JP2007129835A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the generation of the noise and vibration of a motor even if a stator core constituted of divided cores is employed. <P>SOLUTION: In the motor that comprises the stator core constituted of the divided cores 12 divided in a direction intersecting with a circumferential direction in a yoke 11b, each divided core 12, when the cores are combined in a ring shape, is constituted so that a face (C face) among divided faces (A face, B face and C face) that abut on other adjacent cores in the vicinity of a rotor that rotates around the internal periphery of the stator core is preferentially in contact with the core. Each cores 12 is combined with one another so as to form a ring shape, and constituted so that the abutting pressure of the face (C face) in the vicinity of the rotor among the divided faces becomes higher than that of the face (A face) that is apart from the rotor, in a state that the cores are integrally held by receiving a pressing force from the external periphery. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor, and more particularly, to a motor including a stator core composed of divided cores divided in a direction intersecting a circumferential direction in a yoke portion.

  A conventional motor includes a stator (stator) in which a coil core wire is wound around a stator core (iron core) and stacked in multiple layers. In a large motor mounted on a vehicle such as a hybrid car, a large stator core is used. Since a large-sized stator core may cause a reduction in material yield when an integral type is used, a stator core composed of divided cores divided at the yoke portion has been used. The following is disclosed as a conventional stator core for fixing such divided cores side by side.

  In the invention described in Patent Document 1, a stator core of a linear motor in which a plurality of partial iron cores divided into segments in which iron core punches are laminated is joined and integrated with each other at the yoke portion. In the above, the joining portion is abutted at a position shifted by a slight length in the stacking direction of the core cores constituting the partial core.

  In the invention described in Patent Document 2, in the split-type annular core, a core in which a connecting core portion is formed between arc-shaped portions formed on the inner peripheral side and the outer peripheral side, and the connecting core portion, A plurality of split cores composed of resin-molded portions covering the opposing sides of the inner circumferential side and the outer circumferential side arc-shaped portion are arranged side by side with the arc-shaped portion adjacent to each other, and further inside the annular member It is characterized by being inserted.

  In the invention described in Patent Document 3, in a stator of a rotating electrical machine, after dividing an iron plate that is divided in a circumferential direction for each pole tooth unit and that has an uneven fitting portion on a divided surface, the inner diameter and outer diameter thereof are set. Laser welded into a laminated iron core piece, provided with a winding portion orthogonal to the pole tooth portion of the laminated iron core piece, a predetermined number of the laminated iron core pieces are connected in an annular shape, and the outer peripheral portion of the coupling surface is laminated in the stacking direction It is characterized by being fixed by laser welding.

Japanese Patent Laid-Open No. 3-78447 Japanese Patent Laid-Open No. 6-311675 Japanese Patent Laid-Open No. 7-7875

  However, none of the inventions described in Patent Documents 1 to 3 refer to or stipulate how to divide the divided surfaces. The way of abutment of the dividing surface influences the strength of the stator that consists of the divided cores arranged in an annular shape.A motor that does not specify how to abut the dividing surface can be shaped, but the noise and vibration of the motor May grow.

  The main object of the present invention is to suppress motor noise and vibration even when a stator core composed of divided cores is used.

  In a first aspect of the present invention, in a motor including a stator core composed of split cores that are split in a direction intersecting the circumferential direction in the yoke portion, each of the split cores is combined in an annular shape. In addition, among the divided surfaces in contact with other adjacent divided cores, the stress of the divided surface in the vicinity of the rotor rotating on the inner periphery or the outer periphery of the stator core is larger than the stress of the other part of the divided surface. It is characterized by being fastened to.

  In the motor of the present invention, the rotor rotates on the inner periphery of the stator core, and when the plurality of divided cores are combined in an annular shape, the inner surfaces of the divided surfaces come into contact with each other, It is preferable that a gap exists between the surfaces near the outer periphery among the divided surfaces.

  In the motor of the present invention, when the divided cores are combined in an annular shape and are held together by receiving a radial pressure, a surface in the vicinity of the rotor among the divided surfaces is It is preferable that the contact pressure is higher than that of the far surface of the rotor.

  In the motor according to the aspect of the invention, it is preferable that the divided surface of the divided core is formed such that a surface in the vicinity of the rotor is a flat surface, and other surfaces are formed as a flat surface or a curved surface.

  In the motor according to the aspect of the invention, it is preferable that the split surface of the split core has a fitting portion including a concave portion and a convex portion at an intermediate portion.

  In the motor according to the aspect of the invention, it is preferable that the divided surface of the divided core has an area of a surface near the rotor larger than an area of a surface far from the rotor.

  According to the present invention (claims 1-6), the motor can be reduced in noise and vibration. In other words, the rigidity of the stator core can be improved by preferentially contacting the surface in the vicinity of the rotor among the split surfaces of the split core as compared to the case where this is not the case (when the surface far from the rotor is preferentially in contact). As a result, when operating as a motor, the amount of magnetic pole displacement of the stator core due to the radial and circumferential attractive repulsive forces acting on the magnetic poles can be kept small, and the motor can be reduced in noise and vibration. In addition, the stator core can be improved in rigidity by preferentially abutting the surface in the vicinity of the rotor among the split surfaces of the split core, and when this is not the case (when the distant surface of the rotor is preferentially in contact). This is because the bending rigidity can be increased by the dimension in the radial direction because the surface is caught in the vicinity of the rotor.

