JP2014124012A - Resolver stator structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent external magnetic flux from intruding into an annular stator body provided at a shield body.SOLUTION: In a resolver stator structure of the invention, a space (41) is formed between an annular stator body (23) and a shield body (24) through a space formation part (40) formed by protrusions (40A or 40B). The structure allows the shield body (24) and the space (41) to prevent intrusion of magnetic flux from the exterior.

Description

  The present invention relates to a resolver stator structure, and more particularly to a novel structure for forming a gap between an outer peripheral surface of a ring-shaped stator body and an inner peripheral surface of a shield body to prevent magnetic flux from entering the ring-shaped stator body from the outside. Regarding improvement.

As this type of resolver stator structure that has been conventionally used, for example, the configuration disclosed in Patent Document 1 is shown in FIGS. 5 and 6, and the configuration disclosed in Patent Document 2 is shown in FIGS. 7 and 8. be able to.
That is, in the case of the motor with resolver shown in FIGS. 5 and 6, a motor stator 2 having a motor winding 6 is provided in the concave case 4 of the motor 1. A rotor 3 provided on a motor shaft 13 that is rotatable via bearings 14 a and 14 b is provided inside, and a resolver rotor 22 for a resolver 21 is provided near the motor shaft 13.

A first shield member 31 having a cup shape as a whole is provided on the lower surface 8a of the lid 8 that closes the opening 4a of the case 4 and has the bearing 14b. A second shield member 24 having a shape substantially the same as that of the first shield member 31 and having a small size is attached to the lower surface 8a.
A resolver stator 23 is provided on the inner surface of the second shield member 24 so as to correspond to the resolver rotor 22.

A gap 36 is formed between the first and second shield members 31 and 24, and a corner portion 31 a of the first shield member 31 is located in the vicinity of the motor winding 6.
Accordingly, the leakage magnetic flux 6a from the motor winding 6 is shielded by the shield members 31 and 24 and the gap 36, and the leakage magnetic flux is prevented from entering the resolver stator 23 side.

Moreover, in the structure of patent document 2 shown in FIG.7 and FIG.8, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as above-mentioned FIG.5 and FIG.6.
7 and 8, the outer peripheral surface 23a of the ring-shaped stator body 23 is fitted into the inner peripheral surface 24a of the shield body 24 whose overall shape forms a cup shape.
A plurality of projecting magnetic poles 30 projecting inward at predetermined angular intervals are formed on the inner peripheral wall 23 b of the annular stator body 23, and a stator winding 31 is wound around each projecting magnetic pole 30.
Inside each projecting magnetic pole 30 of the ring-shaped stator body 23, the rotor 22 is formed in an eccentric or non-circular shape and is rotatably arranged.

JP 2010-115022 A USP-6,838,804B2 specification

Since the conventional resolver stator structure is configured as described above, the following problems exist.
That is, in the case of the first conventional example shown in FIGS. 5 and 6, since it is necessary to provide the double shield members 24 and 31 with the gap 36 outside the annular stator body 23, the shape of the entire resolver is large. As a result, the shape of the motor was increased in size, and it was impossible to meet the demand for downsizing.

  In the case of the second conventional example shown in FIGS. 7 and 8, the outer peripheral surface 23a of the ring-shaped stator body 23 is in direct contact with the inner peripheral surface 24a of the shield body 24. Therefore, the leakage magnetic flux from an external motor or the like Penetrates the shield body 24 and enters the ring-shaped stator body 23, so that the shield flux 24 has little effect of preventing the leakage magnetic flux from entering.

  The present invention has been made to solve the above-described problems. In particular, a gap is formed between the outer peripheral surface of the annular stator body and the inner peripheral surface of the shield body via a gap forming portion. Thus, the intrusion of magnetic flux from the outside is prevented.

  A resolver stator structure according to the present invention includes a ring-shaped stator body having a plurality of projecting magnetic poles projecting inward at predetermined angular intervals, a stator winding wound around each projecting magnetic pole, and an outer peripheral surface of the ring-shaped stator body. The annular stator body comprising a shield body located outside and having a cup shape as a whole, an inner circumferential surface of the shield body, and a gap forming portion provided between the outer circumferential surface of the annular stator body A gap is formed between the outer peripheral surface of the shield member and the inner peripheral surface of the cylindrical portion of the shield body via the gap forming portion, and the clearance prevents the magnetic flux from entering the annular stator body from the outside. The gap forming portion is configured by a plurality of first protrusions formed on the outer peripheral surface of the annular stator body, and the gap forming portion is a cylinder of the shield body. Inner circumference A plurality of second consisting projection arrangement formed.

Since the resolver stator structure according to the present invention is configured as described above, the following effects can be obtained.
That is, an annular stator body having a plurality of projecting magnetic poles projecting inward at predetermined angular intervals, a stator winding wound around each of the projecting magnetic poles, and an overall shape located outside the outer peripheral surface of the annular stator body Comprising a shield body having a cup shape, an inner peripheral surface of the shield body, and a gap forming portion provided between the outer peripheral surface of the annular stator body, and the outer peripheral surface of the annular stator body and the shield A gap is formed between the inner peripheral surface of the cylindrical portion of the body via the gap forming portion, and the gap prevents the magnetic flux from entering the annular stator body from the outside. The shield body can be firmly fixed to the annular stator body while reducing the influence from the external magnetic flux.
Moreover, the said clearance gap formation part can form a clearance gap easily and reliably by consisting of several 1st protrusion formed in the outer peripheral surface of the said annular stator body.
Moreover, the said clearance gap formation part can form a clearance gap easily and reliably by consisting of several 2nd protrusion formed in the internal peripheral surface of the cylindrical part of the said shield body.

