JP2008263719A - Insulator, stator of rotating electric machine and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulator which suppresses backlash after assembly, a stator equipped with the insulator, and a rotating electric machine equipped with the stator. <P>SOLUTION: The insulator is arranged so as to be engaged with and fit to the external periphery of teeth which radially protrude from a ring-shaped yoke. The insulator has a plurality of faces facing the teeth, protrusions abutting on the teeth are formed at least one face of the plurality of faces, and the protrusions are formed at only a part in the face in a direction orthogonal to the engaging/fitting direction of the insulator. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an insulator, a rotating electric machine stator, and a rotating electric machine technology.

  Generally, a rotating electrical machine includes a stator and a rotor, and the rotor and the rotor interact electromagnetically to rotate the rotor and generate a driving force.

  FIG. 15 is a partial schematic plan view showing a configuration of a stator used in the electric motor. As shown in FIG. 15, the stator 48 includes a stator core having an annular yoke portion 50 and a tooth portion 52 protruding in the radial direction of the yoke portion 50, a coil 54, and an insulator 56.

  FIG. 16 is a schematic perspective view illustrating an example of a configuration of a general insulator used for the stator. As shown in FIG. 16, the insulator 56 includes a fitting insertion hole 58, a housing part 60, and a flange part 62. In the accommodating portion 60, a coil 54 having a predetermined number of windings is disposed. The tooth portion 52 is inserted into the insertion hole 58. The flange portion 62 is for preventing the coil 54 from falling off the insulator 56.

  When manufacturing the stator 48, it is difficult to make the dimensions of the plurality of teeth portions 52 uniform. Therefore, a gap may be formed between the teeth portion 52 and the fitting insertion hole 58 of the insulator 56. . In such a case, when the stator 48 is manufactured, the insulator 56 may drop off or shift from the tooth portion 52 due to vibrations or the like during operation of the rotating electric machine, and the coil 54 may be disconnected.

  Therefore, it extends over the other end portion (end portion 56b shown in FIG. 16) on the same side surface from the end portion (end portion 56a shown in FIG. 16) of the insulator to the axial direction of the stator (arrow Y shown in FIG. 16). Thus, there has been proposed a rotating electrical machine that can fix an insulator to a tooth portion by providing a protrusion and fitting the protrusion into a groove provided in the tooth portion (see, for example, Patent Documents 1 and 2). .

  In addition, a rotating electrical machine has been proposed in which an elastic portion is provided on a side surface of an insulator so that the insulator is in elastic contact with the tooth portion and the insulator can be fixed to the tooth portion (see, for example, Patent Document 3).

JP 2000-14057 A JP 2001-136698 A JP 2004-297986 A

  However, in the rotating electrical machines disclosed in Patent Documents 1 and 2, since it is difficult to manage the size of the protruding portion of the insulator for fitting into the groove portion provided in the tooth portion, even if the protruding portion is fitted into the groove portion of the tooth portion, the protruding portion A gap is likely to be formed between the groove portion and the groove portion. For this reason, the insulator cannot be sufficiently fixed to the tooth portion, and assembly of the insulator may occur. Moreover, since the protrusion part of an insulator is provided over the other end part which goes to the lamination direction of a stator from the side surface edge part of an insulator, when inserting a teeth part, an excessive insertion load is carried out to an insulator. In addition, the insulator is easily deformed. For this reason, the insulator cannot be sufficiently fixed to the tooth portion, and assembly of the insulator may occur.

  Moreover, in the insulator of patent document 3, since the shape and dimension setting of the elastic part provided in an insulator are difficult, an insulator cannot fully be fixed to a teeth part and an assembly backlash may generate | occur | produce in an insulator. .

  The present invention relates to an insulator capable of suppressing the occurrence of assembly backlash of an insulator, a stator including the insulator, and a rotating electrical machine including the stator.

