Resolver stator structure

Abstract

To provide a resolver stator structure which enables improvement of effect of a shield member with a simple structure.SOLUTION: A resolver stator structure 10 includes: a ring shaped shield cover 30 which is provided at the outer side of the ring shaped stator core 20 and reduces influence of magnetic noise on the ring shaped stator core 20 or a stator coil 23; and a face plate 40 which is formed by a non-magnetic metal material, such as aluminum alloy, and integrated with the ring shaped stator core 20 by insert-molding and separates the ring shaped stator core 20 from the ring shaped shield cover 30.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a resolver stator structure, and more particularly to a resolver stator structure having a shield member that blocks or reduces magnetic noise to a stator core or a stator winding. [Background technology]

[0002] Known conventional resolver stator structures include, for example, a resolver stator structure as described in Patent Document 1. As shown in Fig. 6, in the resolver stator structure 100 described in Patent Document 1, an annular shield cover 30 is provided on the outside of an annular stator core 20 to block or reduce magnetic noise flowing from a motor (not shown) into the annular stator core 20 or the stator windings. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-157180 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional resolver stator structure 100 shown in FIG. 6, the annular shield cover 30 is in contact with the annular stator core 20, and therefore magnetic noise received by the annular shield cover 30 is likely to flow into the annular stator core 20, resulting in a problem in that the effectiveness of the annular shield cover 30 is reduced.

[0005] The present invention has been made to solve such problems, and has an object to provide a resolver stator structure that can improve the effect of the shield member with a simple configuration. [Means for solving the problem]

[0006] In order to solve the above problems, the resolver stator structure of the present invention includes an annular stator core having a plurality of protruding magnetic poles protruding inward at predetermined angular intervals, and a stator winding wound around each of the protruding magnetic poles via annular insulating covers provided on both end surfaces of the annular stator core, the resolver stator structure further includes an annular shield member provided on the outside of the annular stator core for reducing the effect of magnetic noise on the annular stator core or the stator winding, and a spacer formed of a non-magnetic material, integrated with the annular stator core by insert molding, and separating the annular stator core from the annular shield member. The spacer is made of a plate-shaped non-magnetic metal material, and one surface of the spacer is in contact with the annular stator core and the other surface of the spacer is in contact with the annular shield member. do.

[0007] The spacer may also have a notch or hole into which a fastening member is inserted for fastening the annular stator core and the annular shield member. The spacer may also be made of a non-magnetic metal material. Effect of the Invention

[0008] The resolver stator structure of the present invention is formed from a non-magnetic material, is integrated with the annular stator core by insert molding, and has a spacer that separates the annular stator core and the annular shield member, thereby improving the effectiveness of the shield member. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of a resolver stator structure according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram of a stator core and an annular shield cover according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic diagram of the annular stator core shown in FIG. 2. [Figure 4] FIG. 4 is an enlarged view of the annular stator core shown in FIG. [Diagram 5] 2 is a cross-sectional view taken along line AA of the resolver stator structure shown in FIG. 1. [Figure 6] FIG. 1 is an enlarged cross-sectional view of a conventional resolver stator structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings of Figures 1 to 5. Note that the same or equivalent parts as those in the conventional example shown in Figure 6 are denoted by the same reference numerals. Fig. 1 is a schematic diagram of a resolver stator structure according to this embodiment. The resolver stator structure 10 has an annular stator core 20 and an annular shield cover 30 attached to the outside of the annular stator core 20. Since the annular stator core 20 is covered by the annular shield cover 30, the detailed configuration of the annular stator core 20 is not shown in Fig. 1. The annular shield cover 30 is fastened to the annular stator core 20 by bolts 31 at three points in the circumferential direction. The annular shield cover 30 constitutes an annular shield member, and the bolts 31 constitute fastening members.

[0011] The ring-shaped shield cover 30 is either a ring-shaped shield cover formed of any ferromagnetic metal material, such as permalloy or stainless steel, or a ring-shaped shield cover made of a material other than ferromagnetic metal, such as plastic, to which a magnetic shield function has been imparted by applying magnetic shield plating or by attaching a magnetic shield material tape, and has the function of a magnetic shield that blocks or reduces external magnetic noise.

