JP2009038904A - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-performance stator that enables torque and output enhancement and space saving. <P>SOLUTION: In the stator, each split core 11 has such a structure that a large number of silicon steel plates including a yoke portion 11a and a tooth portion 11b are laminated. At the end of the tooth portion 11b, a flange portion 11c formed by laminating silicon steel plates (magnetic plates) is provided. The direction of lamination of the silicon steel plates of the flange portion 11c is the direction going from the flange portion 11c to the yoke portion 11a, and the planes of each silicon steel plate are substantially orthogonal to the direction of flow of magnetic flux from a rotor. Thus, the magnetic flux from the rotor is guided to the tooth portion 11b along the planes of each steel plate of the flange portion 11c and the amount of magnetic flux reaching a coil in a slot area is reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to the structure of a stator of a motor or a generator in which a coil is wound around a core, and more particularly to a measure for reducing leakage magnetic flux.

  In recent years, with the development of new technologies such as various electric devices, electric vehicles, hybrid vehicles, robots, etc., the performance required for motors and generators used in them has been advanced. For example, in industrial motors, electric vehicles, hybrid vehicles, and the like, higher torque, higher output, and space saving are required.

  Patent Document 1 proposes an embedded permanent magnet synchronous rotating electric machine having a concentrated winding stator coil in order to meet the demands for higher torque, higher output, and space saving. This technology discloses that the generation of eddy current in a coil is suppressed by connecting a plurality of conductive wires in parallel.

JP 2004-208464 A

  However, even when trying to reduce the leakage flux using the technique of Patent Document 1, there is a limit to the reduction of the leakage flux. Therefore, as a result of investigation by the present inventor, it was considered that one of the causes was a large defect in the structure of the buttock.

  That is, the core is configured by laminating a plurality of magnetic steel plates including a yoke part and a tooth part in the axial direction (see paragraph [0011] of the same document). Moreover, in order to suppress that the magnetic flux from a rotor reaches | attains a coil directly, the collar part which protruded from the front-end | tip part is provided in the front-end | tip part of the teeth part. However, it appears that a considerable amount of magnetic flux passes through the collar and reaches the coil, causing eddy currents in the coil. A considerable amount of magnetic flux seems to pass through the collar even in the core formed by sintering after compression molding of powder metal instead of the laminated silicon steel plate.

  The objective of this invention is providing the stator which can utilize magnetic flux efficiently by taking the means to reduce the magnetic flux amount which passes the collar part of a core.

  The stator of the present invention is a stator having a flange portion that protrudes at least from the tip portion of the tooth portion toward the coil side, and the flange portion is laminated in a direction from the tip portion of the teeth portion toward the yoke portion. And a plurality of magnetic plates.

  As a result, since the surface of each magnetic plate is substantially orthogonal to the direction in which the magnetic flux from the rotor flows, the magnetic flux from the rotor is guided to the teeth portion along the surface of each magnetic plate, and the coil in the slot region The amount of magnetic flux that reaches is reduced. And since the quantity of the magnetic flux which passes a teeth part increases, the quantity of the magnetic flux which contributes to a torque also increases, and a magnetic flux is utilized efficiently. Therefore, a high-performance stator capable of achieving high torque, high output, and space saving can be obtained.

  Since the hook part has a ring shape surrounding the tip part of the teeth part, the manufacturing process of the hook part can be simplified.

  Since the core is configured by laminating a plurality of steel plates including the yoke part and the tooth part, the flow of magnetic flux that reaches the yoke part from the collar part through the tooth part is further increased.

  According to the stator of the present invention, it is possible to obtain a high-performance stator capable of increasing torque, increasing output, and saving space by efficiently using magnetic flux.

    FIG. 1 is a cross-sectional view showing a schematic structure of a stator 10 of a rotating electrical machine (motor or generator) in an embodiment, and shows a cross section parallel to a coil end portion. As shown in the figure, the stator 10 is assembled by enclosing a plurality of split cores 11 in an annular shape and enclosing from the outside using a ring member or the like (not shown). In this embodiment, a core in which the divided cores 11 are assembled is used as the core, but the core may be integrated without being divided.

  A rotor (not shown) provided with a permanent magnet is disposed inside the stator 10. A coil 12 is wound around a side region (slot region Rsl) surrounded by the yoke portion 11a, the teeth portion 11b, and the flange portion 11c of the split core 11 with the insulator 13 interposed therebetween. The slot region Rsl is generally trapezoidal or rectangular. The part including the yoke part 11a and the teeth part 11b of the split core 11 is formed by laminating a number of silicon steel plates with a resin insulating layer interposed therebetween, or formed by sintering powder metal after compression molding, etc. Any of these may be used. On the other hand, the flange portion 11c is formed by laminating a plurality of silicon steel plates with a resin insulating layer interposed therebetween, as will be described later.

  In this embodiment, the coil 12 is configured by covering the surface of a conductive wire made of a copper alloy with a resin insulating film, but is not limited to this structure. The cross section of the coil wire has various shapes such as a circle and a hexagon.

