JP2016111731A - Resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resolver by which effects of a stator coil of teeth can be made closer to an ideal stator coil and angle detection accuracy can be improved.SOLUTION: An annular stator 1 comprises an annular stator yoke 2 and a plurality of teeth 3 extending radially inside from an inner edge 20 of the annular stator yoke 2 while interposing an interval therebetween in a circumferential direction. Each of the teeth 3 includes a pillar 30 and a head 31. The pillar 30 is a pillar-shaped portion extending from the inner edge 20. The pillar 30 is formed in such a manner that a width dimension in the circumferential direction changes in a direction of extension of the pillar 30. Specifically, the pillar is formed in such a manner that the width dimension in the circumferential direction of the annular stator yoke 2 becomes narrow continuously from a proximal end 30b to a distal end 30a of the pillar 30. A cross-sectional area and a circumferential length of the pillar 30 depend on the width dimension of the pillar 30 in the circumferential direction of the annular stator yoke 2, such that the cross-sectional area and the circumferential length become large as they get closer to the proximal end 30b, and become small as they get closer to the distal end 30a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resolver including a ring-shaped stator yoke having teeth.

  As this type of resolver used conventionally, for example, a configuration described in Patent Document 1 below can be given. That is, the conventional resolver includes a ring-shaped stator having a ring-shaped stator yoke and a plurality of teeth protruding radially inward from the inner peripheral edge of the ring-shaped stator yoke at intervals in the circumferential direction. The teeth include a column portion extending from the inner peripheral edge of the annular stator yoke. A bobbin around which a stator winding is wound is attached to the column portion. The width dimension of the column portion along the circumferential direction of the ring-shaped stator yoke is constant, and the cross-sectional area and circumferential length of the column portion are constant along the extending direction of the column portion.

JP-A-8-98486

  In the conventional resolver as described above, since the cross-sectional area and the circumferential length of the column portion are constant along the extending direction of the column portion, the effect of one turn of the stator winding is also in the extending direction of the column portion. Is constant along. On the other hand, since the ideal number of turns of the stator winding is calculated as a number including a decimal number, an ideal stator winding cannot be realized with the conventional resolver teeth pillar portion as described above. , Angle detection accuracy is lowered.

  The present invention has been made to solve such a problem. A resolver that can bring the effect of the stator winding close to that of an ideal stator winding and improve the angle detection accuracy is provided. The purpose is to provide.

  A resolver according to the present invention includes a ring-shaped stator having a ring-shaped stator yoke and a plurality of teeth protruding in a radial direction from the ring-shaped stator yoke spaced apart from each other in the circumferential direction. And includes a column part around which the stator winding is wound, and the column part is formed so that the width dimension in the circumferential direction changes along the extending direction.

  According to the resolver of the present invention, the width of the teeth column portion in the circumferential direction of the annular stator yoke is formed so as to change along the extending direction. You can approximate the effect of the line. Thereby, the detection accuracy of the resolver angle can be improved.

It is a top view of the ring-shaped stator of the resolver which concerns on embodiment of this invention. It is a top view of the ring-shaped stator of the resolver which concerns on the modification of embodiment of this invention. It is a top view of the ring-shaped stator of the resolver which concerns on the modification of embodiment of this invention. It is a top view of the ring-shaped stator of the resolver which concerns on the modification of embodiment of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a plan view of a ring-shaped stator of a resolver according to an embodiment of the present invention. In FIG. 1, the ring-shaped stator 1 includes a ring-shaped stator yoke 2 and a plurality of teeth 3 extending radially inward from the inner peripheral edge 20 of the ring-shaped stator yoke 2 at intervals in the circumferential direction.

Each tooth 3 includes a column part 30 and a head part 31. The column part 30 is a columnar part extended from the inner peripheral edge 20. The column part 30 is formed so that the width dimension in the circumferential direction changes along the extending direction of the column part 30. Specifically, it is formed so that the width dimension in the circumferential direction of the annular stator yoke 2 is continuously reduced from the base end 30b of the column portion 30 toward the tip end 30a. Since the cross-sectional area and the circumferential length of the column portion 30 depend on the width dimension of the column portion 30 in the circumferential direction of the ring-shaped stator yoke 2, it is larger as it is closer to the proximal end 30b and smaller as it is closer to the distal end 30a.
The head portion 31 is a portion provided integrally with the tip 30 a of the pillar portion 30 so as to form a T shape together with the pillar portion 30. The head portion 31 includes a central portion 31a that contacts the tip of the column portion 30 and a pair of protruding portions 31b that protrude in the circumferential direction from the central portion 31a.