[0012] FIG. 2 is a schematic diagram of the annular stator core 20 and the annular shield cover 30 according to the present embodiment. The annular stator core 20 has a plurality of teeth 22 that protrude radially inward at a predetermined angular interval. An annular insulating cover 21 made of an insulating material is provided on both end faces of the annular stator core 20. Furthermore, a terminal holding portion 50 for holding each terminal connected to the stator winding wound around each tooth 22 is provided on the outer periphery of the annular stator core 20. The annular insulating cover 21 and the terminal holding portion 50 are formed integrally with the annular stator core 20 by insert forming. The teeth 22 constitute protruding magnetic poles. The annular shield cover 30 has a total of three notches 32 for passing the bolts 31 at angular intervals in the circumferential direction.

[0013] Fig. 3 is a schematic diagram of the annular stator core 20 shown in Fig. 2 as viewed from the axial direction. Stator windings 23 are wound around each of the teeth 22. Furthermore, a total of three face plates 40 made of a non-magnetic metal material such as an aluminum alloy are provided on the outer periphery of the annular stator core 20 at angular intervals in the circumferential direction.

[0014] FIG. 4 is an enlarged view of a face plate 40 of the annular stator core 20 shown in FIG. 3. Note that the stator windings 23 are omitted in FIG. 4. Each face plate 40 is formed integrally with the annular stator core 20 by insert molding. Each face plate 40 has a notch 41 that opens radially outward. Furthermore, the annular stator core 20 has a total of three notches 24 that open radially outward at positions corresponding to the notches 41 of each face plate 40. The size of each notch 24 is smaller than that of each notch 41. Each notch 24 and each notch 41 are provided at a position corresponding to the notch 32 of the annular shield cover 30 shown in FIG. 2. The annular shield cover 30 and the annular stator core 20 are fastened to each other by inserting a bolt 31 (see FIG. 1) into each notch 32, each notch 24, and each notch 41.

[0015] Fig. 5 is a cross-sectional view of the resolver stator structure 10 shown in Fig. 1 taken along line AA. Note that the bolts 31 and the stator windings 23 (see Fig. 3) are omitted in Fig. 5. One surface of the face plate 40 contacts the annular stator core 20, and the other surface of the face plate 40 contacts both the annular shield cover 30 and the annular stator core 20, forming a spacer that separates the annular stator core 20 and the annular shield cover 30.

[0016] In the resolver stator structure 10 of this embodiment, the annular stator core 20 and the annular shield cover 30 are spaced apart by a face plate 40 made of a nonmagnetic metal material such as an aluminum alloy. As a result, for example, when a resolver provided with this resolver stator structure 10 is used as an angle detector for a motor (not shown), when magnetic noise from a motor provided near the resolver is received by the annular shield cover 30, the magnetic noise is less likely to flow from the annular shield cover 30 into the annular stator core 20. Therefore, it is possible to block or reduce magnetic noise flowing from the outside of the resolver stator structure 10 into the annular stator core 20 or the stator winding 23 of the annular stator core 20.

[0017] 3, each face plate 40 is integrally formed with the annular stator core 20 by insert molding, which eliminates the need to attach each face plate 40 individually to the annular stator core 20 during manufacturing of the resolver stator structure 10, making it possible to reduce the number of steps in manufacturing the resolver stator structure 10. Furthermore, each face plate 40 is integrally formed with the annular stator core 20 by insert molding, which significantly reduces the possibility of the face plates 40 falling off or being misaligned during manufacturing of the resolver stator structure 10, making it possible to reduce the number of manufacturing steps and manufacture the resolver stator structure 10 with high accuracy.

[0018] In addition, since the face plate 40 is made of a non-magnetic metal material such as an aluminum alloy, deformation such as shrinkage is unlikely to occur. Therefore, there is an advantage that after the annular shield cover 30 is fastened to the annular stator core 20 by the bolts 31 as shown in Fig. 1, there is a low possibility that the bolts 31 will become loose due to deformation of the face plate 40. Furthermore, there is an advantage that the annular shield cover 30 is supported by the face plate 40 made of a non-magnetic metal material, which improves the workability when installing the annular shield cover 30.

