JP2013165608A - Resolver stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resolver stator capable of blocking a stator winding from magnetic field noise and electric field noise without increase of components and enlargement of mounting space.SOLUTION: One end of each of bobbins 2 aligned in circumferential direction of a bobbin support frame 12 is covered by an end shield 41 formed of a metal, and a row of bobbins 2 aligned in circumferential direction of the bobbin support frame 12 is surrounded by a side shield 42 formed of a metal. Consequently, a stator winding of each bobbin 2 is blocked from magnetic field noise and electric field noise. A mounting pin 3 formed on the bobbin 2 is inserted into a pin hole of the end shield 41 and is heatedly deformed so that the shape of the tip part of the mounting pin 3 is larger than an inner diameter of the pin hole so as to fix a shield body 4 to a stator body 1.

Description

  The present invention relates to a resolver stator applied to a rotating electrical machine.

As a means for detecting a rotation angle of a motor generator which is a rotating electric machine mounted on a hybrid vehicle, there is one to which a resolver is applied.
The resolver includes a resolver rotor and a resolver stator as constituent elements.
The resolver rotor rotates together with a member whose rotation angle is to be detected. When this resolver rotor is viewed in the axial direction, for example, it has a shape that is not a perfect circle such as an ellipse.
The resolver stator has a shape surrounding the resolver rotor in the circumferential direction.
Conventionally, as this type of resolver stator, one having a ring-shaped stator body, a first ring-shaped winding cover, and a second ring-shaped winding cover is known (for example, see Patent Document 1).

The axial center of the ring-shaped stator body in the resolver stator coincides with the rotation center of the resolver rotor.
The annular stator body has a plurality of magnetic poles. The magnetic poles are provided at equal intervals in the circumferential direction on the inner peripheral portion of the annular stator body. Each magnetic pole protrudes from the inner peripheral portion of the annular stator body toward the center of the annular stator body. Each of the magnetic poles is wound with a stator winding composed of an excitation winding and an output winding.
The ring-shaped stator body has a plurality of through holes. The through hole penetrates in the member thickness direction of the annular stator body. The through hole is located on the radially outer side of the annular stator body with respect to the stator winding.

The first annular winding cover has a shape that can cover each stator winding from one side of the annular stator body. A plurality of first protrusions that can enter the respective through holes of the annular stator body are provided on the peripheral portion of the first annular winding cover. The first protrusion penetrates the through hole of the annular stator body and protrudes to the other side of the annular stator body.
The second annular winding cover has a shape that can cover each stator winding from the other side of the annular stator body. A plurality of second protrusions that come into contact with the tip end portions of the first protrusions in the first annular winding cover are provided on the peripheral portion of the second annular winding cover.
The first annular winding cover and the second annular winding cover are made of a resin material.
The first protrusion in the first annular winding cover and the second protrusion in the second annular winding cover are welded by heating. Thus, the first annular winding cover and the second annular winding cover are fixed to the annular stator body.

In the resolver including the resolver stator as described above, when an AC voltage is applied to the excitation winding in the stator winding of each magnetic pole, an AC voltage is generated in the output winding in the stator winding of each magnetic pole by electromagnetic induction. Become.
When the resolver rotor rotates with the member whose rotation angle is to be detected, the shape of the resolver rotor viewed in the axial direction is not a perfect circle, so the gap between the tip of each magnetic pole and the outer peripheral surface of the resolver rotor Change.
Thereby, the reluctance between each magnetic pole and the resolver rotor, that is, the magnetic resistance fluctuates following the change of the gap, and the AC voltage generated in the output winding in the stator winding of each magnetic pole is periodically changed. Will fluctuate.
Using the AC voltage generated at the output winding in the stator winding of each magnetic pole as a signal, the rotation angle of the resolver rotor, that is, the rotation angle of the member to be detected is detected by continuously measuring the change in voltage of this signal. it can.