  The present invention is an insulator that is fitted and arranged on an outer periphery of a teeth portion that protrudes in a radial direction from an annular yoke portion, and the insulator includes a plurality of surfaces that face the teeth portion, and is at least one of The surface is provided with a protrusion that abuts on the tooth portion, and the protrusion is provided only on a portion of the surface in a direction perpendicular to the insertion direction of the insulator.

  Moreover, in the insulator, it is preferable that a plurality of the protruding portions are provided in a direction perpendicular to the inserting direction of the insulator.

  Further, the present invention is a stator of a rotating electrical machine including an insulator that is fitted and disposed on an outer periphery of a tooth portion that protrudes in a radial direction from an annular yoke portion, and the insulator includes a plurality of pieces facing the teeth portion. A protrusion that abuts against the teeth portion is provided on at least one of the surfaces, and the protrusion is provided only in a part of the surface in a direction orthogonal to the insertion direction of the insulator. .

  Moreover, in the stator of the rotating electrical machine, it is preferable that a plurality of the projecting portions are provided in a direction perpendicular to the inserting direction of the insulator.

  Moreover, in the stator of the rotating electrical machine, it is preferable that a coil is disposed on the outer periphery of the insulator.

  Further, the present invention is a rotating electrical machine including a stator of a rotating electrical machine including an insulator that is fitted and arranged on an outer periphery of a tooth portion that protrudes in a radial direction from an annular yoke portion, and the insulator is attached to the teeth portion. A plurality of opposing surfaces are provided, and at least one of the surfaces is provided with a protruding portion that contacts the teeth portion, and the protruding portion is a part of the surface in a direction perpendicular to the insertion direction of the insulator. It is provided only in

  In the rotating electrical machine, it is preferable that a plurality of the projecting portions be provided in a direction orthogonal to the insertion direction of the insulator.

  In the rotating electrical machine, it is preferable that a coil is disposed on the outer periphery of the insulator.

  According to the present invention, the insulator is fitted and arranged on the outer periphery of the tooth portion protruding in the radial direction from the annular yoke portion, and the insulator includes a plurality of surfaces facing the teeth portion, and is at least one of them. Assembling of the insulator is provided by providing a protruding portion that comes into contact with the tooth portion on one surface, and the protruding portion is provided only in a part of the surface in a direction orthogonal to the inserting direction of the insulator. It is possible to provide an insulator capable of suppressing the occurrence of play, a stator including the insulator, and a rotating electrical machine including the stator.

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic diagram illustrating an example of the configuration of the rotating electrical machine according to the present embodiment. The rotating electrical machine is not particularly limited, such as a pulse motor such as an AC motor, an SR motor, or a claw pole type motor. As shown in FIG. 1, the rotating electrical machine 1 includes a stator 10, a rotor 12, a stator 10, and a frame (not shown) that accommodates the rotor 12. The stator 10 is fixed inside the frame.

  The rotor 12 includes a shaft 14 and a rotor core 16. As shown in FIG. 1, the rotor 12 has a rotor core 16 fixed around a shaft 14 disposed in the center. Further, the rotor 12 is inserted and arranged so as to have a predetermined gap between the rotor 12 and the stator 10.

  The rotor core 16 is provided with a plurality of permanent magnets (18a, 18b...). Further, the rotor core 16 is configured by laminating and integrating a plurality of the above-described electromagnetic steel sheets punched by a pressing device. The shaft 14 is supported on the frame body via a bearing (not shown).

  Next, the stator according to this embodiment will be described.

  FIG. 2 is a partial schematic plan view showing an example of the configuration of the stator according to the embodiment of the present invention. FIG. 3 is a partial schematic perspective view showing an example of the configuration of the stator according to the embodiment of the present invention. As shown in FIGS. 2 and 3, the stator 10 includes a stator core 20, a coil 22, and an insulator 24.

  The stator core 20 includes an annular yoke portion 26 and teeth portions 28 (28a, 28b... Shown in FIG. 1) protruding in the radial direction of the yoke portion 26.

