CN115811157B - Rotor and electric water pump using same - Google Patents
Rotor and electric water pump using same Download PDFInfo
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- CN115811157B CN115811157B CN202111065570.5A CN202111065570A CN115811157B CN 115811157 B CN115811157 B CN 115811157B CN 202111065570 A CN202111065570 A CN 202111065570A CN 115811157 B CN115811157 B CN 115811157B
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- rotor
- permanent magnet
- outer circular
- phi
- arc
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000002955 isolation Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000010349 pulsation Effects 0.000 abstract description 5
- 230000004907 flux Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a rotor and an electric water pump using the rotor, comprising a rotor core and a permanent magnet, wherein the circumferential profile of the rotor core is formed by connecting an even number of outer circular arcs end to end, permanent magnet grooves corresponding to the outer circular arcs are axially extended, the permanent magnet is arranged in the permanent magnet grooves, in an axial projection view, the outer diameter of an circumscribed circle of the circumferential profile of the rotor core is phi, the radius of the outer circular arc is R1, the distance between the circle center k1 of the outer circular arc and the circle center k of the circumscribed circle of the circumferential profile is a, and the width of the side of the permanent magnet, which is opposite to the outer circular arc, is w, so that phi= (a+R1) is satisfied; a= (0.14-0.17) ×phi and/or w= (0.46-0.48) ×phi. The rotor improves the magnetic property of the rotor through optimizing the external contour and the size of the permanent magnet, reduces the torque pulsation when the rotor runs, and reduces the vibration when the rotor equipment is used.
Description
Technical Field
The invention relates to a rotor, in particular to an electric water pump applying the rotor, and the IPC of the electric water pump is F04D13/06.
Background
The existing rotor generally consists of a rotor core and permanent magnets, wherein permanent magnet grooves are formed in the axial end face of the rotor core, and the permanent magnets are assembled in the permanent magnet grooves. The design of rotor core's outline and permanent magnet groove is great to the vibrations and magnetic property and mechanical strength's during rotor operation influence, and the too big width that separates the magnetic bridge that forms of permanent magnet groove and pivot core's outer peripheral face can cause the magnetic leakage moreover, and the too little intensity that influences the rotor that breaks of width easily does not have better solution at present.
Disclosure of Invention
In order to solve the problems, the invention provides the following technical scheme:
the rotor comprises a rotor core and permanent magnets, wherein the circumferential profile of the rotor core is formed by connecting an even number of outer circular arcs end to end, permanent magnet grooves corresponding to the outer circular arcs are formed in an extending mode along the axial direction, the permanent magnets are installed in the permanent magnet grooves, the diameter of an circumscribed circle of the circumferential profile of the rotor core is phi, the radius of the outer circular arc is R1, the distance between the circle center k1 of the outer circular arc and the circle center k of the circumscribed circle of the circumferential profile is a, and the width of the side, facing the outer circular arcs, of the permanent magnets is w, so that phi= (a+R1) x 2 is met; a= (0.14-0.17) ×phi and/or w= (0.46-0.48) ×phi.
According to the invention, the outer contour of the rotor and the size of the permanent magnet are optimized, so that the torque pulsation of the rotor during operation is reduced, and the vibration generated by the rotor during operation is reduced.
Further, in an axial projection view of the rotor, the permanent magnet slots are symmetrical about a line connecting a center k1 of the outer circular arc and a center k of an circumscribed circle of the circumferential profile of the rotor core; the permanent magnet groove comprises an upper groove surface and a lower groove surface which are perpendicular to the connecting line and a side surface which connects the upper groove surface and the lower groove surface, and the side surface is provided with an arc-shaped section concentric with the outer arc. According to the rotor with the design, the arc sections concentric with the outer arc are arranged on the side faces of the permanent magnet grooves, the width between the side faces of the permanent magnet grooves and the outer arc face is reduced, the permanent magnet grooves and the outer arc face are evenly transited, the magnetic flux saturation of the area between the side faces of the permanent magnet grooves and the outer arc face is improved, the magnetic leakage is reduced, meanwhile, cracking caused by insufficient width and uneven stress between the side faces of the permanent magnet grooves and the outer arc face can be avoided, and the mechanical performance of the rotor is improved.
Further, the side surface further comprises a first side surface connecting the arc section and the lower groove surface; the center of the circumscribed circle is connected with the intersection point of two adjacent outer arcs to form a straight line q, and the first side surfaces of two adjacent permanent magnet grooves are symmetrical about the straight line q. This design ensures symmetry of the magnetic circuit.
Further, the rotor core is provided with a shaft hole for the shaft to pass through, the peripheral wall of the shaft hole axially extends to have the same number as the outer circular arcs, and the axial projection is a partial circular splitter box, and in the axial projection view of the rotor, the centers of the outer circular arcs, the splitter boxes and the shaft hole are positioned on the same straight line. The arrangement of the shunt grooves changes the direction of magnetic force lines, shortens the path length of the magnetic force lines and improves the magnetic performance.
