cogging torque generated at orders other than an integral multiple of the number of slots is reduced. Further, according to the stator core 11 using the stator core piece 11B, since the width W1 is wider than the width W3, the leakage magnetic flux between the slots is reduced, and a decrease in torque at high load is suppressed. If demonstrating it concretely, in the rotary electric machine 100 at the time of high load, the leakage magnetic flux which flows into the adjacent teeth 11a2 through the front-end
  • the upper slot portion is a portion corresponding to a region closer to the root portion 11a23 than the tip portion 11a21 in the slot 11a3 shown in FIG.
  • FIG. 6 is a view showing a third modification of the stator core piece shown in FIG.
  • a groove group 3C is formed in the tooth 11a2 of the stator core piece 11C shown in FIG. 6 instead of the groove 3 shown in FIG.
  • the groove group 3C is formed at the central portion in the circumferential direction D2 of the tip end portion 11a21 in the inner peripheral portion 4 of the tip end portion 11a21.
  • the groove group 3 ⁇ / b> C includes two first grooves 31 formed on the inner peripheral portion 4 of the tip end portion 11 a 21 and a second groove 32 formed on the inner peripheral portion 4 of the tip end portion 11 a 21.
  • the second groove 32 is provided between the two first grooves 31, and the two first grooves 31 and the second groove 32 are the first groove 31 and the second groove in the circumferential direction D2. 32 and the first groove 31 are arranged in this order.
  • the first groove 31 and the second groove 32 are arranged apart from each other in the circumferential direction D2.
  • a protrusion 41 is formed between the first groove 31 and the second groove 32.
  • a corner 51 is formed between the inner periphery 4 of the tip 11a21 and the first groove 31.
  • a corner portion 52 is formed between the inner peripheral portion 4 of the distal end portion 11 a 21 and the second groove 32.
  • the width from the bottom surface 31a of the first groove 31 to the corner portion 51 in the radial direction D3 is W41
  • the width from the bottom surface 32a of the second groove 32 to the corner portion 52 in the radial direction D3 is W42
  • the width in the radial direction D3 is W4
  • the width W42 is narrower than the width W5 and wider than the width W41.
  • the width W42 is equal to the maximum depth of the second groove 32.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22. That is, the maximum depth of the second groove 32 is shallower than the minimum radial thickness of the tip end portion 11a21.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the bottom surface 32a of the second groove 32 and the bisector CP10.
  • the width from one corner 51 in the circumferential direction D2 to the other corner 51 is W1
  • the width in the circumferential direction D2 of the first groove 31 is W11
  • the width in the circumferential direction D2 of the base 11a22 of the tooth 11a2 is W2.
  • the width W1 is narrower than the width W2
  • the width W11 is narrower than the width W2 and wider than the width W3.
  • the groove group 3 ⁇ / b> C has a shape in which the width in the circumferential direction D ⁇ b> 2 gradually decreases toward the outer side in the radial direction D ⁇ b> 3, similarly to the groove 3 illustrated in FIG. 3.
  • the stator core 11 using the stator core piece 11C shown in FIG. 6 the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W11 of the first groove 31.
  • the width W3 of the second groove 32 By adjusting the width W3 of the second groove 32, the cogging torque generated due to the variation in the magnetic force of the permanent magnet 23 is reduced.
  • the shape of the first groove 31 and the second groove 32 is not a simple shape such as a circle and a rectangle, but a complicated shape such as a star shape and a V shape, the shape of a die for punching the magnetic steel sheet base material is In some cases, it becomes complicated and it becomes difficult to manufacture a metal mold and it is difficult to punch the base material of the electromagnetic steel sheet.
  • FIG. 7 is a view showing a fourth modification of the stator core piece shown in FIG.
  • a through hole 6 is formed in the tooth 11a2 of the stator core piece 11D shown in FIG. 7 instead of the groove 3 shown in FIG.
  • the through hole 6 is formed at the center of the distal end portion 11a21 in the circumferential direction D2.
  • the through hole 6 penetrates the one end surface and the other end surface of the tooth 11a2 in the axial direction D1 shown in FIG.
  • the through hole 6 includes a first region 6a having a width W1 in the circumferential direction D2 that is narrower than the width W2 of the base portion 11a22, and a second region 6b having a width W3 in the circumferential direction D2 that is narrower than the width W1.