  FIG. 4 is a schematic perspective view showing an example of the configuration of the insulator of the present embodiment. As shown in FIG. 4, the insulator 24 has a fitting insertion hole 30, a storage portion 32, a flange portion 34, and a protruding portion 36. In the accommodating portion 32, a coil 22 (FIGS. 2 and 3) having a predetermined number of windings is disposed. Further, the tooth portion 28 (FIGS. 2 and 3) is inserted into the insertion hole 30. The flange portion 34 is for preventing the coil 22 from falling off the insulator 24.

  FIG. 5 is a schematic cross-sectional view of the insulator at a cut surface passing through the line AA in FIG. 4. FIG. 6 is a schematic cross-sectional view of the insulator at a cut surface passing through line BB in FIG. 4. The projecting portion 36 abuts the tooth portion 28 on at least one of the side surface of the insulator 24 on the tooth portion 28 side, that is, the side surface of the insulator 24 on the fitting insertion hole 30 side. In the direction perpendicular to the direction in which the insulator 24 is inserted, it is provided only on a part of the side surface. Here, in the direction orthogonal to the direction in which the insulator 24 is inserted and inserted, the protrusion 36 is provided from the end portion of the side surface of the insulator 24 to the other end portion of the same side surface. It is not a thing, but is provided in a part from the edge part of a side surface to the other end part of the same side surface. That is, for example, as shown in FIG. 5, when the protruding portion 36 is provided on the side surface 38, the radial direction of the stator (arrow Z shown in FIG. 5) is directed from the end 38 a of the side surface 38 shown in FIG. 5. It is not provided over the other end portion 38b from the end portion 38c of the side surface 38 shown in FIG. 6 to the other end portion 38d extending in the axial direction of the stator (arrow Y shown in FIG. 6). The shape or the like of the protruding portion 36 is not particularly limited.

  Further, the protruding portion 36 is a side surface of the insulator 24 on the fitting insertion hole 30 side, and a pair of opposing side surfaces (for example, as shown in FIG. 5, in the circumferential direction of the stator (arrow X shown in FIG. 5)). A pair of side surfaces 38 facing each other, as shown in FIG. 6, a pair of side surfaces 40 facing the axial direction of the stator (arrow Y shown in FIG. 6), and at least one of the pair of insulators 24 facing each other It is preferable that it is provided only in a part of. In addition, the pair of side surfaces 38 that face the circumferential direction of the stator (arrow X shown in FIG. 5) are fixed to the engaging portion (described later) of the teeth portion that can suppress the occurrence of assembly play. It is preferable to be provided only in part.

  FIG. 7 is a schematic perspective view showing another example of the configuration of the insulator of the present embodiment. FIG. 8 is a schematic cross-sectional view of the insulator at a cut surface passing through the line BB in FIG. 7. In the present embodiment, the protrusions 36 are a pair of side surfaces 38 facing the circumferential direction of the stator, and are provided at end portions close to the pair of side surfaces 40 (40c, 40d) facing the axial direction of the stator. It has been. With such a configuration, the coil 22 is disposed in the accommodating portion 32 of the insulator 24, whereby deformation, inclination, and the like of the insulator 24 can be suppressed.

  By inserting the tooth part 28 into the insertion hole 30 of the insulator 24, the insulator 24 is disposed on the outer periphery of the tooth part 28.

  FIG. 9 is a schematic cross-sectional view of the stator at a cut surface passing through the line AA shown in FIG. 3. As shown in FIG. 9, the teeth portion 28 is provided with a locking portion 42 that locks the protruding portion 36 of the insulator 24 when the insulator 24 is disposed. The locking portion 42 locks the protruding portion 36 of the insulator 24, so that the insulator 24 can be fixed to the tooth portion 28 and assembly of the insulator 24 can be suppressed. Further, as described above, since the protruding portion 36 is provided on a part of the side surface of the insulator 24, the contact area with the tooth portion 28 is small, and the insulator 24 given when the tooth portion 28 is inserted and inserted. It is possible to reduce the insertion load on. Therefore, by providing the protruding portion 36 and the locking portion 42 of the present embodiment, the insulator 24 can be fixed and assembly backlash can be suppressed. Further, if the assembly backlash can be suppressed, it is not necessary to secure a space in consideration of the backlash and the motor can be downsized.

