JP2007189785A - Stator for rotating electrical machine, method for manufacturing the stator, and housing used for the stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator having an inexpensive and simple structure for annularly supporting and fixing divided cores, miniaturized, and increasing an output. <P>SOLUTION: The divided dust cores 12 are annularly disposed within a housing 11. Upper and lower faces of a back yoke 12b at the divided core are supported by upper and lower clip pieces 15, 16. The divided cores 12 are supported and fixed by clipping within the housing 11. The dust core is superior in high-frequency performance, and suitable for miniaturization and increase in the output. The upper clip piece 15 is provided in an annular ring 18, and abuts on a surface of the back yoke at the divided core 12 by fixing the annular ring to a flange 17 on a circumference of the cylindrical housing by a screw 19. A clipping force of the upper and lower clip pieces 15, 16 is ensured by an abutment force. The clipping force by the screw can be comparatively and easily adjusted. A minimum necessary force for fastening the divided cores is easily obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electric machine (motor) for a hybrid vehicle, a fuel cell vehicle, and the like, a method for manufacturing the stator, and a housing used for the stator.

As shown in FIG. 18, the stator S of a rotating electrical machine normally has a split core 2 arranged in an annular shape along the inner surface in a cylindrical housing 1, and each of the split cores (teeth) 2 has a coil 3. In which a rotor 4 is loaded concentrically, a three-phase AC power source is supplied to each coil 3 to form a magnetic field in each core 2, and the rotor 4 is rotated. Yes (see Patent Document 1).
Japanese Patent Laid-Open No. 11-308830

  In the stator S, the annular split core 2 is generally fixed by means of shrink-fitting the housing 1 on the outer peripheral surface of the split cores 2 arranged in an annular shape. However, the fixing by shrink fitting is momentum if a sufficient fixing force is obtained, and the shrink fitting force is excessively set, and the corner portion a of the back yoke 2a of the split core 2 shown in FIG. A large stress is applied, and the corner portion a may be damaged.

  For this reason, while supporting the lower surface of each division | segmentation core 2 with the nail | claw which protrudes inward from the inner surface of the housing 1, a ring is provided in the upper surface of the division | segmentation core 2, and the division | segmentation core 2 is clamped by this ring and the said nail | claw, Further, there is a technique in which a pin is inserted into the ring and the split core 2 and the split core 2 is prevented from moving in the circumferential direction by the pin (see Patent Document 1).

Nowadays, hybrid vehicles and fuel cell vehicles have been developed from the viewpoint of environmental problems. These vehicles use a rotating electrical machine as an auxiliary drive source or a main drive source, and the rotating electrical machine is naturally required to be downsized. The One means for reducing the size of the rotating electrical machine is to reduce the size of the stator.
For example, in a hybrid vehicle, direct current from a battery is converted into three-phase alternating current by an inverter, and the three-phase alternating current power is supplied to each coil. Today, a high voltage of about 500 V is used for the three-phase alternating current to increase the output of the rotating electrical machine.

In order to reduce the size and increase the output of this rotating electrical machine, it is conceivable to increase the rotational speed (higher frequency). However, due to the higher frequency, the loss of eddy current generated in the core 2 of the stator S increases and the iron loss is reduced. It becomes large and the rotation efficiency decreases.
Under such circumstances, development of a powdered split core having a lower iron loss at a high frequency compared to a conventional split core made of electrical steel sheet is underway. Since this powder core confines eddy currents in the particles, it can essentially suppress eddy currents and has good high-frequency performance.

The technology for preventing the split core from moving in the circumferential direction by the pins has many work steps such as insertion of the pins and mounting of the ring, and the number of parts is large, so that it is not suitable for cost reduction of the stator.
In particular, when the divided core 2 is made of compacted powder, it is troublesome to form pin holes in the core 2.

  In view of the above situation, it is a first object of the present invention to support and fix a split core in a cylindrical housing with an inexpensive and simple structure, and in addition to that, a stator that can withstand a small size and high output can be obtained. Let it be the 2nd subject.

In order to achieve the first object, according to the present invention, first, the annular split core is sandwiched and supported by upper and lower sandwiching pieces protruding inward from the inner surface of the cylindrical housing. .
Since the fastening by clamping from the upper and lower surfaces of the split core is easy to manage the clamping force by adjusting the force that gives the clamping force, the clamping force of the split core can be minimized.