  • the second region 6b communicates with the first region 6a and is formed at the center of the first region 6a in the circumferential direction D2.
  • the second region 6b is formed closer to the base 11a22 than the first region 6a.
  • the width from the end surface 6d of the second region 6b in the radial direction D3 to the end surface 6c of the first region 6a in the radial direction D3 on the side opposite to the teeth 11a2 is W4, and from the root 11a23 in the radial direction D3 to the first.
  • W5 width to the intersection IP1
  • W5 width to the intersection IP1
  • W5 width to the width W4
  • the width W4 is equal to the maximum depth of the through hole 6 that extends radially outward from the inner peripheral portion 4 of the distal end portion 11a21.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22. That is, the maximum depth of the through hole 6 is shallower than the minimum radial thickness of the tip end portion 11a21.
  • the first intersection point IP1 is an intersection point between the bisector CP10 and the inner peripheral surface of the tip end portion 11a21.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the radially outer end face of the through hole 6 and the bisector CP10.
  • the through-hole 6 has a shape in which the width in the circumferential direction D2 is gradually reduced toward the outside in the radial direction D3.
  • the cogging torque caused by the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 of the first region 6a.
  • the cogging torque generated due to the variation in the magnetic force of the permanent magnet 23 is reduced by adjusting the width W3 of the second region 6b.
  • the stator core 11 using the stator core piece 11D shown in FIG. 7 since only one through hole 6 has to be formed without providing a plurality of through holes in one tooth 11a2, it depends on the mold. Punching becomes easy.
  • the grooves 3, 3A, 3B and the groove group 3C shown in FIGS. 3 to 6 are not provided, so the grooves 3, 3A, 3B are not provided.
  • the roundness of the stator inner diameter caused by the manufacturing variation of the through-hole 6 does not decrease, and the roundness of the stator core 11 is improved. Play.
  • FIG. 8 is a view showing a fifth modification of the stator core piece shown in FIG. A through hole group 6A is formed in the tooth 11a2 of the stator core piece 11E shown in FIG. 8 instead of the groove 3 shown in FIG. 6 A of through-hole groups are formed in the center part in the circumferential direction D2 of the front-end
  • the through-hole group 6 ⁇ / b> A includes two first through-holes 61 and a second through-hole 62.
  • the second through hole 62 is provided between the two first through holes 61, and the two first through holes 61 and the second through holes 62 are the first through holes 61 in the circumferential direction D ⁇ b> 2.
  • the second through hole 62 and the first through hole 61 are arranged in this order.
  • the first through hole 61 and the second through hole 62 are arranged to be separated from each other in the circumferential direction D2.
  • the position of the end surface of the first through hole 61 opposite to the back yoke 11a1 in the radial direction D3 is the portion closest to the second through hole 62, and the second through hole 62 in the radial direction D3. This is the same as the position of the end surface opposite to the back yoke 11a1.
  • the width from the end face on the back yoke 11a1 side of the first through hole 61 in the radial direction D3 to the end face on the opposite side of the back yoke 11a1 of the first through hole 61 in the radial direction D3 is W41, and in the radial direction D3
  • the width from the end face on the back yoke 11a1 side of the second through hole 62 to the end face on the opposite side of the back yoke 11a1 of the second through hole 62 in the radial direction D3 is W42, and from the root part 11a23 in the radial direction D3.
  • the width W42 is equal to the maximum depth of the second through hole 62 that extends radially outward from the inner peripheral portion 4 of the distal end portion 11a21.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22. That is, the maximum depth of the second through hole 62 is shallower than the minimum radial thickness of the tip end portion 11a21.
  • the first intersection point IP1 is an intersection point between the bisector CP10 and the inner peripheral surface of the tip end portion 11a21.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the radially outer end face of the second through hole 62 and the bisector CP10.
  • the width from one end surface of one first through hole 61 in the circumferential direction D2 to the other end surface of the other first through hole 61 in the circumferential direction D2 is W1, and the first through hole 61 in the circumferential direction D2 is defined as W1.
  • W11 the width in the circumferential direction D2 of the base portion 11a22 of the tooth 11a2 is W2
  • the width in the circumferential direction D2 of the second through hole 62 is W3
  • the width W1 is narrower than the width W2 and the width W11. Is narrower than the width W2 and wider than the width W3.