  The locking part 42 locks the protruding part 36 of the insulator 24. Specifically, in a state where the tooth portion 28 is fitted and inserted into the insulator 24, a part of the locking portion 42 is locked by coming into contact with the radially inner surface of the stator of the protruding portion 36. As a result, the size management of the assembly position of the insulator 24 can be facilitated. Further, the position of the locking portion 42 is provided at a position inward of the stator in the radial direction (arrow Z shown in FIG. 9) from the protruding portion 36 provided on the insulator 24 and in contact with the protruding portion 36. By providing the locking portion 42 and the protruding portion 36 on the distal end side of the tooth portion 28, it is possible to shorten a section where the insertion load of the tooth portion is high.

  The distance L3 between the top surfaces of the projecting portions 36 shown in FIG. 9 is preferably smaller than the width L4 of the teeth portion 28 located on the radially inner side of the stator from the locking portion 42. As a result, when the protruding portion 36 is locked to the tooth portion 28, it becomes possible for an operator or the like to recognize a moderation feeling when the insertion load applied to the insulator 24 is released, and an assembly error of the insulator 24 is made. Can be prevented.

  Next, an example of the structure of the stator which concerns on other embodiment of this invention is demonstrated.

  FIG. 10 is a partial schematic perspective view showing an example of the configuration of a stator according to another embodiment of the present invention. As shown in FIG. 10, the stator 44 includes a stator core 20, a coil 22, and an insulator 46. In addition, in the stator 44 shown in FIG. 10, the same code | symbol is attached | subjected about the structure similar to the stator 10 shown in FIG.

  FIG. 11 is a schematic perspective view showing an example of the configuration of an insulator according to another embodiment of the present invention. As shown in FIG. 11, the insulator 46 includes the fitting insertion hole 30, the accommodating portion 32, the flange portion 34, and the protruding portions 36 a and 36 b. The accommodating part 32, the fitting insertion hole 30, and the collar part 34 are the same as the above.

  12 is a schematic cross-sectional view of the insulator at a cut surface passing through the line AA in FIG. 11, and FIG. 13 is a schematic cross-sectional view of the insulator at the cut surface through the line BB in FIG. As shown in FIGS. 12 and 13, the protrusions 36 a and 36 b are provided with protrusions that come into contact with the tooth part 28 on all side surfaces of the insulator 46 on the tooth part 28 side, and go straight in the insertion direction of the insulator 46. In the direction, it is provided only on a part of the side surface. The part of the side surface here is as described above.

  The projecting portion of the present embodiment has a pair of projecting portions facing each other, with at least one of the projecting portions (36a, 36b) facing each other being locked by the locking portion of the tooth portion described above. Among (36a, 36b), the distance between the top surfaces of at least one of the pair of protrusions is smaller than the thickness of the tooth portion. In the present embodiment, for example, the protrusions 36 a provided on the pair of side surfaces 38 facing the circumferential direction of the stator shown in FIG. 12 (arrow X shown in FIG. 12) are the locking portions 42 ( For example, see FIG. Further, the distance between the top surfaces of the protrusions 36b provided on the pair of side surfaces 40 (40c, 40d) facing the axial direction of the stator shown in FIG. 13 (arrow Y shown in FIG. 13) is inserted. It is smaller than the thickness of the tooth portion 28. Although this will be described below as an example, the present invention is not limited to this, and the protrusions 36a and 36b may be reversed, and both the protrusions 36a and 36b are locked by the locking part 42 of the teeth part 28. In addition, the distance between the top surfaces of the protruding portions 36 a and 36 b may be smaller than the thickness of the tooth portion 28.