JP 2003-209946 A

However, in a hybrid vehicle, magnetic field noise, specifically electromagnetic induction noise, is generated around the motor generator due to a change in the current supplied to the motor generator or a change in the current generated by the motor generator. To occur.
Further, in a hybrid vehicle, electric field noise, specifically, electrostatic noise is generated around the motor generator due to a change in the voltage of the electric power supplied to the motor generator or a change in the voltage of the electric power generated by the motor generator. To occur.
For this reason, when a resolver is used as a means for detecting the rotation angle of a motor generator mounted on a hybrid vehicle, the magnetic field noise and electric field noise described above affect the output winding in the stator winding of each magnetic pole. Thus, there is a concern that the signal that is the AC voltage output from the output winding is disturbed, and the rotation angle of the member to be detected cannot be accurately detected.
In addition, it is conceivable that the resolver is housed in a metal-made container and shielded from magnetic field noise and electric field noise, but the number of components increases and the mounting space increases.

  The present invention has been made to solve the above-described conventional problems, and provides a resolver stator that can shield the stator winding from magnetic field noise and electric field noise, does not increase the number of components, and does not increase the mounting space. The task is to do.

  In order to solve the above problems, a resolver stator according to the present invention is provided at (1) a stator body having an annular bobbin support frame, a plurality of bobbins having a magnetic member and a stator winding, and one end of the bobbin. A resolver stator in which a resolver rotor is disposed in a space surrounded by the plurality of bobbins, wherein the bobbin is formed of a thermoplastic resin and has an inner periphery of the bobbin support frame. The mounting pin is formed integrally with the bobbin by a thermoplastic resin, and protrudes from one end of the bobbin in parallel with the central axis of the bobbin support frame. The shield body protrudes from the outer peripheral edge of the end shield toward the bobbin support frame, covering the one end of each bobbin. And an annular side shield extending in the circumferential direction of the end shield, wherein the end shield and the side shield are formed of metal, and the attachment pin is inserted through the end shield. Having a pin hole, and inserting the mounting pin into the pin hole, and thermally deforming the tip of the mounting pin so that the shape of the tip of the mounting pin is larger than the inner diameter of the pin hole. Features.

With this configuration, in the resolver stator according to the present invention, one end of each bobbin arranged in the circumferential direction of the bobbin support frame is covered with an end shield formed of metal and arranged in the circumferential direction of the bobbin support frame. The bobbin rows are surrounded by metal side shields to shield the stator windings of each bobbin from magnetic and electric field noise.
Therefore, the signal output from the stator winding of each bobbin is not disturbed, and the rotation angle of the member to be detected can be accurately detected.
The mounting pin formed on the bobbin is inserted into the pin hole of the end shield, the mounting pin is thermally deformed so that the shape of the tip of the mounting pin is larger than the inner diameter of the pin hole, and the shield body is fixed to the stator. Secure to the body. The end shield plays a role of protecting the stator winding of each bobbin.
Therefore, the number of parts does not increase and the mounting space does not increase.

  According to the present invention, it is possible to provide a resolver stator that can shield the stator winding from magnetic field noise and electric field noise, does not increase the number of components, and does not increase the mounting space.

In the resolver stator which concerns on embodiment of this invention, it is a perspective view which shows the state after attaching a shield main body to a stator main body. In the resolver stator which concerns on embodiment of this invention, it is a perspective view which shows the state before attaching a shield main body to a stator main body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
As shown in FIGS. 1 and 2, the resolver stator 10 according to the embodiment of the present invention includes a stator body 1, a bobbin 2, a mounting pin 3, and a shield body 4.

The stator main body 1 includes an annular reinforcing plate 11 and an annular bobbin support frame 12 extending along the inner peripheral edge of the reinforcing plate 11. The reinforcing plate 11 is made of metal. The bobbin support frame 12 is formed of a thermoplastic resin. The bobbin support frame 12 sandwiches the inner peripheral edge of the reinforcing plate 11 in the member thickness direction, and the bobbin support frame 12 and the reinforcing plate 11 are fixed to each other.
Bolt mounting portions 13 are provided at three locations on the outer peripheral portion of the bobbin support frame 12. Each bolt mounting portion 13 is integrally formed with the bobbin support frame 12 by a thermoplastic resin. The bolt mounting portion 13 sandwiches the outer peripheral edge portion of the reinforcing plate 11 in the member thickness direction, and the bolt mounting portion 13 and the reinforcing plate 11 are fixed to each other via the bobbin support frame 12. ing.
Each bolt mounting portion 13 has a bolt hole 13 a penetrating in parallel with the central axis of the bobbin support frame 12. Bolts for fastening the stator main body 1 to the case are inserted into the bolt holes 13a.