  • the through-hole group 6A has a shape in which the width in the circumferential direction D2 is gradually reduced toward the outside in the radial direction D3.
  • the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is adjusted by adjusting the width W11 of the first through hole 61.
  • the cogging torque that is reduced and caused by the variation in the magnetic force of the permanent magnet 23 is reduced by adjusting the width W ⁇ b> 3 of the second through hole 62.
  • stator core 11 using the stator core piece 11E similarly to the first groove 31 and second groove 32 shown in FIG. Since the shape of the second through hole 62 can be a simple rectangle, the mold can be easily manufactured, and the stator core 11 can be easily manufactured. Further, in the stator core 11 using the stator core piece 11E shown in FIG. 8, since the grooves 3, 3A, 3B and the groove group 3C shown in FIGS. 3 to 6 are not provided, the grooves 3, 3A, 3B are not provided. Compared with the case where the groove group 3C is provided, the roundness of the stator inner diameter due to the manufacturing variation of the through-hole group 6A does not decrease, and the roundness of the stator core 11 is improved. There is an effect.
  • FIG. 9 is a view showing a sixth modification of the stator core piece shown in FIG.
  • a through hole group 6B is formed in the tooth 11a2 of the stator core piece 11F shown in FIG. 9 instead of the groove 3 shown in FIG.
  • the through-hole group 6B is formed at the center portion in the circumferential direction D2 of the tip portion 11a21.
  • the through-hole group 6B includes a first through-hole 61 and a second through-hole 62 that are arranged in the radial direction D3.
  • the first through hole 61 and the second through hole 62 are arranged to be separated from each other in the radial direction D3.
  • the first through hole 61 is provided closer to the inner peripheral portion 4 of the tip end portion 11a21, and the second through hole 62 is provided on the back yoke 11a1 side of the first through hole 61 and the first through hole. 61 is provided at the center in the circumferential direction D2.
  • the width from the end face on the back yoke 11a1 side of the second through hole 62 in the radial direction D3 to the end face on the opposite side of the back yoke 11a1 of the first through hole 61 in the radial direction D3 is W4, and in the radial direction D3.
  • W5 When the width from the base portion 11a23 to the first intersection point IP1 is W5, the width W4 is narrower than the width W5.
  • the width W4 is equal to the maximum width from the inside in the radial direction of the first through hole 61 to the outside in the radial direction of the second through hole 62.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22. That is, the maximum width from the inside in the radial direction of the first through hole 61 to the outside in the radial direction of the second through hole 62 is narrower than the minimum thickness in the radial direction of the tip end portion 11a21.
  • the first intersection point IP1 is an intersection point between the bisector CP10 and the inner peripheral surface of the tip end portion 11a21.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the radially outer end face of the second through hole 62 and the bisector CP10.
  • the width in the circumferential direction D2 of the first through hole 61 is W1
  • the width in the circumferential direction D2 of the base portion 11a22 of the teeth 11a2 is W2
  • the width in the circumferential direction D2 of the second through hole 62 is W3
  • the width W1 is narrower than the width W2 and wider than the width W3.
  • the through-hole group 6B has a shape in which the width in the circumferential direction D2 is gradually reduced toward the outside in the radial direction D3.
  • the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is adjusted by adjusting the width W1 of the first through hole 61.
  • the cogging torque that is reduced and caused by the variation in the magnetic force of the permanent magnet 23 is reduced by adjusting the width W ⁇ b> 3 of the second through hole 62.
  • the stator core 11 using the stator core piece 11F similarly to the first groove 31 and the second groove 32 shown in FIG.
  • the stator core 11 can be easily manufactured.
  • the stator core piece 11E shown in FIG. 8 has three through holes provided in the teeth 11a2
  • the stator core piece 11F shown in FIG. 9 has two through holes provided in the teeth 11a2. Therefore, the number of through holes can be reduced. Therefore, the stator core 11 using the stator core piece 11F shown in FIG.
  • FIG. 10 is a view showing a seventh modification of the stator core piece shown in FIG. A tooth 3a and a through hole 6C are formed in the teeth 11a2 of the stator core piece 11G shown in FIG. 10 instead of the groove 3 shown in FIG.
  • the groove 3D is formed in the center portion in the circumferential direction D2 of the tip end portion 11a21 in the inner peripheral portion 4 of the tip end portion 11a21.