  As described above, the protruding portions 36a provided on the pair of side surfaces of the insulator facing the circumferential direction of the stator are, for example, the locking portions 42 provided on the tooth portion 28 as shown in FIG. It is locked by.

  FIG. 14 is a schematic cross-sectional view of the insulator and the tooth portion showing a state before the tooth portion is fitted into the insulator. As shown in FIG. 14, the distance L1 between the top surfaces of the protrusions 36b provided on the pair of side surfaces 40 (40c, 40d) of the insulator 46 facing the axial direction of the stator is the teeth between the protrusions 36b. It is smaller than the thickness L2 of the portion 28. By making the distance L1 between the top surfaces of the projecting portions 36b smaller than the thickness L2 of the tooth portion 28, a pressing force (in this embodiment, a pressing force in the axial direction of the stator 10) is applied to the tooth portion 28. Then, the teeth portion (for example, the laminated electromagnetic steel sheet in an open state) is pressed and adhered, and in the insulator 46, the assembly backlash in the axial direction of the stator 10 (arrow Y shown in FIG. 14) can be suppressed. . Furthermore, since the protrusion part 36b is provided in a part of side surface of the insulator 46, when inserting the teeth part 28, the insertion load applied to the insulator 46 can be reduced. Therefore, the assembly play can be suppressed by providing the projecting portions 36a and 36b and the locking portion 42 of the present embodiment. Further, if the assembly backlash can be suppressed, it is not necessary to secure a space in consideration of the backlash and the motor can be downsized.

  The material constituting the insulator (and the protruding portion) is not particularly limited as long as it has non-magnetic properties and insulating properties. For example, a resin such as polybutylene terephthalate, polyphenylene sulfide, or nylon may be used. However, resin selection, shape design, etc. are not particularly limited.

  The coil 22 used in the present embodiment is formed by winding a normal winding (a winding has a circular cross-sectional shape), a rectangular wire (a winding has a square cross-sectional shape), or the like. Copper or the like can be used as a material for ordinary windings and rectangular wires.

  The stator core 20 used in the present embodiment is not particularly limited even if the annular yoke portion and the teeth portion are integrally formed, or even if the divided stator cores divided into a plurality are annularly arranged. Absent. When the stator core is obtained by arranging the split stator core in an annular shape, it is obtained by providing a nonmagnetic ring on the outer peripheral surface of the yoke portion and shrink fitting.

  The yoke part 26 and the teeth part 28 used in the present embodiment are not particularly limited as long as they are a laminated body in which electromagnetic steel plates are laminated, a compact of a magnetic powder material, or the like.

  Examples of the dust magnetic material used in this embodiment include Fe such as pure Fe, Fe—Si, Fe—Co, Fe—Cr, Fe—Cr—Ni, and Fe—Si—Al. Examples thereof include particles of a system metal (alloy).

  Furthermore, the dust magnetic material may be one in which an insulating agent such as a silicon resin or a phenol resin is contained in the above-described particles or the like.

  Next, the operation of the rotating electrical machine 1 according to the present embodiment will be described with reference to FIG. For example, when a current is passed through a coil (not shown) provided in the tooth portion 28a of the stator 10, a magnetic flux flows from the nearest permanent magnet 18a to the tooth portion 28a in the tooth portion 28a, and the permanent magnet 18a becomes the teeth portion. Attracted to 28a. Further, by passing a current through a coil (not shown) of another tooth portion 28b, the permanent magnet 18b closest to the other tooth portion 28b is attracted to the tooth portion 28b. By performing this continuously, the rotor 12 rotates and torque is generated.

  As described above, the rotary electric machine 1 according to the present embodiment has been described with reference to FIG. 1, but the configuration of the rotary electric machine is not limited to this, and for example, an embedded motor in which a permanent magnet is embedded in a rotor core or the like. Even if there is a design change within a scope not departing from the gist of the present invention, they are included in the present invention.

