JP5151300B2 - Stator and rotating electric machine - Google Patents

Description

  The present invention relates to a stator and a rotating electrical machine, and more particularly to a stator provided with insulating paper between a tooth portion and a stator coil, and a rotating electrical machine including the stator.

  Japanese Patent Laid-Open No. 2001-28849 (Patent Document 1) describes that a chamfered portion is provided at an axial end portion of a slot of a stator core in order to prevent the insulator from being damaged.

  Japanese Patent Application Laid-Open No. 58-54856 (Patent Document 2) describes that after a thermosetting resin powder is attached to the end face of a stator, the resin is heat-cured.

  Japanese Patent Application Laid-Open No. 55-46853 (Patent Document 3) describes that a plastic covering plate is fixed to both ends of a laminated plate constituting a stator.

Japanese Patent Application Laid-Open No. 2004-274858 (Patent Document 4) and Japanese Patent Application Laid-Open No. 2003-143791 (Patent Document 5) describe that a curved member is provided on the axial end surface of the stator core.
JP 2001-28849 A JP 58-54856 A JP 55-46853 A JP 2004-274858 A JP 2003-143791 A

  In a general rotating electrical machine, in order to ensure insulation between the stator coil and the stator core, insulating paper is provided between them. When the stator coil winding inserted in the slot portion of the stator core is bent, the insulating paper is sandwiched between the winding and the corner portion of the stator core, and a force for tearing the insulating paper is generated. In order to ensure insulation between the stator coil and the stator core, it is required to suppress damage to the insulating paper due to this force.

  Note that Patent Documents 1 to 5 are not necessarily sufficient from the viewpoint of suppressing damage to insulating paper. Specifically, for example, in Patent Documents 1 to 5, since the axial end of the stator core is not deformed along with the winding of the stator coil, the insulating paper is sandwiched between the winding and the stator core. As a result, a large force may locally act on the insulating paper.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator in which damage to insulating paper is suppressed and a rotating electrical machine including the stator.

  The stator according to the present invention includes a stator core having a tooth portion, a stator coil wound around the tooth portion, and insulating paper provided between the tooth portion and the stator coil.

In one aspect, the stator is provided at an end portion in the axial direction of the tooth portion, and is deformable by winding a stator coil around the tooth portion, and increases an area of a portion to which the insulating paper is pressed. Further comprising a soft part . In this aspect, the soft portion is formed by providing a member softer than the stator core at the axial end of the stator core, and the stator coil is inserted into the stator core along the axial direction of the stator core, and then the conductive wire is inserted into the stator core. It is wound around the teeth part by bending.

In another aspect, the stator further comprises provided in the axial end portion of the tooth portion, the insulating paper softness rather than the soft portion to increase the area of the devoted site push insulating paper.

  According to the above configuration, in any aspect, due to the cushion effect of the soft portion, it is possible to suppress the insulating paper from being pressed against the corners of the stator core by the wound coil and being damaged.

In the other aspect, as an example, in the stator, the soft portion is formed by providing a member softer than the stator core at the axial end of the stator core.

  As another example, in the stator, the soft portion is formed by applying resin coating to at least an axial end portion of the tooth portion.

  According to the above configuration, in any aspect, with a simple configuration, it is possible to obtain a soft portion that can be deformed by winding the stator coil around the tooth portion, or a soft portion that is softer than the insulating paper.

In the other aspect described above, preferably, the stator coil is wound around the teeth portion by inserting a conducting wire into the stator core along the axial direction of the stator core and then bending the conducting wire.

  According to the said structure, the space factor of the conducting wire in a stator can be improved. In such a configuration, it is particularly necessary to consider the damage to the insulating paper. However, according to the stator according to the present invention, the above-described soft portion is provided to suppress the damage to the insulating paper.

  A rotating electrical machine according to the present invention includes the above-described stator. Thereby, the rotary electric machine with which the damage of the insulating paper of the stator was suppressed is provided.

  According to the present invention, in the stator, it is possible to suppress damage to the insulating paper provided between the tooth portion and the stator coil.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the configurations of the embodiments unless otherwise specified.

  FIG. 1 is a sectional view showing an example of a rotating electrical machine having a stator according to one embodiment of the present invention. Referring to FIG. 1, rotating electrical machine 100 includes a control device 10, a three-phase cable 20, a shaft 30, a rotor 40, and a stator 50.

  The rotor 40 includes a rotor core 41 and a permanent magnet 42. Stator 50 includes a stator coil 51 and a stator core 52.

  The control device 10 receives a torque command value TR to be output by the rotating electrical machine 100 from an ECU (Electrical Control Unit) provided outside the rotating electrical machine 100, and outputs the torque specified by the received torque command value TR. Motor control current is generated, and the generated motor control current is supplied to the stator coil 51 of the stator 50 via the three-phase cable 20.