The bobbin 2 has a flange 21 facing in parallel and a core connecting both the flanges 21. The core is not shown because a stator winding 23, which will be described later, overlaps. The flange 21 and the core are integrally formed of a thermoplastic resin. A magnetic member 22 is embedded in the bobbin 2 so as to penetrate the flange 21 and the core. A stator winding 23 is wound around a core positioned between the pair of flanges 21. The stator winding 23 includes an excitation winding and an output winding.
The bobbins 2 are provided on the inner peripheral portion of the bobbin support frame 12 so that eight bobbins 2 are arranged in the circumferential direction. The thermoplastic resin forming each bobbin 2 is the same as the thermoplastic resin forming the bobbin support frame 12 in the stator body 1, and each bobbin 2 is integrated with the bobbin support frame 12. ing.

In the resolver stator 10, a resolver rotor is disposed in a space surrounded by the eight bobbins 2, similarly to a conventional resolver. The rotational center of the resolver rotor coincides with the central axis of the space surrounded by the plurality of bobbins 2.
The resolver rotor is configured to rotate integrally with a member whose rotation angle is to be detected. When the resolver rotor is viewed in the axial direction, for example, it has a shape that is not a perfect circle such as an ellipse.
When the resolver rotor rotates together with the member whose rotation angle is to be detected, the shape of the resolver rotor viewed in the axial direction is not a perfect circle, so the tip of the magnetic body member 22 of each bobbin 2 and the outer peripheral surface of the resolver rotor The gap between and changes periodically.

Two mounting pins 3 are provided for every other one of the eight bobbins 2 arranged in the circumferential direction of the bobbin support frame 12. That is, the bobbin 2 provided with the mounting pin 3 and the bobbin 2 without the mounting pin 3 are alternately arranged in the circumferential direction of the bobbin support frame 12.
The mounting pin 3 projects from one end of each bobbin 2 in parallel with the central axis of the bobbin support frame 12. The mounting pin 3 is made of a thermoplastic resin. The thermoplastic resin forming each mounting pin 3 is the same as the thermoplastic resin forming the bobbin 2, and each mounting pin 3 is integrated with the corresponding bobbin 2.

The shield body 4 protrudes toward the bobbin support frame 12 from the outer peripheral edge of the end shield 41 and an annular end shield 41 that covers one end of each bobbin 2 arranged in the circumferential direction of the bobbin support frame 12. , And an annular side shield 42 extending in the circumferential direction of the end shield 41. The end shield 41 and the side shield 42 are made of metal.
The end shield 41 has a pin hole 41a through which the attachment pin 3 is inserted. The mounting pin 3 is inserted through the pin hole 41a.
As a result, one end of each bobbin 2 aligned in the circumferential direction of the bobbin support frame 12 is covered with the end shield 41, and the row of bobbins 2 aligned in the circumferential direction of the bobbin support frame 12 It will be in the state surrounded by the part shield 42. FIG.
The end shield 41 that covers one end of each bobbin 2 also serves to protect the stator winding 23 of each bobbin 2.
Then, the tip end portion of each mounting pin 3 is plastically deformed by heating so that the shape of the tip end portion of the mounting pin 3 is larger than the inner diameter of the pin hole 41a, so that the shield body 4 is fixed to the stator body 1. It is fixed to.

  In addition, as an example of the thermoplastic resin that integrally forms the bobbin support frame 12, the bolt mounting portion 13 in the stator body 1, the flange 21 and the core in the bobbin 2, and the mounting pin 3, PPS (Poly) having excellent heat resistance (Phenylene Sulfide) resin.

  When the resolver including the resolver stator 10 described above is applied as a means for detecting the rotation angle of a motor generator mounted on a hybrid vehicle, the end shield 41 of the shield body 4 is connected to the end of the motor generator in the axial direction. Try to face each other. Further, the resolver rotor is fastened to the rotor shaft of the motor generator so that the rotation center of the resolver rotor coincides with the rotation center of the rotor shaft of the motor generator.