Furthermore, a magnetic isolation bridge is formed in the area between the arc section and the outer arc, the value range of the width L of the magnetic isolation bridge is 0.5-1 mm, the interval L1 between two opposite first side surfaces of the adjacent shunt grooves is formed, and the value range of the L1 is 0.6-1.2 mm. The magnetic flux of the area between the side surface of the permanent magnet groove and the outer arc surface is improved by optimizing the width of the magnetic isolation bridge and the interval width of the groove body, and meanwhile, the problem of mechanical strength of cracking caused by insufficient width and uneven stress between the side surface of the permanent magnet groove and the outer arc surface is avoided.
Further, the diameters of the even number of outer arcs are equal. The magnetic flux balance of each pole can be maintained.
Further, the cross section of the axial projection of the permanent magnet is rectangular. Permanent magnet material can be saved.
The invention also provides an electric water pump, which comprises a pump part and a motor, wherein the motor comprises a stator and any one of the rotors.
Further, the number of outer arcs is 2p, where p is the pole pair number of the motor.
According to the electric water pump, through optimizing the structure of the rotor, cogging torque and torque pulsation are reduced, and the effect of reducing vibration of the electric water pump during operation is achieved.
Drawings
FIG. 1 is a radial cross-sectional view of a rotor of the present invention;
FIG. 2 is an enlarged schematic view of a portion of FIG. 1A;
FIG. 3 is an axial projection schematic view of a stator core;
FIG. 4 is an enlarged partial schematic view of B in FIG. 3;
FIG. 5 is an axial cross-sectional view of an electric water pump employing a rotor of the present invention;
Fig. 6 is a graph of a ratio of an outer diameter of an circumscribed circle of a circumferential profile of a rotor core to a distance between a center of an outer circular arc and a center of the circumscribed circle of the circumferential profile of the rotor core versus torque ripple;
Fig. 7 is a graph showing a ratio of an outer diameter of an circumscribed circle of a circumferential contour of a rotor core to a width of a side of a permanent magnet facing an outer circular arc, versus torque ripple;
Wherein: 1-pump section, 2-motor, 10-rotor, 20-spindle, 30-impeller, 40-stator, 50-housing, 51-stator cavity, 52-rotor cavity, 60-pump cover, 100-rotor core, 110-outer arc, 120-permanent magnet slot, 121-upper slot face, 122-lower slot face, 123-side face, 124-arc segment, 125-first side face, 130-shaft hole, 131-shunt slot, 200-permanent magnet, 210-magnetic force line
Detailed Description
Referring to fig. 1, the present invention provides a rotor 10 that reduces operational vibrations, improves magnetic properties, and maintains mechanical strength. The rotor 10 includes a rotor core 100 and permanent magnets 200, the rotor core 100 is columnar, and the circumferential profile thereof is formed by connecting an even number of outer arcs 110 end to end. The rotor core 100 is provided with permanent magnet slots 120 corresponding to the outer arcs 110 extending in the axial direction, and permanent magnets 200 are mounted in the permanent magnet slots 120. Referring to fig. 1 and 3, in an axial projection view of the rotor, a diameter of an circumscribed circle of a circumference Xiang Lunkuo of the rotor core 100 is Φ, a radius of the outer arc 110 is R1, a distance between a center k1 of the outer arc and a center k of the circumscribed circle of the circumferential profile is a, and a width of a side of the permanent magnet 200 facing the outer arc 110 is w. Referring to fig. 6 and 7, the optimization design of the outline size of the rotor and the calculation by using simulation software show that when phi= (a+r1) x 2, a= (0.14-0.17) x phi is satisfied, or w= (0.46-0.48) x phi is satisfied, or the conditions of a= (0.14-0.17) x phi and w= (0.46-0.48) x phi are satisfied at the same time, the motor torque pulsation of the rotor is applied to be in a low position and distributed more uniformly, so that the vibration generated during the operation of the motor is reduced.
Referring to fig. 3 and 4, in an axial projection view of the rotor, the permanent magnet slots 120 are symmetrical about a line d connecting a center k1 of the outer circular arc 110 and a center k of an circumscribed circle of a circumferential profile of the rotor core 100. Further, the permanent magnet slot 120 includes an upper slot face 121 and a lower slot face 122 perpendicular to the connection line d and a side face 123 connecting the upper slot face 121 and the lower slot face 122, the side face 123 having an arc-shaped section 124 concentric with the outer arc 110. In order to improve the smoothness of the rotor when it rotates, the outer arcs 110 of the rotor are preferably all equal in diameter.