  2A and 2B are a perspective view showing a structure before assembly of the split core 11 according to the present embodiment, and a perspective view showing a structure after assembly, in this order. As shown in FIG. 2A, the main part excluding the flange part of the split core 11 of the present embodiment is a magnetic plate including a yoke part 11a and a teeth part 11b protruding from the yoke part 11a to the rotor side. A large number of silicon steel plates are laminated. On the other hand, as the collar portion 1c, a laminate of a plurality of ring-shaped laminated steel plates is prepared. And as shown in FIG.2 (b), the ring-shaped collar part 11c is fitted to the front-end | tip part which opposes the yoke part of the teeth part 11b.

  As a result, as shown in FIG. 2 (b), the yoke portion 11a and the teeth portion 11b of the split core 11 have the same magnetic plate laminated structure as that of a general split core. It has a magnetic plate laminated structure laminated in a direction orthogonal to the laminated structure of the portion 11a and the tooth portion 11b, that is, a hybrid core structure.

  3A and 3B are plan views for explaining the flow of magnetic flux in the conventional split core and the split core of the present invention in order. As shown in FIG. 3A, in the conventional split core, the silicon steel plates in the flange portion 11c are arranged substantially parallel to the flow of magnetic flux, like the yoke portion 11a and the tooth portion 11b. Therefore, the magnetic flux from the rotor passes through the flange portion 11c and easily reaches the coil in the slot region. On the other hand, as shown in FIG. 3B, in the split core of the present invention, the surface of each silicon steel plate in the flange portion 11c is almost orthogonal to the direction in which the magnetic flux from the rotor flows. Is guided to the teeth portion 11b along the surface of each silicon steel plate of the flange portion 11c. Therefore, the amount of magnetic flux reaching the coil in the slot region is suppressed.

  According to the present embodiment, the surface of each silicon steel plate in the flange portion 11c is substantially orthogonal to the direction in which the magnetic flux from the rotor flows, so that the magnetic flux from the rotor is guided to the tooth portion 11b along the surface of each silicon steel plate. As a result, the amount of magnetic flux reaching the coil in the slot region is reduced. That is, the amount of magnetic flux from the rotor that passes through the flange portion 11c and reaches the coil in the slot region can be suppressed. And since the magnetic flux from a rotor is guide | induced to the teeth part 11b from the collar part 11c, the quantity of the magnetic flux (magnetic flux which contributes to a torque) which reaches the yoke part 11a from the teeth part 11b can be increased, and magnetic flux can be efficiently used. Can be used. That is, by reducing the leakage magnetic flux and increasing the amount of magnetic flux that contributes to the torque, it is possible to realize a stator suitable for high torque, high output, and space saving.

(Other embodiments)
In the said embodiment, although the ring-shaped collar part 11c is made to fit in the front-end | tip part of the teeth part 11b, the collar part 11c is not ring shape but flat form, and it adhere | attaches only on the coil side side, etc. May be provided. In terms of performance, it is preferable to provide a plate-shaped flange, but the structure of the above embodiment is preferable from the viewpoint of ease of the assembly process. Further, the collar portion 11c may be an open ring shape or a U-shape instead of the closed ring shape as in the above embodiment.

  Moreover, in the said embodiment, although the part containing the yoke part 11a and the teeth part 11b assumed that many silicon steel plates were laminated | stacked on both sides of the resin insulation layer, this invention is not limited to this embodiment. Alternatively, the powder metal may be formed by compression molding and then sintering. If the brim portion is constructed by compression molding powder metal and then sintering integrally with the yoke portion and the teeth portion, a considerable amount of magnetic flux also passes through the brim portion to cause a coil in the slot region. Therefore, by providing the collar part of the present invention, the same effect as the above embodiment can be exhibited.

  In the said embodiment, although the example which applied this invention to the division | segmentation stator of a rotary electric machine (a motor or a generator) was shown, the stator of this invention is not limited to this embodiment, An integrated type is shown. It can also be applied to a stator. The stator of the present invention can also be applied to a linear motor stator that is not a rotating electrical machine.

  The structure of the embodiment of the present invention disclosed above is merely an example, and the scope of the present invention is not limited to the scope of these descriptions. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  The stator of the present invention can be used for motors and generators disposed in industrial motors, hybrid vehicles, electric vehicles, fuel cell vehicles, robots, and the like.

It is sectional drawing which shows the schematic structure of the stator in embodiment. (A), (b) is a perspective view which shows the structure before the assembly of the split core which concerns on this Embodiment in order, and the perspective view which shows the structure after an assembly. (A), (b) is a top view explaining the flow of the magnetic flux in the split core of a conventional structure, and the split core of this invention in order.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Divided core 11a Yoke part 11b Teeth part 11c Eaves part 12 Coil 13 Insulator

Claims (3)

A core composed of a magnetic material as a main component and having a yoke part and a tooth part;
A coil member wound around the teeth portion of the core;
A collar portion provided to protrude at least on the coil side side from a tip portion facing the yoke portion of the teeth portion,
With
The said collar part is a stator comprised with the some magnetic board laminated | stacked in the direction which goes to the said yoke part from the front-end | tip part of the said teeth part. The stator according to claim 1, wherein
The said collar part is a stator which has the ring shape surrounding the front-end | tip part of the said teeth part. The stator according to claim 1 or 2,
The said core is a stator comprised by laminating | stacking several magnetic steel plates containing a yoke part and a teeth part.

Images