Next, according to the present invention, at least one of the sandwiching pieces is provided on an annular ring along the peripheral edge of the cylindrical housing, and the annular ring is screwed to the peripheral flange of the cylindrical housing. Thus, the one clamping piece is brought into pressure contact with the surface of the back yoke of the split core, and the clamping force of both the upper and lower clamping pieces is secured by this pressing force.
Adjustment of the clamping force by the screwing is relatively easy, and it is easy to minimize the fastening force of the split core.

In order to achieve the second problem described above, the present invention is to form the split core by compacting.
As described above, the dust core has good high-frequency performance, is suitable for miniaturization and high output, and is usually manufactured by molding. Therefore, the concave portion of the back yoke can be easily formed. It can be said that these problems can be easily achieved.

As described above, according to the present invention, the split core is supported and fixed to the cylindrical housing by sandwiching the upper and lower sides, so that the inexpensive and simple structure can be obtained, and an inexpensive stator can be obtained.
In addition, a compact and high output stator can be obtained by using a dust core.

  In an embodiment of the present invention, in a stator of a rotating electrical machine in which a split core is disposed in an annular shape along an inner surface of a cylindrical housing, and a coil is wound around each of the split cores, Nipping pieces sandwiching the upper and lower surfaces of each of the split cores are provided inwardly at the edges, and at least one of the both holding pieces is provided in an annular ring along the peripheral edge of the cylindrical housing, and the annular ring is Screwed to the flange on the peripheral edge of the cylindrical housing, the one clamping piece is pressed against the surface of the back yoke of the split core by the screwing, and the clamping force of the upper and lower clamping pieces is secured by this pressing force. The configuration can be adopted.

  The screwing position is arbitrary as long as an effective clamping force can be obtained. For example, the screwing position can be the one clamping piece or another position.

  The split core may be made of a magnetic steel sheet as long as the present invention can be implemented. However, it is preferable that the split core is made of compacted powder in terms of miniaturization and high output.

  The stator of the above rotating electric machine can be manufactured by various methods. For example, the cylindrical housing has a flange on the upper peripheral edge and a lower holding piece protruding inward from the inner surface on the lower peripheral edge. In the cylindrical housing, the divided core is supported on the lower holding piece by placing the lower surface of the back yoke in an annular shape and then supporting the flange around the flange along the circumferential direction of the flange. Applying an annular ring having an upper sandwiching piece protruding in the direction, the annular ring is screwed to the flange, and by the screwing, the upper sandwiching piece is pressed against the surface of the back yoke of the split core, It is possible to adopt a configuration in which the clamping force of the upper and lower clamping pieces is secured by this pressure contact force, and the divided cores are arranged and supported in an annular shape along the inner surface in the cylindrical housing.

  One embodiment is shown in FIG. 1 to FIG. 7A, and this embodiment relates to a stator S of a rotary electric machine for a fuel cell vehicle and a rotary electric machine for a hybrid vehicle. The split cores 12 are arranged in an annular shape along the inner surface, and coils 13 are wound around the split cores 12 respectively. Usually, the coil 13 is wound around the core 12 before the split core 12 is arranged in the housing 11.

  The split core 12 is made of compacted powder, and has a back yoke 12b on the rear surface of the core body (tooth) 12a around which the coil 13 is wound as shown in FIG.

  An outward flange 17 is formed on the upper peripheral edge of the cylindrical housing 11, and an annular ring 18 is applied to the flange 17. The upper clamping pieces 15 are integrally formed at equal intervals in the circumferential direction of the annular ring 18. The sandwiching pieces 15 may correspond to the respective divided cores 12, but every two or the like and the number of the divided cores 12 corresponding thereto are arbitrary. When the split cores 12 are fastened in an annular shape, they are integrated by mutual resistance in the circumferential direction, so that the integrated split cores 12 are arranged at upper and lower surfaces at arbitrary positions such as at equal intervals. This is because it is only necessary to hold it.

  An inward flange 16 is formed on the lower peripheral edge of the cylindrical housing 11, and the flange 16 serves as a lower sandwiching piece and sandwiches the upper and lower surfaces of each divided core 12 with the sandwiching piece 15. The flange 16 can also be a piece divided in the circumferential direction. Similarly to the sandwiching pieces 15, the number of the divided pieces is arbitrary at the circumferentially equidistant positions.