According to the rotor, the arc-shaped sections concentric with the outer arc are arranged on the side surfaces of the permanent magnet grooves of the rotor core, the width between the side surfaces of the permanent magnet grooves and the outer arc surface is reduced, the permanent magnet grooves and the outer arc surface are in uniform transition, the magnetic flux saturation of the area between the side surfaces of the permanent magnet grooves and the outer arc surface is improved, the magnetic leakage is reduced, meanwhile, the cracking caused by insufficient width and uneven stress between the side surfaces of the permanent magnet grooves and the outer arc surface can be avoided, and the mechanical property of the rotor is improved.
Aiming at the structure that the outer contour deviates from the circle center, the expression of the cogging torque can be deduced according to the cogging torque of the permanent magnet motor as follows:
Wherein z is the number of armature slots, mu 0 is vacuum magnetic permeability, L a is the axial length of the stator core, R 1 and R 2 are respectively the outer radius of the stator core and the inner radius of the stator, and n is an integer which enables nz/2p to be an integer; g n is a function of slot width θ s0 and B r is permanent magnet remanence.
As can be seen from the above cogging torque expression, the cogging torque is periodically varied, and the slot width θ s0 is constant, and G n is also a constant value, thus the amplitudeThe smaller the cogging torque, the smaller the torque ripple.
Referring to fig. 3, the side surface 123 of the permanent magnet slot of the rotor core 100 of the present invention further includes a first side surface 125 connecting the arc-shaped section 124 and the lower slot surface 122, and the center k of the circumscribed circle is connected with the intersection point of two adjacent outer arcs to form a straight line q. Referring to fig. 4, two opposing first sides 125 of adjacent permanent magnet slots are symmetrical about a straight line q. This design ensures symmetry of the magnetic circuit.
Referring to fig. 1 and 2, an axial shaft hole 130 through which a rotating shaft passes is provided in the axial direction of the rotor core 100, the peripheral wall of the shaft hole 130 extends in the axial direction to form a partial circular splitter box 131, and in the axial projection view of the rotor, the line between the center k1 of the outer circular arc, the center k2 of the splitter box and the center k3 of the shaft hole is on the same straight line. Preferably, the center k3 of the shaft hole coincides with the center k of the circumferential profile circumscribed circle. The arrangement of the shunt grooves changes the direction of magnetic force lines, shortens the path length of the magnetic force lines and improves the magnetic performance.
As shown in fig. 3 and 4, the region between the arc-shaped section 124 and the outer arc 110 of the rotor core of the present invention forms a magnetic gap bridge having a width L, and a slot space is formed between the opposite first sides 125 of the adjacent permanent magnet slots 120 by a distance L1. Preferably, the width L of the magnetic isolation bridge is 0.5mm to 1mm, and the distance L1 between the grooves is 0.6mm to 1.2 mm. Preferably, the width L of the magnetic isolation bridge is 0.8mm, and the distance L1 between the groove bodies is 1mm. The design reduces the width of the magnetism isolating bridge while ensuring the rotor to have enough mechanical strength, improves the saturation of magnetic flux of the rotor core at the position and reduces magnetic leakage.
As shown in fig. 1, in order to reduce the amount of permanent magnets while ensuring the magnetic properties of the rotor, the axially projected cross section of the permanent magnet 200 of the present invention is preferably rectangular.
Referring to fig. 5, the present invention also provides an electric water pump comprising a pump part 1 and a power-driven motor 2, wherein the motor 2 comprises the above-mentioned rotor 10, a rotary shaft 20 mounted in a rotor shaft hole 130, a stator 40, and a casing 50, the casing 50 being provided with a stator cavity 51 accommodating the stator 40 and a rotor cavity 52 accommodating the rotor 10; the pump part 1 comprises a pump cover 60 and an impeller 30 which is positioned in a cavity enclosed by the casing 50 and the pump cover 60 and driven by the rotor 10; when the electric pump is operated, the rotor 10 rotates under the magnetic field of the stator 40. Further, the number of outer arcs 110 of the rotor 10 of the motor is 2p, where p is the pole pair number of the motor.
In a specific embodiment, the motor has a rotor outer diameter Φ=30.5 mm, a=5 mm, r1=10.25, w=14.1 mm, and an inner diameter of the stator core is 35mm, and parameters obtained by calculation using simulation software are compared as follows.
According to the electric water pump, the structure of the rotor is optimized through simulation operation, so that cogging torque and torque pulsation are reduced, and the effect of reducing vibration of the electric water pump during operation is achieved.
The present invention is not limited to the above-described embodiments, but, if various modifications or variations of the present invention are not departing from the spirit and scope of the present invention, the present invention is intended to include such modifications and variations as fall within the scope of the claims and the equivalents thereof.
