JP2010172164A - Structure of resolver stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem associated with the conventional structure of a resolver stator wherein a ring stator core is fixed to a case member by thermal press fit and therefore the ring stator core cannot be firmly fixed to the case member due to a great impact by a big difference in coefficient of linear expansion. <P>SOLUTION: In a structure of a resolver stator, a through-hole 24 is formed in a projecting support body 21 provided in a case member 20 and a rivet 30 is inserted through the through-hole 24. A cylindrical leading edge part 33 of the rivet 30 is expanded to form a flange-like deformed portion 33a at the second end face 10b side of the stator. A ring stator core 10 is held between the flange-like deformed portion 33a and a supporting face 21b in the axis direction of the projecting support body 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resolver stator structure, and in particular, by holding a ring-shaped stator iron core between a flange-shaped deformed portion of a rivet and an axial support surface of a projecting support provided on a case member, the linear expansion coefficient is increased. The present invention relates to a novel improvement that can reduce the influence of the difference and more firmly fix the annular stator core to the case member.

  As this type of resolver stator structure conventionally used, for example, a resolver stator structure shown in Patent Document 1 is used. That is, in the conventional resolver stator structure, the annular stator iron core is fixed to the case member by hot press fitting or caulking.

JP 10-309068 A

  In the conventional resolver stator structure as described above, the ring-shaped stator core is fixed to the case member by hot press fitting. Therefore, when the case member is formed of an aluminum alloy such as ADC12, the ring-shaped stator core formed of iron is used. It is greatly affected by the difference in the linear expansion coefficient and the heat injection becomes difficult. That is, it is difficult to fix the annular stator core firmly to the case member by fixing by hot press fitting. In addition, since ADC12 has almost no elongation characteristic, it is difficult to fix it by caulking.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a resolver stator structure that can reduce the influence due to the difference in linear expansion coefficient and can more firmly fix the annular stator core to the case member. Is to provide.

  A resolver stator structure according to the present invention is provided at both ends of a ring-shaped stator core having a plurality of magnetic poles projecting radially inward from each other at intervals in the circumferential direction, and the ring-shaped stator core along the axial direction. First and second stator end faces, a case member disposed radially outward of the annular stator core, a projecting support projecting radially inward from an inner peripheral surface of the case member, and the projecting support An axial support surface that contacts the first stator end surface along the axial direction, a through hole provided in the projecting support, and from the first stator end surface side to the second stator end surface side. And a rivet inserted through the through-hole, and a flange-shaped deformed portion is formed on the second stator end face side by expanding the cylindrical tip of the rivet. The annular stator core part and by the said axial support surface is held.

  According to the resolver stator structure of the present invention, the ring-shaped stator core is sandwiched between the flange-shaped deformed portion of the rivet and the axial support surface of the protruding support provided on the case member, so that the influence due to the difference in linear expansion coefficient is reduced. The ring-shaped stator iron core can be more firmly fixed to the case member.

It is a front view which shows the resolver stator structure by Embodiment 1 of this invention. It is a rear view which shows the resolver stator structure of FIG. It is sectional drawing which follows the line III-III of FIG. It is sectional drawing which expands and shows the area | region IV of FIG.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a front view showing a resolver stator structure according to Embodiment 1 of the present invention, FIG. 2 is a rear view showing the resolver stator structure of FIG. 1, and FIG. 3 is a cross section taken along line III-III of FIG. FIG. 4 is an enlarged sectional view showing a region IV in FIG.
As shown in FIGS. 1 to 3, the laminated ring-shaped stator core 10 is provided with a plurality of magnetic poles 11 projecting inward in the radial direction D at intervals in the circumferential direction C. A first stator end surface 10a (see FIG. 1) and a second stator end surface 10b (see FIG. 2) are provided at both ends of the annular stator core 10 along the axial direction A. These first and second stator end surfaces 10a. , 10b are attached with a first annular insulating cover member 12 (see FIG. 1) and a second annular insulating cover member 13 (see FIG. 2) for insulating each magnetic pole 11 and stator winding (not shown). It has been. The first and second ring-shaped insulating cover members 12 and 13 are provided integrally with each other by known insert molding. The first and second annular insulating cover members 12 and 13 may be provided separately from each other and assembled so as to sandwich the annular stator core 10 from both the front and back surfaces of the annular stator core 10.

  The first annular insulating cover member 12 is integrally provided with a terminal holding portion 12a that protrudes from the annular stator iron core 10 along the radial direction D. The terminal holding portion 12a has a plurality of terminal pins 14. Is retained. The terminal pin 14 is provided so as to penetrate the terminal holding portion 12a. One end of the terminal pin 14 is connected to an end line of the stator winding, and the other end of the terminal pin 14 is a lead wire (not shown). Is connected. As is well known, the lead wire is used to input an excitation signal and to output a resolver signal (sin phase signal: sin θ · sin ωt and cos phase signal: cos θ · sin ωt) according to the rotation of the rotor.