  The cylindrical housing 11 has a jig 20 disposed concentrically at the center thereof. The outer peripheral surface of the jig 20 is circular, and when the split core 12 is annularly arranged on the outer peripheral surface and the inner side surface abuts, the rotor is loaded at the center of the annular split core 12. The curvature is set so that a required gap is secured between the inner peripheral surface of each divided core 12 and the outer peripheral surface of the rotor.

As a manufacturing method of the annular ring 18 with the clamping piece 15, for example, the methods shown in FIGS. 4 and 5a to 7a can be employed. That is, as shown in FIG. 4, a ring plate 18a having a width of the protruding length of the holding piece 15 is prepared, and the ring plate 18a is pressed to be held inside the annular ring 18 shown in FIG. 5a. In addition to having the pieces 15, screw holes (through holes) 18 b are formed in the respective holding pieces 15.
Next, as shown in FIG. 6a, the base portion of each clamping piece 15 is slightly raised upward by pressing or the like, and the tip portion 15a is formed in an L shape from the screw hole 18b. The horizontal portion of the tip portion 15a protrudes from the lower surface of the annular ring 18 (positioned at the lower position).

The cylindrical housing 11 and the like of this embodiment have the above-described configuration. Next, support and fixing of the split core 12 by the cylindrical housing 11 will be described.
First, as shown in FIG. 2 (a), the jig 20 is arranged concentrically in the cylindrical housing 11, and the divided cores 12 are arranged in an annular shape around the jig 20 (FIG. 2 (b)). At that time, each divided core 12 is supported by placing the lower surface of the back yoke 12b on the lower holding piece 16.

  Next, as shown in FIGS. 1 and 3, the annular ring 18 is applied to the upper flange 17 of the cylindrical housing 11, and screws 19 are inserted through the screw holes 18 b and screwed into the screw holes 17 a of the flange 17. By this screwing, the annular ring 18 is brought into pressure contact with the flange 17, and the upper clamping piece 15 abuts against the back yoke 12 b of the split core 12 arranged in an annular shape. For this reason, by adjusting the screwing amount of the screw 19, the contact force is also adjusted, and the contact force (screwing amount) is adjusted so that each divided core 12 is placed in the cylindrical housing 11 even if rotational torque acts. It is set as appropriate by experiments or the like so as to continue to be supported in an annular shape along the inner surface.

  The number (interval) of the ring 18 in the circumferential direction is arbitrary as long as a sufficient abutting force of each upper clamping piece 15 can be obtained. For example, a screw hole 18 b can be provided for every three divided cores 12.

  FIG. 13 to FIG. 15 show another embodiment, and this embodiment is the one in which screw holes 18b are formed in each upper clamping piece 15 in the previous embodiment. The annular ring 18 is manufactured as shown in FIGS. 4, 5 (b) to 7 (b), for example, as shown in FIGS. 4, 5 (a) to 7 (a). To do.

  Similarly to the above embodiment, the cylindrical housing 11 and the like of this embodiment are first arranged in an annular shape around the jig 20 as shown in FIG. The lower surface of the back yoke 12b is placed on and supported by the lower holding piece 16.

  Next, the annular ring 18 is applied to the upper flange 17 of the cylindrical housing 11, the screws 19 are inserted through the screw holes 18 b and screwed into the screw holes 17 a of the flange 17, and the annular ring 18 is pressed against the flange 17. . Accordingly, the upper clamping piece 15 comes into contact with the back yoke 12b of the split core 12 arranged in an annular shape. Therefore, even if the screwing amount of the screw 19 is adjusted and rotational torque acts, The cylindrical housing 11 is arranged and supported in an annular shape along the inner surface thereof.

As a manufacturing method of the annular ring 18, the method shown in FIGS. That is, it is assumed that one long piece 18 'shown in FIG. 8 has a sandwiching piece 15 on one side edge thereof by press working (FIGS. 9 to 10). As shown in FIG. 12, it is made into an annular shape by roll processing. The butted ends in the annular shape can be joined by welding or the like.
9 to 12, each (a) shows the case of the embodiment shown in FIG. 1, and each (b) shows the case of the embodiment shown in FIG.