Claims (8)
1. A rotor comprising a rotor core (100) and permanent magnets (200), characterized in that: the circumferential profile of the rotor core (100) is formed by connecting an even number of outer circular arcs (110) end to end, permanent magnet grooves (120) corresponding to the outer circular arcs (110) are formed in an extending mode along the axial direction, the permanent magnets (200) are installed in the permanent magnet grooves (120), the diameter of an circumscribed circle of the circumferential profile of the rotor core (100) is phi in an axial projection view, the radius of the outer circular arcs (110) is R1, the distance between the circle center k1 of the outer circular arcs and the circle center k of the circumscribed circle of the circumferential profile is a, and the width of a side, facing the outer circular arcs (110), of the permanent magnets (200) is w, so that phi= (a+R1) is satisfied; a= (0.14-0.17) = phi and w= (0.46-0.48) = phi, in an axial projection view of the rotor, the permanent magnet slots (120) are symmetrical with respect to a line connecting a center k1 of the outer arc (110) and a center k of an circumscribed circle of a circumferential contour of the rotor core (100); the permanent magnet slot (120) comprises an upper slot face (121) and a lower slot face (122) perpendicular to the connecting line and a side face (123) connecting the upper slot face and the lower slot face, wherein the side face (123) is provided with an arc-shaped section (124) concentric with the outer arc (110).
2. A rotor as claimed in claim 1, wherein: the side (123) further comprises a first side (125) connecting the arcuate segment (124) and the lower trough surface (122); the circle center of the circumscribed circle and the intersection point of the two adjacent outer arcs are connected to form a straight line q, and the first side faces (125) of the two adjacent permanent magnet grooves (120) are symmetrical about the straight line q.
3. A rotor according to claim 1 or 2, characterized in that: the rotor core (100) is provided with shaft holes (130) for the rotating shaft to pass through, the peripheral wall of the shaft holes (130) axially extends to have the same number as that of the outer circular arcs (110), and the axial projection is a partial circular splitter box (131), and in the axial projection view of the rotor, the centers of the outer circular arcs (110), the splitter boxes (131) and the shaft holes are positioned on the same straight line.
4. A rotor according to claim 3, characterized in that: the magnetic isolation bridge is formed in the area between the arc-shaped section (124) and the outer arc (110), the value range of the width L of the magnetic isolation bridge is 0.5-1 mm, the two opposite first side surfaces (125) of the adjacent splitter boxes (131) form a box body interval L1, and the value range of the L1 is 0.6-1.2 mm.
5. A rotor as claimed in claim 1, wherein: the even number of outer arcs (110) have equal diameters.
6. A rotor as claimed in claim 1, wherein: the cross section of the axial projection of the permanent magnet (200) is rectangular.
7. An electric water pump comprising a pump part (1) and a motor (2), the motor (2) comprising a stator (40) and a rotor (10) according to any one of claims 1 to 6.
8. The electric water pump of claim 7, wherein: the number of outer arcs (110) is 2p, where p is the pole pair number of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111065570.5A CN115811157B (en) | 2021-09-10 | 2021-09-10 | Rotor and electric water pump using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111065570.5A CN115811157B (en) | 2021-09-10 | 2021-09-10 | Rotor and electric water pump using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115811157A CN115811157A (en) | 2023-03-17 |
| CN115811157B true CN115811157B (en) | 2024-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111065570.5A Active CN115811157B (en) | 2021-09-10 | 2021-09-10 | Rotor and electric water pump using same |
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| Country | Link |
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| CN (1) | CN115811157B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734383A (en) * | 2015-04-02 | 2015-06-24 | 佛山市南海九洲普惠风机有限公司 | Novel rotor of brushless direct current motor |
| CN111130238A (en) * | 2018-10-30 | 2020-05-08 | 广东威灵电机制造有限公司 | Motor rotor and motor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012107981A1 (en) * | 2011-02-10 | 2012-08-16 | パナソニック株式会社 | Motor rotor, and fan driving motor provided therewith |
| CN109245411A (en) * | 2018-10-29 | 2019-01-18 | 哈尔滨理工大学 | A kind of low permanent magnet synchronous motor made an uproar that shakes |
| CN112152358B (en) * | 2020-09-29 | 2025-08-29 | 安徽美芝精密制造有限公司 | Rotor laminations, rotor cores, motors and compressors |
-
2021
- 2021-09-10 CN CN202111065570.5A patent/CN115811157B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734383A (en) * | 2015-04-02 | 2015-06-24 | 佛山市南海九洲普惠风机有限公司 | Novel rotor of brushless direct current motor |
| CN111130238A (en) * | 2018-10-30 | 2020-05-08 | 广东威灵电机制造有限公司 | Motor rotor and motor |
Also Published As
| Publication number | Publication date |
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| CN115811157A (en) | 2023-03-17 |
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