  As shown in FIG. 3, a cylindrical case member 20 is disposed outside the radial stator core 10 in the radial direction D. The case member 20 is formed of a material having a high thermal conductivity such as ADC12, for example, and can efficiently release the heat generated in the stator winding and the annular stator core 10.

  An annular projecting support body 21 projecting inward in the radial direction D from the inner peripheral surface 20a of the case member 20 is provided at a substantially central position of the case member 20 along the axial direction A. As shown in FIG. 4, the projecting support 21 has a first projecting portion 22 and a second projecting portion 23 projecting inward in the radial direction D from the first projecting portion 22. It is formed in an L shape. The inner peripheral surface of the first protrusion 22 is in contact with the stator outer peripheral surface 10 c of the annular stator core 10, and constitutes a radial support surface 21 a that supports the annular stator core 10 along the radial direction D. The side surface of the 2nd protrusion part 23 is in contact with the 1st stator end surface 10a of the ring-shaped stator iron core 10, and the axial direction support surface which supports the ring-shaped stator iron core 10 along the axial direction A with the flange-shaped deformation part 33a mentioned later. 21b is constituted.

  The protruding support 21 is provided with a through hole 24, and a rivet 30 is inserted into the through hole 24 from the first stator end surface 10 a side to the second stator end surface 10 b side. As is well known, the rivet 30 includes a rivet head 31, a shaft portion 32, and a cylindrical tip portion 33. The rivet head 31 has a large-diameter head storage hole 23a provided in the second protrusion 23. Is stored inside. As shown by the one-dot chain line in FIG. 4, the cylindrical tip 33 protrudes from the through hole 24 on the second stator end surface 10 b side and is expanded by inserting a known jig. That is, a flange-shaped deformed portion 33a is formed on the through-hole 24 on the second stator end face 10b side. The flange-shaped deformed portion 33a is formed to overlap the second stator end surface 10b when viewed along the axial direction A. Thereby, the ring-shaped stator iron core 10 is sandwiched between the flange-shaped deformed portion 33a and the axial support surface 21b, and is fixed to the case member 20 in the axial direction A. Note that the annular stator core 10 is sandwiched between the flange-shaped deformed portion 33a and the axial support surface 21b, so that the displacement of the annular stator core 10 in the circumferential direction C is also restricted.

  In such a resolver stator structure, the ring-shaped stator iron core 10 is sandwiched between the flange-shaped deformed portion 33a of the rivet 30 and the axial support surface 21b of the projecting support body 21 provided on the case member 20. The annular stator iron core 10 can be fixed to the case member 20 without requiring thermal expansion or mechanical deformation of 20. Thereby, the influence by the difference in a linear expansion coefficient can be made small, and the annular stator iron core 10 can be fixed to the case member 20 more firmly. Moreover, since it is the structure which clamps the ring-shaped stator iron core 10 along the axial direction A, generation | occurrence | production of shakiness by the elasticity by core lamination | stacking can be suppressed.

  In the embodiment, the protruding support 21 is described as being annular, but a plurality of protruding supports may be arranged at intervals in the circumferential direction.

DESCRIPTION OF SYMBOLS 10 Ring-shaped stator iron core 10a 1st stator end surface 10b 2nd stator end surface 11 Magnetic pole 20 Case member 20a Inner peripheral surface 21 Projection support body 21b Axial support surface 24 Through-hole 30 Rivet 33 Cylindrical tip part 33a Flange-shaped deformation part

Claims (1)

A ring-shaped stator core (10) having a plurality of magnetic poles (11) projecting inward in the radial direction (D) at intervals in the circumferential direction (C);
First and second stator end faces (10a, 10b) provided at both ends of the annular stator core (10) along the axial direction (A);
A case member (20) disposed radially outward (D) of the annular stator core (10);
A protruding support (21) protruding inward in the radial direction (D) from the inner peripheral surface (20a) of the case member (20);
An axial support surface (21b) provided on the protruding support (21) and in contact with the first stator end surface (10a) along the axial direction (A);
A through hole (24) provided in the protruding support (21);
A rivet (30) inserted through the through hole (24) from the first stator end surface (10a) side toward the second stator end surface (10b) side,
The cylindrical tip (33) of the rivet (30) is expanded to form a flange-like deformed portion (33a) on the second stator end face (10b) side, and the flange-like deformed portion (33a) is formed. And the axial support surface (21b) sandwich the annular stator core (10).

Images