[0019] In addition, since the cutout portion 24 of the annular stator core 20, the cutout portion 41 of the face plate 40, and the cutout portion 32 of the annular shield cover 30 are formed in corresponding positions, the annular shield cover 30 and the annular stator core 20 can be easily fastened together by the bolt 31.

[0020] In this manner, the resolver stator structure according to the present embodiment includes an annular stator core 20 having a plurality of teeth 22 protruding inward at a predetermined angular interval, and a stator winding 23 wound around each tooth 22 via annular insulating covers 21 provided on both end faces of the annular stator core 20. The resolver stator structure further includes an annular shield cover 30 provided on the outside of the annular stator core 20 to reduce the effect of magnetic noise on the annular stator core 20 or the stator winding 23, and a face plate 40 made of a non-magnetic metal material such as an aluminum alloy, integrated with the annular stator core 20 by insert molding, and separating the annular stator core 20 and the annular shield cover 30. This makes it possible to improve the effect of the annular shield cover 30 with a simple configuration.

[0021] In addition, the face plate 40 has a cutout portion 41 into which a bolt 31 for fastening the annular stator core 20 and the annular shield cover 30 is inserted, so that the annular shield cover 30 and the annular stator core 20 can be easily fastened together.

[0022] Furthermore, since the face plate 40 is made of a non-magnetic metal material, the possibility that the bolt 31 will become loose due to deformation of the face plate 40 is reduced.

[0023] In this embodiment, three notches 24 are provided in the annular stator core 20, three notches 41 are provided in the face plate 40, and three notches 32 are provided in the annular shield cover 30, but the numbers of these notches 24, 32, and 41 are merely examples, and it is sufficient that an appropriate number corresponding to the number of bolts 31 required is provided.

[0024] In addition, in this embodiment, three notches 24 are provided in the annular stator core 20, three notches 41 are provided in the face plate 40, and three notches 32 are provided in the annular shield cover 30, but bolt holes may be provided instead of these notches 24, 32, and 41, thereby achieving the same effect as in this embodiment.

[0025] In addition, in the present embodiment, the face plate 40 is made of a non-magnetic metal material such as an aluminum alloy, but it may be made of a resin material as long as the required strength can be ensured, thereby reducing the weight of the resolver stator structure 10 and the manufacturing cost. [Industrial Applicability]

[0026] According to the resolver stator structure 10 of the embodiment of the present invention, the face plate 40 formed of a non-magnetic metal material can separate the annular stator core 20 and the annular shield cover 30, and therefore the resolver stator structure 10 can be used in a resolver stator structure 10 having an annular shield cover 30 using a ferromagnetic metal material as the annular shield cover 30. [Explanation of symbols]

[0027] 20 Ring-shaped stator core 21 Ring-shaped insulating cover 22 teeth (protruding magnetic pole) 23 Stator Winding 30 Ring-shaped shield cover (ring-shaped shield member) 31 Bolt (fastening member) 40 Face plate (spacer) 41 Notch

Claims

1. A resolver stator structure including: an annular stator core (20) having a plurality of protruding magnetic poles (22) protruding inward at predetermined angular intervals; and a stator winding (23) wound around each of the protruding magnetic poles (22) via annular insulating covers (21) provided on both end faces of the annular stator core (20), an annular shield member (30) provided on the outside of the annular stator core (20) and configured to reduce the effect of magnetic noise on the annular stator core (20) or the stator winding (23); A spacer (40) made of a non-magnetic material, integrated with the annular stator core (20) by insert molding, and separating the annular stator core (20) from the annular shield member (30). and The spacer (40) is formed from a plate-shaped non-magnetic metal material, and has one surface in contact with the annular stator core (20) and the other surface in contact with the annular shield member (30), forming a resolver stator structure.

2. 2. The resolver stator structure according to claim 1, wherein the spacer (40) has a notch (41) or a hole into which a fastening member (31) for fastening the annular stator core (20) and the annular shield member (30) is inserted.

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