(Embodiment 1)
A motor according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing a configuration of a motor according to Embodiment 1 of the present invention. FIG. 2 is a plan view when seen from the axial direction schematically showing the configuration of the stator of the motor according to the first embodiment of the present invention. FIG. 3 schematically shows the configuration of the stator core and core holder assembly (excluding coils and the like) of the motor according to the first embodiment of the present invention, (A) a plan view when viewed from the axial direction; B) It is an expanded sectional view between XX '. FIG. 4 is a partially enlarged plan view when viewed from the axial direction schematically showing the configuration of the stator core of the motor according to the first embodiment of the present invention.

  Referring to FIG. 1, the motor 1 is a brushless type motor and includes a stator 10 and a rotor 20.

  The stator 10 is a stator configured in an annular shape or a cylindrical shape as a whole. The stator 10 includes a stator core 11, an insulating member 13, a coil 14, a bus ring 15, and a core holder 16 (see FIGS. 1 to 4).

  The stator core 11 is press-fitted into the core holder 16 by combining a plurality of divided cores 12 that are divided in a direction intersecting the circumferential direction in the yoke portion 11b for each tooth portion 11a. The split core 12 can be aligned with another adjacent split core 12 by fitting the convex portion 12a and the concave portion 12b. The convex portion 12a and the concave portion 12b have an arc shape that is in a fitting relationship with each other so that the roundness of the outer periphery when the divided cores 12 are arranged in an annular shape can be secured. By making the convex part 12a and the concave part 12b into an arc shape, the facing area can be increased and the magnetic resistance can be reduced. Of the split surface of the split core 12, the inner peripheral side and outer peripheral side portions other than the convex portions 12a and the concave portions 12b are flat. The divided cores 12 receive pressure in the radial direction by the core holder 16, and the divided cores 12 are held in contact with each other in the circumferential direction by the pressure, and are held together and fixedly integrated. The divided core 12 is configured such that a surface near the rotor 20 (a surface closer to the inner periphery) among the divided surfaces with the other adjacent divided cores 12 is preferentially in contact. In other words, in the state where the stator core 11 in which the plurality of divided cores 12 are annularly combined is integrally held by the core holder 16, each divided core 12 is a surface closer to the inner periphery (C surface in FIG. 4) among the divided surfaces. Is configured to be higher in pressure than the surface near the outer periphery (surface A in FIG. 4). Further, the area of the surface near the inner periphery (the C surface in FIG. 4) is larger than the area of the surface near the outer periphery (the A surface in FIG. 4).

  In addition, when a rotor is an outer rotor, the surface near an outer periphery contacts preferentially among division surfaces with an adjacent division core.

  The insulating member 13 is a bobbin-shaped member that provides electrical insulation between the coil 14, the stator core 11, and the bus ring 15, and is attached to the tooth portion 11 a of the stator core 11.

  The coil 14 is made of a wire having an insulating film on the surface, and is configured by winding a wire around the outer periphery of an insulating member 13 attached to the stator core 11. A wire is drawn from both ends of the coil 14 and electrically and mechanically connected to the corresponding bus ring 15.

  The bus ring 15 is a ring-shaped conductive member connected to the coil 14. The bus ring 15 is disposed on the outer peripheral side of the coil 14 and is attached to the insulating member 13 so as to be inserted from the motor axial direction. The bus ring 15 is composed of a plurality of rings insulated from each other. Each ring is electrically connected to a connector (not shown) outside the motor cover 41 via wiring (not shown).

  The core holder 16 is a ring-shaped holder that holds the stator core 11 in which a plurality of divided cores 12 are combined in an annular shape from the outer peripheral side or one side in the motor axial direction. The core holder 16 is fixed to the motor cover 41 with bolts 42. The motor cover 41 is fixed to the engine housing 46 by bolts (not shown). A connector (not shown) is attached to the outside of the motor cover 41 with bolts 44.

  The rotor 20 is an inner-type rotor disposed on the inner periphery of the stator 10 with a predetermined interval. In the rotor 20, a permanent magnet 22 is embedded in a rotor core 21, the rotor core 21 is sandwiched between end plates 23 a and 23 b, and the end plates 23 a and 23 b are fixed by fixing pins 24 that pass through the rotor core 21. . The end plate 23 b is fixed to the wheel member 34 by bolts 35. The wheel member 34 is fixed by a bolt 33 to a crankshaft 31 of an engine (not shown) via a shaft 32.

  In addition, although FIGS. 1-4 demonstrated the motor used for a hybrid car as an example, it is not restricted to this.