It is a schematic diagram which shows an example of a structure of the rotary electric machine which concerns on this embodiment. It is a partial schematic plan view which shows an example of a structure of the stator which concerns on embodiment of this invention. It is a partial schematic perspective view which shows an example of a structure of the stator which concerns on embodiment of this invention. It is a model perspective view which shows an example of a structure of the insulator of this embodiment. It is a schematic cross section of the insulator in the cut surface which passes along the AA line of FIG. It is a schematic cross section of the insulator in the cut surface which passes along the BB line of FIG. It is a model perspective view which shows another example of a structure of the insulator of this embodiment. It is a schematic cross section of the insulator in the cut surface which passes the BB line of FIG. It is a schematic cross section of the stator in the cut surface which passes along the AA line shown in FIG. It is a partial model perspective view which shows an example of a structure of the stator which concerns on other embodiment of this invention. It is a model perspective view which shows an example of a structure of the insulator which concerns on other embodiment of this invention. It is a schematic cross section of the insulator in the cut surface which passes along the AA line of FIG. It is a schematic cross section of the insulator in the cut surface which passes the BB line of FIG. It is a schematic cross section of an insulator and a tooth portion showing a state before the tooth portion is inserted into the insulator. It is a partial schematic plan view which shows the structure of the stator used for an electric motor. It is a model perspective view which shows an example of a structure of the general insulator used for a stator.

Explanation of symbols

  1 Rotating machine 10, 44, 48 Stator, 12 Rotor, 14 Shaft, 16 Rotor core, 18a, 18b Permanent magnet, 20, 49 Stator core, 22, 54 Coil, 24, 46, 56 Insulator, 26 , 50 Yoke part, 28, 52 Teeth part, 30, 58 fitting hole, 32, 60 accommodating part, 34, 62 collar part, 36, 36a, 36b Protruding part, 38, 40, 40c, 40d Side face, 38a, 38b , 38c, 38d end, 42 locking part.

Claims (8)

An insulator that is fitted and arranged on an outer periphery of a teeth portion that protrudes in a radial direction from an annular yoke portion,
The insulator includes a plurality of surfaces facing the teeth portion, and at least one of the surfaces is provided with a protruding portion that comes into contact with the teeth portion, and the protruding portion is a direction perpendicular to the inserting direction of the insulator. And the insulator is provided only in a part of the surface.   2. The insulator according to claim 1, wherein a plurality of the projecting portions are provided in a direction perpendicular to the insertion direction of the insulator. A stator of a rotating electrical machine including an insulator fitted and arranged on an outer periphery of a teeth portion protruding in a radial direction from an annular yoke portion,
The insulator includes a plurality of surfaces opposed to the teeth portion, and at least one of the surfaces is provided with a protruding portion that comes into contact with the teeth portion, and the protruding portion is a direction perpendicular to the inserting direction of the insulator. A stator for a rotating electrical machine, wherein the stator is provided only in a part of the surface.   The stator of a rotating electrical machine according to claim 3, wherein a plurality of the projecting portions are provided in a direction orthogonal to the inserting direction of the insulator.   The stator for a rotating electrical machine according to claim 3 or 4, wherein a coil is disposed on an outer periphery of the insulator. A rotating electrical machine including a stator of a rotating electrical machine including an insulator fitted and disposed on an outer periphery of a tooth portion protruding in a radial direction from an annular yoke portion,
The insulator includes a plurality of surfaces opposed to the teeth portion, and at least one of the surfaces is provided with a protruding portion that comes into contact with the teeth portion, and the protruding portion is a direction perpendicular to the inserting direction of the insulator. The rotating electrical machine is provided only in a part of the plane.   7. The rotating electrical machine according to claim 6, wherein a plurality of the projecting portions are provided in a direction perpendicular to the inserting direction of the insulator.   The rotating electrical machine according to claim 6 or 7, wherein a coil is disposed on an outer periphery of the insulator.

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