  • 6 C of through-holes are formed in the center part in the circumferential direction D2 of the front-end
  • the through hole 6C is formed on the back yoke 11a1 side of the groove 3D in the radial direction D3.
  • a corner 5 is formed at the tip 11a21.
  • the corner portion 5 is formed between the inner peripheral portion 4 of the tip end portion 11a21 and the groove 3D.
  • the width W4 is , Narrower than width W5.
  • the width W4 is equal to the maximum width from the corner portion 5 between the inner peripheral surface of the tip end portion 11a21 and the groove 3D to the outside in the radial direction of the through hole 6C.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22.
  • the first intersection point IP1 is an intersection point between the bisector CP10 and the virtual curve 11a4.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the radially outer end face of the through hole 6C and the bisector CP10.
  • width in the circumferential direction D2 of the groove 3D is W1
  • width in the circumferential direction D2 of the base portion 11a22 of the teeth 11a2 is W2
  • the width in the circumferential direction D2 of the through hole 6C is W3
  • the width W1 is larger than the width W2. Narrow and wider than width W3.
  • the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 of the groove 3D.
  • the width W ⁇ b> 3 of the hole 6 ⁇ / b> C the cogging torque generated due to the variation in the magnetic force of the permanent magnet 23 is reduced.
  • the shape of the through-hole 6C and the groove 3D can be made a simple rectangle, like the first groove 31 and the second groove 32 shown in FIG. Therefore, the mold can be easily manufactured, and the stator core 11 can be easily manufactured.
  • the gap WD density is reduced by making the width W1 of the groove 3D larger than the width W3 of the through hole 6C, thereby minimizing torque reduction. To the limit.
  • FIG. 11 is a view showing an eighth modification of the stator core piece shown in FIG.
  • two grooves 3E and through holes 6D are formed instead of the grooves 3 shown in FIG.
  • the two grooves 3E and the through-hole 6D are formed in the center portion in the circumferential direction D2 of the tip end portion 11a21 in the inner peripheral portion 4 of the tip end portion 11a21.
  • the through hole 6D is provided between the two grooves 3E, and the two grooves 3E and the through hole 6D are arranged in the order of the groove 3E, the through hole 6D, and the groove 3E in the circumferential direction D2.
  • a corner portion 5 is formed between the inner peripheral portion 4 of the tip portion 11a21 and the groove 3E.
  • the width from the end face on the back yoke 11a1 side of the through hole 6D in the radial direction D3 to the corner portion 5 is W41
  • the width from the bottom surface 3E1 to the corner portion 5 of the groove 3E in the radial direction D3 is W42
  • the width W4 is equal to the maximum width from the corner portion 5 between the inner peripheral surface of the tip end portion 11a21 and the groove 3E to the radially outer side of the through hole 6D.
  • the width W5 is equal to the minimum radial thickness of the distal end portion 11a21 from the inner peripheral portion 4 of the distal end portion 11a21 to the boundary 11a22a between the distal end portion 11a21 and the base portion 11a22.
  • the first intersection point IP1 is an intersection point between the bisector CP10 and the inner peripheral surface of the tip end portion 11a21.
  • the radial width from the first intersection point IP1 to the second intersection point IP2 between the boundary 11a22a and the bisector CP10 is defined as the first width (W5), and the first intersection point IP1 to the third intersection point.
  • the radial width up to IP3 is the second width (W4), the second width is narrower than the first width.
  • the third intersection point IP3 is an intersection point between the radially outer end face of the through hole 6D and the bisector CP10.
  • the width from one end surface of one groove 3E in the circumferential direction D2 to the other end surface of the other groove 3E in the circumferential direction D2 is W1
  • the width in the circumferential direction D2 of the groove 3E is W11
  • the circumference of the base portion 11a22 of the teeth 11a2 When the width in the direction D2 is W2 and the width of the through hole 6D in the circumferential direction D2 is W3, the width W1 is narrower than the width W2, and the width W3 is narrower than the width W1 and equal to the width W11.
  • the cogging torque caused by the combination of the number of magnetic poles and the number of slots is reduced by adjusting the width W1 including the two grooves 3E.
  • the width W3 of the through hole 6D By adjusting the width W3 of the through hole 6D, the cogging torque generated due to the variation in the magnetic force of the permanent magnet 23 is reduced.
