JP2015206762A - resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resolver that includes a magnetic shield member shielding a rotor and stator from an external magnetic flux and nonetheless is easily attached to an object.SOLUTION: A resolver 100 comprises: a stator 11 that has a stator core 12 around which a three-phase coil 13 is wound; a ring-shaped rotor 21 that is provided on an outer peripheral side of the stator core 12 and is rotatable; a resin molded article 15 that has an electrical insulation property, and is integrally provided in the stator core 12 and supports the stator core 12; and a magnetic shield plate 1 that is provided in the resin molded article 15 so as to be adjacent to the stator 11 and the rotor 21 in a direction of a rotation center axis of the rotor 21, and has permeability. The magnetic shield plate 1 extends over further than the rotor 21 in a radial direction of the rotor 21 from the resin molded article 15, and is insulated from the stator core 12 by the resin molded article 15.

Description

  The present invention relates to a resolver.

  A resolver used for detecting a rotation angle includes a rotor that has a permanent magnet or the like and generates a magnetic flux and is rotatable, and a stator that has a winding and is fixedly disposed. The resolver detects the rotation angle of the rotor by detecting the induced current generated in the winding of the stator due to the change of the magnetic flux from the rotor by rotating. For example, as described in Patent Document 1, some resolvers are provided with a ring-shaped rotor that can rotate so as to surround a stator. This resolver has a ring-shaped stator core around which a winding is wound. Conventionally, an inlay is provided on the inner peripheral side of the stator core, and the stator has been directly attached and fixed to the attachment target by fitting the inlay to the attachment target. On the other hand, the rotor has been attached and fixed to a detection target for detecting rotation on the outer peripheral side thereof.

JP 2008-191073 A

  The resolver is often provided on the rotating shaft of the motor. In this case, the magnetic flux generated by the motor interferes with the magnetic flux generated by the rotor, and the induced current generated in the stator winding may change, thereby reducing the detection accuracy of the resolver. For this reason, the magnetic shielding body which shields both a rotor and a stator from the magnetic flux of a motor is needed. Further, it is necessary to prevent the resolver from being complicatedly attached to the object by providing the magnetic shield as described above.

  The present invention has been made to solve such problems, and an object thereof is to provide a resolver that includes a magnetic shield that shields the rotor and the stator from an external magnetic flux, but that can be easily mounted. To do.

  In order to solve the above-described problems, a resolver according to the present invention is a resolver that detects a rotational position of an object, and includes a stator having a stator core around which a winding is wound, and an outer periphery of the stator core. A ring-shaped rotor that can rotate integrally with the rotor, an insulator that is electrically insulated and is provided integrally with the stator core to support the stator core, and is adjacent to the stator and the rotor in the direction of the rotation center axis of the rotor. The magnetic shielding member is provided on the insulator and has magnetic permeability. The magnetic shielding member extends from the insulator over the rotor in the radial direction of the rotor, and is insulated from the stator core by the insulator.

The insulator may be provided so as to be interposed between the stator core and the winding.
The insulator may have a ring-shaped metal collar on the outer periphery, and the magnetic shielding member may be attached to the insulator by fitting a fitting hole into the metal collar.
The magnetic shielding member may have an edge for fixing.
The resolver may include a lead wire having a terminal to which a winding is connected at an end and extending through an insulator.

  According to the resolver according to the present invention, it is possible to facilitate the mounting while providing a magnetic shielding member that shields the rotor and the stator from an external magnetic flux.

1 is a perspective view of a resolver according to an embodiment of the present invention. It is the figure which looked at the cross-sectional side surface containing the rotation center axis | shaft of the rotor of the resolver of FIG. 1 from the direction II-II. FIG. 2 is a perspective view in which a magnetic shielding plate is removed from the resolver of FIG. 1. FIG. 2 is an exploded view of a stator and a magnetic shielding plate of the resolver in FIG. 1.

Hereinafter, a resolver 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Referring to FIG. 1, an outer rotor type resolver 100 that is a rotation angle sensor includes a resolver body 10 and a disk-shaped magnetic shielding plate 1 attached to the resolver body 10. The magnetic shielding plate 1 is a magnetic body made of a highly permeable material having magnetic permeability, and constitutes a magnetic shielding member.
The resolver body 10 includes a stator 11 and a rotor 21 that surrounds the outer periphery of the stator 11.