  Next, the characteristics of the stator core in the motor according to the first embodiment of the present invention will be described using a comparative example. 5A and 5B are schematic views showing the acting force between the divided cores. FIG. 5A is an example of the present invention, FIG. 5B is a comparative example 1, and FIG. 5C is a comparative example 2. FIG.

  Here, the magnetic pole displacement ratio was measured as a characteristic of the stator core. As a sample, an example in which the inner peripheral surface of the stator core split surface abuts and the outer peripheral surface has a gap, and the outer peripheral surface of the stator core split surface contacts and the inner peripheral surface has a gap. The comparative example 1 which has, and the comparative example 2 with which the stator core was integrally molded were prepared. In addition, Example, the comparative example 1, and the comparative example 2 share dimensions other than a division surface, and shall mount and measure on the same measuring device. Here, the magnetic pole displacement amount ratio refers to a ratio when the displacement amount of the magnetic pole (tooth portion) of the stator core according to Comparative Example 2 is 1.

  Table 1 shows the split surface contact relationship and the magnetic pole displacement ratio of Example, Comparative Example 1, and Comparative Example 2.

  As can be seen from the results of Table 1, the magnetic pole displacement amount ratio is comparative example 2 <example <comparative example 1, and in particular, the magnetic pole displacement amount ratio of the embodiment can be suppressed to a slight increase compared to comparative example 2. I understand that I can do it. This can be explained by the distribution of force acting on the split core. Referring to FIG. 5, when radial and circumferential forces acting on the magnetic poles when operating as a motor are applied, the example (see FIG. 5A) is the comparative example 1 (see FIG. 5B). Therefore, the bending rigidity can be increased by the dimension in the radial direction. Therefore, in the embodiment, the amount of displacement can be made smaller than that in the comparative example 1.

  In addition to the configuration of the split surface of the split core, in order to reduce the amount of magnetic pole displacement, the core holder is increased in thickness to increase the rigidity of the core holder, the core holder is provided with ribs, or the split core and the core holder are press-fitted. There are methods such as increasing the number, but all of them increase the assemblability, increase the cost, and increase the weight.

  According to the first embodiment, on the split surface of the split core, the contacted portion is a portion closer to the rotor (inner peripheral side), thereby improving the rigidity of the stator core and bringing it closer to the magnetic pole displacement amount of the integrated stator core. The noise and vibration of the motor can be reduced without increasing the cost and weight.

It is sectional drawing which showed typically the structure of the motor which concerns on Embodiment 1 of this invention. It is a top view when it sees from the axial direction which showed typically the structure of the stator of the motor which concerns on Embodiment 1 of this invention. (A) The top view when it sees from the axial direction which showed typically the structure of the stator core of the motor which concerns on Embodiment 1 of this invention, and the assembly of a core holder (except a coil etc.), and (B) X- It is an expanded sectional view between X '. It is the elements on larger scale when it sees from the axial direction which showed typically the structure of the stator core of the motor which concerns on Embodiment 1 of this invention. It is the schematic diagram which showed the action force between division | segmentation cores, (A) is an Example of this invention, (B) is related with the comparative example 1, (C) is related with the comparative example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 10 Stator 11 Stator core 11a Teeth part 11b Yoke part 12 Split core 12a Convex part (fitting part)
12b Concave part (fitting part)
DESCRIPTION OF SYMBOLS 13 Insulation member 14 Coil 15 Bus ring 16 Core holder 20 Rotor 21 Rotor core 22 Permanent magnet 23a, 23b End plate 24 Fixing pin 31 Crankshaft 32 Shaft 33 Bolt 34 Wheel member 35 Bolt 41 Motor cover 42 Bolt 44 Bolt 46 Engine housing 47 Rotation sensor

Claims (6)

In a motor comprising a stator core composed of divided cores divided in a direction intersecting the circumferential direction in the yoke part,
When the divided cores are combined in an annular shape, among the divided surfaces that abut against other adjacent divided cores, the stress of the divided surface in the vicinity of the rotor that rotates on the inner periphery or the outer periphery of the stator core A motor characterized in that it is fastened so as to be larger than the stress of other portions of the surface. The rotor rotates on the inner periphery of the stator core;
The plurality of divided cores are configured such that, when combined in an annular shape, the inner surfaces of the divided surfaces are in contact with each other and a gap exists between the outer surfaces of the divided surfaces. The motor according to claim 1, wherein:   When the divided cores are combined in an annular shape and are held together by receiving a radial pressure, a surface in the vicinity of the rotor of the divided surfaces is more than a surface far from the rotor. The motor according to claim 1, wherein the contact pressure is increased.   The split surface of the split core is formed such that a surface in the vicinity of the rotor is a flat surface, and the other surface is a flat surface or a curved surface. The motor described.   The motor according to any one of claims 1 to 4, wherein the split surface of the split core has a fitting portion formed by a concave portion and a convex portion at an intermediate portion.   The motor according to any one of claims 1 to 5, wherein the divided surface of the divided core has an area of a surface in the vicinity of the rotor larger than an area of a distant surface of the rotor.

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