  • the shapes of the through holes 6D and the grooves 3E can be made into a simple rectangle, similarly to the first groove 31 and the second groove 32 shown in FIG. Therefore, the mold can be easily manufactured, and the stator core 11 can be easily manufactured.
  • the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is further reduced by providing the plurality of grooves 3E.
  • FIG. FIG. 12 is a perspective view of a stator core according to the second embodiment.
  • the stator core 1A includes a plurality of stator core pieces 11J instead of the plurality of stator core pieces 11a shown in FIG.
  • Grooves 3 shown in FIG. 3 are formed at a plurality of locations in the tip 11a21 of the teeth 11a2 of the stator core piece 11J.
  • Each of the plurality of grooves 3 is arranged to be separated from each other in the axial direction D1.
  • the stator core piece 11J includes a first steel plate group 7a constituted by a plurality of thin plates in which the grooves 3 are formed, and a second steel plate group 7b constituted by a plurality of thin plates in which the grooves are not formed.
  • the layers are alternately stacked in the axial direction D1.
  • the first groove 31 and the second groove shown in FIG. 3 are reversed so that the phases of the cogging torque generated in the first steel plate group 7a and the cogging torque generated in the second steel plate group 7b are reversed.
  • the width of each groove 32 in the circumferential direction D2 is adjusted.
  • the phase and amplitude of the cogging torque generated due to the combination of the number of magnetic poles and the number of slots is adjusted by the width W1 of the first groove 31, and the phase and amplitude of the cogging torque generated due to the variation in the magnetic force of the permanent magnet 23. Is adjusted by the width W3 of the second groove 32.
  • the amplitude of the cogging torque whose phase is reversed in each tooth is adjusted, and the cogging torque generated in each tooth is adjusted. Addition reduces the cogging torque of the entire stator.
  • the groove 3 is partially formed in the distal end portion 11a21, so that the gap magnetic flux density is higher than that in the case where the groove 3 is formed from one end to the other end in the axial direction D1 of the distal end portion 11a21. The effect is that the decrease is suppressed and the torque is improved.
  • three grooves 3 are formed from one end to the other end of the tip end portion 11a21 in the axial direction D1, but the number of grooves 3 is limited to the illustrated example as long as the number is three or more. is not.
  • the example in which the groove 3 is formed has been described.
  • the groove shown in FIGS. 4 to 6 or the through hole shown in FIGS. The same effect can be obtained even when two or more tip portions 11a21 in the direction D1 are formed from one end to the other end.
  • the example in which the groove 3 is formed has been described.
  • the set of the groove and the through-hole shown in FIG. 10 or 11 is replaced with one end of the tip end portion 11a21 in the axial direction D1. Even when two or more are formed from the first to the other end, the same effect can be obtained.
  • the grooves or the through holes described in the first and second embodiments are linear. The same effect can be obtained when applied to a stator of a motor.
  • the groove or the through hole is formed at the center portion in the circumferential direction D2 of the tooth tip portion, but the groove or the through hole is located at a position near the end portion in the circumferential direction D2 of the tooth tip portion. Even if it is formed, the same effect can be obtained as long as the width of the groove or the through hole in the circumferential direction D2 is gradually narrowed toward the outside or the inside of the radial direction D3.
  • the groove or the through hole is formed symmetrically in the circumferential direction D2 with respect to the center portion in the circumferential direction D2 of the tooth tip, but the width of the groove or the through hole in the circumferential direction D2 is The same effect can be obtained even if the shape is asymmetrical as long as the shape becomes narrower stepwise toward the outside or inside of the radial direction D3.
  • stator core configured by connecting a plurality of stator core pieces in a ring shape
  • stator core configured by a plurality of stator core pieces
  • a stator core formed by stacking the stator core pieces punched out into a joint, a joint wrap core in which a part of the stator core is connected, a joint wrap core in which the stator core partially overlaps
  • the groove or the through-hole having a shape in which the width in the circumferential direction D2 of the groove or the through-hole is gradually reduced toward the outside or the inside in the radial direction D3.
  • FIG. 13 is a first diagram showing the relationship between the cogging torque generated in the rotor according to the first and second embodiments and the groove width.
  • the vertical axis in FIG. 13 represents the cogging torque T1 caused by the variation in the magnetic force of the magnet
  • the horizontal axis in FIG. 13 represents the ratio of the width W3 of the second groove 32 shown in FIG. It is represented by.