  The three-phase cable 20 connects the control device 10 and the stator coil 51. The three-phase cable 20 includes a U-phase cable 21, a V-phase cable 22, and a W-phase cable 23. The shaft 30 is inserted into the rotor core 41 of the rotor 40 from the rotation axis direction DR <b> 1 and is connected to the rotor core 41. The rotor core 41 has a structure in which a plurality of electromagnetic steel plates are laminated in the rotation axis direction DR1. The magnet 42 is inserted into the rotor core 41 from the rotation axis direction DR1.

  The stator core 52 of the stator 50 has a structure in which a plurality of electromagnetic steel plates are laminated in the rotation axis direction DR1. The stator coil 51 is wound around the stator core 52. Stator coil 51 includes a U-phase coil, a V-phase coil, and a W-phase coil, and the terminals of these three coils are connected to three-phase cable 20.

  The stator according to the present embodiment employs an SC (Segment Conductor) winding structure. The SC winding structure is a winding structure in which a divided conducting wire called a segment conductor is inserted into the slot portion of the stator core along the axial direction (arrow DR1 direction), and then the conducting wire is bent and wound around a tooth.

  FIG. 2 is a development view of the inner peripheral surface of the stator 50. The structure of the SC winding included in the stator 50 will be described with reference to FIG. In the example of FIG. 2, a substantially U-shaped divided conducting wire constituting the coil 510 is inserted into the stator core 52 so as to sandwich the teeth 1 to 5 from the direction of arrow A, and then the divided conducting wire is bent in the direction of arrow DR510. It is done. By adopting such a winding structure, the space factor of the conducting wire in the stator can be improved. In the present embodiment, as shown in FIG. 3 (III-III cross-sectional view in FIG. 2), a split conducting wire having a square cross-sectional shape is used. By doing in this way, the space factor of the conducting wire in the stator 52 can further be improved.

  On the other hand, by adopting the SC winding structure as shown in FIGS. 2 and 3, the insulating paper 53 is easily sandwiched between the teeth portion of the stator core 52 and the winding when the winding is bent. In this case, for example, as shown in FIG. 7, the insulating paper 53 sandwiched between the stator core 52 and the coil 510 may be torn (α portion in FIG. 7). Therefore, when the SC winding structure is adopted, it is particularly necessary to consider damage to the insulating paper 53 when the stator coil 51 is wound.

  When the insulating paper 53 is damaged due to the pinching described above, the insulation between the stator coil 51 and the stator core 52 is not maintained. If it is attempted to prevent this phenomenon only by selecting the thickness and material of the insulating paper 53, the manufacturing cost of the stator increases.

  Further, as shown in FIG. 8, when the bending position of the coil 510 is separated from the axial end of the stator core 52 (see FIG. 8B), the coil 510 is bent near the axial direction of the stator core 52 (FIG. 8). Compared to (a), the physique of the stator is increased by L.

  The inventor of the present application has studied a structure that can suppress damage to the insulating paper 53 without excessively increasing the manufacturing cost and without excessively increasing the size of the stator.

  FIG. 4 is a view showing an example of the structure around the teeth in the stator 50 according to the present embodiment. Here, FIG. 4A shows a state before the winding constituting the coil 510 is bent, and FIG. 4B shows a state after the winding is bent.

  In the example of FIG. 4, the resin coating portion 54 </ b> A is provided by applying resin coating to the axial end portion of the teeth in the stator core 52. By providing such a resin coating portion 54A, when the coil 510 is bent in the direction of the arrow DR510, the area of the portion to which the insulating paper 53 is pressed increases, and the tearing force acting on the insulating paper 53 decreases. To do. A resin tape or the like may be used instead of the resin coating portion 54A.

  FIG. 5 is a view showing another example of the structure around the teeth in the stator 50 according to the present embodiment. Here, FIG. 5A shows a state before the winding constituting the coil 510 is bent, and FIG. 5B shows a state after the winding is bent.

  In the example of FIG. 5, among the laminates constituting the stator core 52, one (or several) laminates positioned at the axial end of the stator core 52 are softer than the other laminates (electromagnetic steel plates). It is set as the soft member 54B comprised by these. By providing such a soft member 54B, when the coil 510 is bent in the direction of the arrow DR510, the soft member 54B is deformed and the area of the portion to which the insulating paper 53 is pressed increases, and the insulating paper 53 The tearing force acting on the is reduced.

  The thickness of the electromagnetic steel sheet, the insulating paper 53, the resin coating portion 54A, and the soft member 54B that constitute the stator core 52 is appropriately changed. The thickness of the electromagnetic steel sheet constituting the stator core 52 is, for example, about 0.3 mm to 0.5 mm, and the thickness of the insulating paper 53 is, for example, about 0.25 mm to 0.3 mm. The resin coating portion 54A and the soft member 54B are provided. Is about 0.5 mm to 2 mm, for example.

  4 and 5, the insulating paper 53 is made of, for example, polyamide resin (with glass fiber), polyethylene terephthalate, polyacetal, or the like. On the other hand, the resin coating portion 54A and the soft member 54B are made of a soft resin (for example, polyurethane resin) softer than the insulating paper 53. The soft member 54B may be made of aluminum or rubber.