It is a top view which shows the resolver stator structure by this invention. It is a longitudinal cross-sectional view of FIG. It is a top view which shows the other form of FIG. It is a longitudinal cross-sectional view of FIG. It is sectional drawing which shows the conventional resolver structure with a motor. It is an enlarged view which shows the principal part of FIG. It is a top view which shows the conventional resolver stator structure. It is a longitudinal cross-sectional view of FIG.

  It is an object of the present invention to provide a resolver stator structure in which a gap is formed between an outer peripheral surface of a ring-shaped stator body and an inner peripheral surface of a shield body to prevent magnetic flux from entering the ring-shaped stator body from the outside. Objective.

Hereinafter, preferred embodiments of a resolver stator structure according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is used for the same or equivalent part as a prior art example, and is demonstrated.
1 and 2, what is denoted by reference numeral 23 is a ring-shaped stator body, and a plurality of projecting magnetic poles 30 projecting inward at predetermined angular intervals are provided on the inner peripheral wall 23a of the ring-shaped stator body 23. Each of the projecting magnetic poles 30 is wound with a stator winding 31 composed of a known excitation winding and output winding.

On the outer peripheral surface 23a of the annular stator body 23, a gap forming portion 40 is formed which is formed of a first protrusion 40A formed integrally with the outer peripheral surface 23a, and on the outer side of the annular stator body 23, the gap forming portion 40 is formed. The shield body 24 is press-fitted so as to be in contact with the outer surface 40a.
The shield body 24 is formed of a material that hardly allows magnetic flux from the outside to pass therethrough, and is formed so that the overall shape is substantially cup-shaped.
The inner peripheral surface 24a of the cylindrical portion 24A of the shield body 24 is in contact with the outer surface 40a of the gap forming portion 40, and the outer peripheral surface 23a of the annular stator body 23 and the inner peripheral surface of the cylindrical portion 24A of the shield body 24. A plurality of gaps 41 having an arc shape when viewed in a plane are formed between 24a and 24a.

A rotor 22 having no winding is rotatably disposed inside each protruding magnetic pole 30, and the rotor 22 is formed eccentrically or non-circularly. The rotor 22 constitutes a known variable reluctance type resolver.
Therefore, in the resolver stator structure in the configuration shown in FIGS. 1 and 2, the external magnetic flux leaking from the winding of the motor (not shown) is applied to the annular stator body 23 by the magnetic shielding action by the shield body 24 and the gap 41. Intrusion of external magnetic flux is effectively prevented.

In the resolver stator structure shown in FIGS. 1 and 2, the case where the gap forming portion 40 is formed integrally with the outer peripheral surface 23a of the annular stator body 23 has been described. Similar effects can be obtained when the gap forming portion 40 is formed on the inner peripheral surface 24a of the shield body 24 as in the embodiment.
That is, as shown in FIGS. 3 and 4, a plurality of gap forming portions 40 are integrally formed at a predetermined angular interval on the inner peripheral surface 24 a of the shield body 24, and an inner surface 40 b of each gap forming portion 40 is formed. By contacting the outer peripheral surface 23a of the ring-shaped stator body 23, a plurality of gaps 41 are formed in a plan view.
Since other configurations are the same as those in FIGS. 1 and 2 described above, the same parts are denoted by the same reference numerals, and description thereof is omitted.

  In the resolver stator structure according to the present invention, a gap is formed between the ring-shaped stator body and the shield body via a gap forming portion, thereby preventing the external magnetic flux from entering the inside and improving the detection accuracy. be able to.

22 rotor 23 ring-shaped stator body 23a outer peripheral surface 24 shield body 24a inner peripheral surface 24A cylindrical portion 30 protruding magnetic pole 31 stator winding 40 gap forming portion 40A first protrusion 40B second protrusion 40a outer surface 40b inner surface 41 gap

Claims (3)

An annular stator body (23) having a plurality of projecting magnetic poles (30) projecting inward at predetermined angular intervals, a stator winding (31) wound around each projecting magnetic pole (30), and the annular stator body A shield body (24) located outside the outer peripheral surface (23a) of the (23) and having a cup shape as a whole, an inner peripheral surface (24a) of the shield body (24), and the annular stator body (23) A gap forming portion (40) provided between the outer peripheral surface (23a) of
Between the outer peripheral surface (23a) of the annular stator body (23) and the inner peripheral surface (24a) of the cylindrical portion (24A) of the shield body (24), the gap forming portion (40) is interposed. A resolver stator structure characterized in that a gap (41) is formed and the gap (41) prevents entry of magnetic flux from the outside into the annular stator body (23).   The resolver stator structure according to claim 1, wherein the gap forming portion (40) includes a plurality of first protrusions (40A) formed on an outer peripheral surface (23a) of the annular stator body (23).   The said gap formation part (40) consists of several 2nd protrusion (40B) formed in the internal peripheral surface (24a) of the cylindrical part (24A) of the said shield body (24), 2. A resolver stator structure according to 1.

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