In each embodiment, the lower clamping piece 16 can be formed by cutting and raising the lower edge of the cylindrical housing 11 as shown in FIG.
Further, the lower holding piece 16 has the same configuration as the upper holding piece 15 (using an annular ring 18 or the like), or the lower holding piece 16 has the same configuration as the upper holding piece 15 (the configuration shown in FIGS. 1 and 13). And the upper clamping piece 15 may have the same configuration as the lower clamping piece 16 (configuration shown in FIGS. 1 and 13).

  Needless to say, the present invention is not limited to the stator S of the rotating electric machine for fuel cell vehicles or hybrid vehicles of the embodiment, and can be applied to the stators of various rotating electric machines regardless of the size.

Perspective view of one embodiment Assembly explanatory diagram of the embodiment Assembly explanatory diagram of the embodiment Assembly explanatory diagram of the embodiment Production explanatory diagram of the annular ring of the embodiment Production explanatory diagram of the annular ring of the embodiment Production explanatory diagram of the annular ring of the embodiment AA line sectional view in FIG. Production explanatory drawing of another annular ring of the embodiment Production explanation drawing of the ring Production explanation drawing of the ring AA line sectional view in FIG. Production explanation drawing of the ring Perspective view of another embodiment Assembly explanatory diagram of the embodiment Assembly explanatory diagram of the embodiment Perspective view of split core of each embodiment The principal part perspective view of another Example Plan view of conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11 Cylindrical housing 2, 12 Split core 2a, 12b Core back yoke 3, 13 Coil 15 Upper clamping piece 15a Upper clamping piece tip 16 Lower clamping piece (flange)
17 Upper edge flange 17a of cylindrical housing Screw hole 18 Ring 18b Ring screw hole 19 Ring 20 Jig S Stator

Claims (6)

A cylindrical housing (11), a split core (12) disposed in an annular shape along the inner surface of the cylindrical housing (11), and a coil wound around each of the split cores (12) ( 13), sandwiching pieces (15, 16) sandwiching the upper and lower surfaces of each of the split cores (12) respectively provided on the upper and lower peripheral edges of the cylindrical housing (11), and both sandwiching pieces thereof An annular ring (18) along the periphery of the cylindrical housing (11) provided with at least one of (15, 16),
The annular ring (18) is fastened with a screw (19) to a peripheral flange (17) of the cylindrical housing (11), and the one clamping piece (15) is fixed to the split core (12) by the screwing. A stator for a rotating electrical machine, wherein the stator is pressed against the surface of a back yoke (12b), and the holding force of the upper and lower holding pieces (15, 16) is secured by this pressing force.   The stator of a rotating electrical machine according to claim 1, wherein the screwing is made at a position different from the one clamping piece (15).   The stator of a rotating electrical machine according to claim 1, wherein the screwing is made at the position of the one clamping piece (15).   The stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the divided core (12) is made of dust. A housing used for a stator of a rotating electrical machine according to any one of claims 1 to 4,
The cylindrical housing (11), the lower holding pieces (16) of the holding pieces (15, 16) provided at the lower peripheral edge of the cylindrical housing (11), and the cylindrical housing (11 ) And an annular ring (18) secured to the flange (17) at the peripheral edge thereof, and an upper clamping piece (15) of the both clamping pieces (15, 16) provided on the annular ring (18). Consisting of
By screwing the flange (17) of the annular ring (18), the upper clamping piece (15) is pressed against the surface of the back yoke (12b) of the split core (12). Each divided core (12) is clamped by upper and lower clamping pieces (15, 16), and the divided core (12) is attached to the cylindrical housing (11) by clamping both of the clamping pieces (15, 16). A housing used for a stator of a rotating electrical machine. A method for manufacturing a stator (S) for a rotating electrical machine according to any one of claims 1 to 4,
The cylindrical housing (11) has a flange (17) on its upper peripheral edge and a lower clamping piece (16) protruding inward from the inner surface on its lower peripheral edge. Further, after the divided core (12) is supported on the lower holding piece (16) by placing the lower surface of the back yoke (12b) on the lower holding piece (16), the flange (17) extends along the circumferential direction of the flange (17). An annular ring (18) having an upper clamping piece (15) projecting inwardly around is applied, and the annular ring (18) is screwed (19) to the flange (17). The upper holding piece (15) is pressed against the surface of the back yoke (12b) of the split core (12), and the holding force of the upper and lower holding pieces (15, 16) is secured by this pressing force. Split core (12) into cylindrical housing (11) the production method of a rotating electric machine of the stator, characterized in that placing the support in an annular along the inner surface within.

Images