  As described above, by providing the resin coating portion 54A and the soft member 54B that are softer than the insulating paper 53, the resin coating portion 54A and the soft member 54B are deformed along the bent shape of the coil 510, and the insulating paper 53 is locally localized. It is possible to suppress being pinched strongly (cushion effect). As a result, damage to the insulating paper 53 is suppressed.

  An insulating film is formed on the surface of the winding constituting the coil 510. When the winding of the coil 510 is bent, “wrinkles” are formed in the insulating film located inside the bent portion. The “wrinkles” become protrusions and press the insulating paper 53. As described above, by providing the resin coating portion 54A and the soft member 54B that are softer than the insulating paper 53, the deformation of the insulating paper 53 due to “wrinkles” of the insulating film is absorbed. As a result, the tearing force acting on the insulating paper 53 is reduced, and damage to the insulating paper 53 is suppressed.

  FIG. 6 is a view showing still another example of the structure around the teeth in the stator 50 according to the present embodiment.

  In the example of FIG. 6, the width of the electromagnetic steel sheet 52B located at the axial end of the stator core 52 formed by stacking electromagnetic steel sheets is narrower than the width of the other electromagnetic steel sheets 52A. By doing in this way, when the coil 510 is bent in the direction of the arrow DR510, the place where the insulating paper 53 contacts the stator core 52 (that is, the place where the insulating paper 53 is sandwiched between the coil 510 and the stator core 52) There are a plurality (two in the example of FIG. 6). As a result, the tearing force acting on the insulating paper 53 is reduced, and damage to the insulating paper 53 is suppressed.

  The above contents are summarized as follows. That is, the stator 50 according to the present embodiment includes a stator core 52 having teeth 1 to 5 as “tooth portions”, a coil 510 (stator coil 51) wound around the teeth 1 to 5, and teeth 1 to 5. And an insulating paper 53 provided between the coil 510 and the coil 510.

  In the example of FIG. 4, a resin coating portion 54 </ b> A as a “soft portion” is provided at the axial ends of the teeth 1 to 5 in the stator 50. On the other hand, in the example of FIG. 5, a soft member 54 </ b> B as a “soft part” is provided at the axial end of the teeth 1 to 5 of the stator 50.

  The resin coating portion 54 </ b> A and the soft member 54 </ b> B can be deformed by winding the coil 510 around the teeth 1 to 5 and are softer than the insulating paper 53.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is sectional drawing which showed an example of the rotary electric machine which has the stator which concerns on one embodiment of this invention. It is a figure explaining the structure of SC winding contained in the stator concerning one embodiment of the present invention. It is the III-III sectional view in FIG. It is a figure which shows an example of the structure of the teeth part periphery in the stator which concerns on one embodiment of this invention, Fig.4 (a) shows the state before bending SC winding, FIG.4 (b) is SC winding. The state after bending a line is shown. It is a figure which shows the other example of the structure of the teeth part periphery in the stator which concerns on one embodiment of this invention, Fig.5 (a) shows the state before bending SC winding, FIG.5 (b) The state after bending SC winding is shown. It is a figure which shows the further another example of the structure of the teeth part periphery in the stator which concerns on one embodiment of this invention. It is a figure which shows the structure of the teeth part periphery in the stator which concerns on one comparative example. It is a figure which shows the structure of the teeth part periphery in the stator which concerns on another comparative example.

Explanation of symbols

  1 to 5 teeth, 10 control device, 20 three-phase cable, 21 U-phase cable, 22 V-phase cable, 23 W-phase cable, 30 shaft, 40 rotor, 41 rotor core, 42 permanent magnet, 50 stator, 51 stator coil, 52 Stator core, 52A, 52B electromagnetic steel sheet, 53 insulating paper, 54A resin coating, 54B soft member, 100 rotating electrical machine, 510 coil.

Claims (6)

A stator core having a teeth portion;
A stator coil wound around the teeth portion;
Insulating paper provided between the teeth portion and the stator coil;
A soft portion that is provided at an end portion in the axial direction of the tooth portion and can be deformed by winding the stator coil around the tooth portion and increases an area of a portion to which the insulating paper is pressed. ,
The soft portion is formed by providing a member softer than the stator core at the axial end of the stator core,
The stator coil is wound around the teeth portion by inserting a conducting wire into the stator core along the axial direction of the stator core and then bending the conducting wire . A stator core having a teeth portion;
A stator coil wound around the teeth portion;
Insulating paper provided between the teeth portion and the stator coil;
Wherein provided at an axial end of the teeth, the insulating paper softer rather than, and a soft segment to increase the area of the insulating paper is pushed against which sites stator. The stator according to claim 2 , wherein the soft portion is formed by providing a member softer than the stator core at an axial end portion of the stator core.   The stator according to claim 1, wherein the soft portion is formed by applying resin coating to at least an axial end portion of the tooth portion. 4. The stator according to claim 2 , wherein the stator coil is wound around the teeth portion by inserting a conducting wire into the stator core along the axial direction of the stator core and then bending the conducting wire. 5.   A rotating electrical machine comprising the stator according to any one of claims 1 to 5.

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