  A resin bobbin (not shown) is attached to each column part 30. The bobbin has a length substantially equal to the column part 30 in the extending direction of the column part 30. The stator winding is closely wound around the bobbin to form a coil. That is, the stator winding is wound around the column portion 30 via the bobbin.

  The effect of each turn of the stator winding is determined by the cross-sectional area and the circumferential length of the column part 30 at the position where the stator winding is wound. Therefore, in the resolver having such a ring-shaped stator 1, the effect of each turn of the stator winding varies depending on the width dimension of the column portion 30 in the circumferential direction. Therefore, the change in the width dimension along the extending direction from the base end 30b to the tip end 30a of the column portion 30 in the circumferential direction of the annular stator yoke 2 is adjusted at the time of designing the column portion 30, and the effect of the stator winding is ideal. The column portion 30 is formed so as to approximate the effect of a typical stator winding. Thereby, the effect of the stator winding can be brought close to the effect of the ideal stator winding, and the detection accuracy of the resolver angle can be improved.

  Further, as described above, the effect of each turn of the stator winding is determined by the cross-sectional area and the circumferential length of the column portion 30 at the position where the stator winding is wound. Therefore, in the resolver having such a ring-shaped stator 1, the sectional area and the circumferential length of the column portion 30 at the position where the stator winding is wound are adjusted by adjusting the winding position of the stator winding around the bobbin. be able to. Therefore, by adjusting the winding position of the stator winding around the bobbin, the position of the stator winding is changed from the base end 30b to the tip end 30a of the column portion 30, and the effect of the stator winding can be achieved with an ideal stator. It can approach the effect of winding. Thereby, the detection accuracy of the angle of the resolver can be improved similarly.

  In the embodiment, the column portion 30 is formed so that the width dimension along the circumferential direction of the annular stator yoke 2 continuously decreases from the base end 30b to the tip end 30a. As described above, the column portion 130 may be formed so that the width dimension continuously increases from the base end 130b toward the tip 130a. Thereby, the same effect as the embodiment can be obtained.

  Further, as shown in FIG. 3, the column portion 230 may be formed so that the width dimension along the circumferential direction of the annular stator yoke 2 gradually increases from the base end 230b to the tip end 230a. By forming in this way, the change of the shape of the column part 230 becomes clearer than the case where the shape of the column part changes continuously. Therefore, it is easy to designate the winding position of the stator winding when the stator winding is wound by the automatic winding machine. Thereby, even when the winding work is automated, the effect of the stator winding can be brought close to the effect of the ideal stator winding, and the detection accuracy of the resolver angle can be improved. Further, in this case, the column part 230 may be formed so that the width dimension along the circumferential direction of the annular stator yoke 2 is gradually reduced from the base end 230b toward the front end 230a.

  Further, as shown in FIG. 4, at the intermediate position 333c between the base end 330b and the tip end 330a of the column part 330, the width dimension of the column part 330 along the circumferential direction of the annular stator yoke 2 at the intermediate position 333c is the narrowest. You may form as follows. Thereby, the change of the shape of the pillar part 330 becomes clearer, and it becomes easier to specify the winding position of the stator winding. Therefore, when winding the stator winding with an automatic winding machine, the effect of the stator winding can be brought close to the effect of the ideal stator winding even when the winding work is automated, and the detection accuracy of the resolver angle Can be improved.

  1 ring-shaped stator, 2 ring-shaped stator yoke, 3 teeth, 20 inner peripheral edge, 30, 130, 230, 330 pillar portion, 30b, 130b, 230b, 330b proximal end, 30a, 130a, 230b, 230c distal end, 330c intermediate position.

Claims (6)

An annular stator having an annular stator yoke and a plurality of teeth protruding radially from the annular stator yoke at intervals in the circumferential direction;
The teeth include a column portion that extends from an inner peripheral edge of the annular stator yoke and around which a stator winding is wound,
The columnar part is formed so that a width dimension in the circumferential direction changes along an extending direction. 2. The resolver according to claim 1, wherein a width dimension of the column portion in the circumferential direction is continuously narrowed from a base end of the column portion toward a tip end of the column portion. The resolver according to claim 1, wherein a width dimension of the column portion in the circumferential direction is continuously widened from a base end of the column portion toward a tip end of the column portion. The resolver according to claim 1, wherein a width dimension of the column portion in the circumferential direction is gradually reduced from a base end of the column portion toward a tip end of the column portion. The resolver according to claim 1, wherein a width dimension of the column portion in the circumferential direction is gradually increased from a base end of the column portion toward a tip end of the column portion. 2. The resolver according to claim 1, wherein a width dimension of the column part in the circumferential direction is narrowest at an intermediate position between a base end of the column part and a top of the column part.

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