  • FIG. 14 is a second diagram showing the relationship between the cogging torque generated in the rotor according to the first and second embodiments and the groove width.
  • the vertical axis in FIG. 14 represents the cogging torque T2 generated due to the combination of the number of magnetic poles and the number of slots
  • the horizontal axis in FIG. 14 represents the width W1 of the first groove 31 shown in FIG. Is expressed as a ratio.
  • the permeance distribution of the gap changes, and the amplitude and phase of cogging torque caused by the permeance change.
  • the slope of the cogging torque changes when the width W1 of the first groove 31 is 0.4 [p.u] to 0.7 [p.u].
  • the relationship between the cogging torque and the groove width is considered, and the width of the groove or the through hole is set.
  • the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
  • stator 1 stator, 2 rotor, 3, 3A, 3B, 3D, 3E groove, 3B1, 3E1, 31a, 32a, 33a bottom surface, 3C groove group, 4, inner periphery, 5, 51, 52 corner, 6, 6C , 6D through-hole, 6A, 6B through-hole group, 6a first region, 6b second region, 6c, 6d end face, 7a first steel plate group, 7b second steel plate group, 8-wire, 11 stator core 11a, 11A, 11B, 11C, 11D, 11E, 11F, 11G, 11H, 11J Stator core piece, 11a1 back yoke, 11a1a inner peripheral side, 11a22a boundary, 11a11 outer peripheral part, 11a111 peripheral direction center, 11a2 teeth, 11a21 Tip, 11a22 base, 11a23 root, 11a3 slot, 11a4 virtual curve, 12 windings, 21 rotor core , 22 shaft, 23 permanent magnet, 24 magnetic pole, 31 first groove, 32 second groove

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne : une pluralité de pièces centrales de stator (11a) constituant une partie centrale de stator annulaire conçues à partir d'une culasse arrière (11a1) et des dents (11a2) disposées sur le côté périphérique interne de la culasse arrière (11a1) ; les dents (11a2) sont dotées d'une section base (11a22) s'étendant entre le centre périphérique de la culasse arrière (11a1) dans la direction vers un axe central, et une section pointe (11a21) disposée sur le côté périphérique interne de la section base (11a22) ; sur une section périphérique interne de la section pointe (11a21), une rainure (3) est formée pour avoir une forme dans laquelle la largeur circonférentielle de celle-ci change en étages vers l'extérieur dans une direction radiale de la partie centrale de stator ; et lorsque la largeur dans la direction de vecteur de rayon entre un premier point d'intersection (IP1) et un deuxième point d'intersection (IP2) est une première largeur, et que la largeur dans la direction de vecteur de rayon entre le premier point d'intersection (IP1) et un troisième point d'intersection (IP3) est une seconde largeur, la seconde largeur est plus étroite que la première largeur.
PCT/JP2017/014241 2017-04-05 2017-04-05 Pièce centrale de stator et machine électrique rotative WO2018185879A1 (fr)

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CN201780074495.4A CN110036552B (zh) 2017-04-05 2017-04-05 定子芯构成片及旋转电机
PCT/JP2017/014241 WO2018185879A1 (fr) 2017-04-05 2017-04-05 Pièce centrale de stator et machine électrique rotative
KR1020197015172A KR102077593B1 (ko) 2017-04-05 2017-04-05 고정자 코어편 및 회전 전기 기기
JP2017555730A JP6309178B1 (ja) 2017-04-05 2017-04-05 固定子コア片及び回転電機
TW107105772A TWI672891B (zh) 2017-04-05 2018-02-21 定子芯片及旋轉電機

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WO2021052688A1 (fr) * 2019-09-16 2021-03-25 Magna powertrain gmbh & co kg Machine électrique pour véhicule automobile
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CN113364157B (zh) * 2021-06-11 2024-08-23 珠海格力节能环保制冷技术研究中心有限公司 定子铁芯组件、定子组件和电机
CN115021434B (zh) * 2022-06-09 2025-08-15 珠海格力电器股份有限公司 定子铁芯、电机、汽车

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CN110036552A (zh) 2019-07-19
JPWO2018185879A1 (ja) 2019-04-11
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TWI672891B (zh) 2019-09-21
CN110036552B (zh) 2020-09-22

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