In the resolver having the resolver stator 10 shown in FIG. 1 and FIG. 2 as a constituent element, when an AC voltage is applied to the excitation winding in the stator winding 23 of each bobbin 2, the electromagnetic winding induces in the stator winding 23 of each bobbin 2 An AC voltage is generated in the output winding.
When the resolver rotor rotates together with the rotor shaft, the shape of the resolver rotor is not a perfect circle, so that the gap between the tip of the magnetic member 22 of each bobbin 2 and the outer peripheral surface of the resolver rotor changes periodically. become.
Thereby, the reluctance between the magnetic body member 22 of each bobbin 2 and the resolver rotor fluctuates following the change of the gap, and the AC voltage generated at the output winding in the stator winding 23 of each bobbin 2 is It will fluctuate periodically.

In the resolver stator 10 shown in FIGS. 1 and 2, the end shield 41 and the side shield 42 constituting the shield body 4 are made of metal, and the bobbin 2 arranged in the circumferential direction of the bobbin support frame 12 is arranged. Since one end is covered with the end shield 41 of the shield body 4 and the row of the bobbins 2 arranged in the circumferential direction of the bobbin support frame 12 is surrounded by the side shield 42 of the shield body 4, The stator winding 23 is shielded from magnetic field noise and electric field noise generated by the motor generator, and the signal output from the output winding in the stator winding 23 of each bobbin 2 is not disturbed.
Therefore, when the change in voltage of this signal is continuously measured using the AC voltage generated in the output winding in the stator winding 23 of each bobbin 2 as a signal, the rotation angle of the resolver rotor, that is, the rotation angle of the motor generator is obtained. It can be detected accurately.

  Further, the mounting pin 3 formed on the bobbin 2 is inserted into the pin hole 41a of the end shield 41, and the mounting pin 3 is attached so that the shape of the tip portion of the mounting pin 3 is larger than the inner diameter of the pin hole 41a. The shield body 4 is thermally deformed to fix the shield body 4 to the stator body 1 and the end shield 41 covering one end of each bobbin 2 serves to protect the stator winding 23 of each bobbin 2. There is no increase in the number of points and the mounting space does not increase.

In the above-described embodiment, the motor generator is targeted. However, the present invention can also be applied to rotating electrical machines other than the motor generator.
In the embodiment described above, the number of attachment points of the bolt mounting part 13 on the outer peripheral part of the bobbin support frame 12 is three, but the number of attachment parts of the bolt mounting part 13 can be changed as necessary.
In the embodiment described above, the number of bobbins 2 provided on the inner peripheral portion of the bobbin support frame 12 is eight, but the number of bobbins 2 can be changed as necessary.
In the embodiment described above, two mounting pins 3 are provided for every other of the eight bobbins 2 arranged in the circumferential direction of the bobbin support frame 12. However, the bobbin 2 provided with the mounting pins 3 is provided. Can be selected as necessary, and the number of mounting pins 3 provided on one bobbin 2 can be changed as necessary.

  As described above, the resolver stator according to the present invention can cut off the stator winding from magnetic field noise and electric field noise, has the effect of not increasing the number of parts and mounting space, and is useful for resolver stators in general. is there.

DESCRIPTION OF SYMBOLS 1 Stator main body 2 Bobbin 3 Mounting pin 4 Shield main body 10 Resolver stator 12 Bobbin support frame 22 Magnetic body member 23 Stator winding 41 End shield 41a Pin hole 42 Side shield

Claims (1)

A space that includes a stator body having an annular bobbin support frame, a plurality of bobbins having a magnetic member and a stator winding, a mounting pin provided at one end of the bobbin, and a shield body, and is surrounded by the plurality of bobbins. A resolver stator in which a resolver rotor is disposed,
The bobbin is formed of a thermoplastic resin, and is provided on the inner periphery of the bobbin support frame so as to be aligned in the circumferential direction.
The mounting pin is integrally formed with the bobbin by a thermoplastic resin, and protrudes in parallel with the central axis of the bobbin support frame from one end of the bobbin;
The shield body includes an annular end shield that covers one end of each bobbin, and an annular end that protrudes from the outer peripheral edge of the end shield toward the bobbin support frame and extends in the circumferential direction of the end shield. It consists of side shields,
The end shield and the side shield are made of metal,
The end shield has a pin hole through which the mounting pin is inserted;
A resolver stator, wherein the mounting pin is inserted into the pin hole, and the tip of the mounting pin is thermally deformed so that the shape of the tip of the mounting pin is larger than the inner diameter of the pin hole.

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