2 to 4, the stator 11 includes a cylindrical stator core 12 made of a magnetic material such as metal and having a plurality of teeth (not shown) along the circumferential direction, and teeth (not shown) of the stator core 12. And a three-phase winding 13 to be wound. The rotor 21 has a cylindrical shape and is provided so as to surround the outer periphery of the stator core 12. The rotor 21 includes a plurality of permanent magnets therein and is formed from a magnetic material, or is formed by mixing permanent magnet particles in the magnetic material. The inner peripheral surface of the rotor 21 forms a side surface of a polygonal column.
When the rotor 21 rotates in the circumferential direction of the stator core 12, an induced current is generated in the three-phase winding 13 of the stator 11. When the rotor 21 rotates, the mutual distance at each position in the circumferential direction changes between the inner peripheral surface of the rotor 21 and the outer peripheral surface of the stator core 12, and therefore the intensity and phase of the generated induced current change. . Then, a detection device (not shown) electrically connected to the three-phase winding 13 determines the rotation angle of the rotor 21 from the intensity and phase of the induced current that changes.

Further, a detailed structure around the stator 11 will be described.
2 to 4 together, the stator core 12 before the three-phase winding 13 is wound is disposed coaxially with the stator core 12 as shown in the state (a) of FIG. A cylindrical metal collar 14 is integrated by resin molding. A resin molded body 15 in which the stator core 12 and the collar 14 are integrated and has electrical insulation is integrally formed with the stator core 12 and the collar 14 by injection molding or the like. Since both the stator core 12 and the collar 14 are made of metal that is not easily deformed, the alignment on the same axis is easy. Here, the resin molding 15 constitutes an insulator.

As shown in the state (b) of FIG. 4, the resin molded body 15 has a columnar shape coaxially positioned with the stator core 12 and the collar 14, and fills the inner peripheral side of the stator core 12 and the collar 14. So exist and support these.
As shown in FIG. 2, the resin molded body 15 is attached to the stator core 12 so as to extend over the inner peripheral surface 12a of the stator core 12 and the end surfaces 12b and 12c on both sides and to be integrated with them. Further, the resin molded body 15 is attached to the collar 14 so as to extend over the inner peripheral surface 14a and both ends of the collar 14 and to be integrated with them.

Further, as shown in the state (b) of FIG. 4, the resin molded body 15 is formed with a plurality of molded body through holes 15 c penetrating in the cylinder axis direction.
As shown in the state (c) of FIG. 2 and FIG. 4, one lead wire 16 having a terminal 16a attached to each tip is inserted into each molded body through-hole 15c. 15, the terminal 16 a protrudes from an end surface 15 a opposite to the collar 14 across the stator core 12.

Further, as shown in the state (d) of FIG. 2 and FIG. 4, a disc-shaped cover plate 17 having a plurality of through holes 17 a that can be fixed through the lead wires 16 is provided in each through hole 17 a. The resin molded body 15 is assembled into a recess 15b formed on the end surface opposite to the end surface 15a. Thus, the cover plate 17 is fitted into the recess 15 b and fixed to the resin molded body 15, and the lead wire 16 is fixed to the resin molded body 15 via the cover plate 17.
Thereafter, the three-phase winding 13 is wound around a not-shown tooth of the stator core 12 from above the resin molded body 15, and both ends of the windings of each phase of the three-phase winding 13 after the winding are connected to the terminal 16a. .
Thereby, the stator assembly 30 is formed by the stator 11, the collar 14, the resin molded body 15, the lead wire 16, and the cover plate 17 as shown in FIG. Further, the rotor 21 is provided coaxially with the stator core 12 so as to surround the outer periphery of the stator 11 of the stator assembly 30. The resolver body 10 is configured by the stator assembly 30 and the rotor 21.

Further, as shown in the state (d) of FIGS. 1, 2, and 4, the magnetic shielding plate 1 is attached to the stator assembly 30.
The magnetic shielding plate 1 includes an annular plate-shaped flange portion 1a that forms an outer peripheral edge portion thereof, and a base portion 1b having a truncated cone-shaped outer shape that protrudes in the direction perpendicular to the flange portion 1a from the flange portion 1a on the center side. have. The flange portion 1a and the base portion 1b are integrally formed of a high permeability material having magnetic permeability. A fitting hole 1c having a shape matching the outer peripheral surface 14b of the collar 14 is formed at the center of the base 1b. Note that the base portion 1 b has a larger diameter than the rotor 21.

  The magnetic shielding plate 1 is attached to the resin molded body 15 so that the protruding side of the base portion 1b is opposite to the stator 11 and the resin molded body 15 is inserted into the fitting hole 1c of the base portion 1b from the concave portion 15b side. . At this time, the collar 14 is press-fitted into the fitting hole 1c, and the outer peripheral surface 14b of the collar 14 is tightly fitted into the fitting hole 1c. A ring-shaped protrusion 14c that protrudes radially outward from the outer peripheral surface 14b is integrally formed at the end of the collar 14 on the stator 11 side. For this reason, when the projection 14c comes into contact with the base 1b of the magnetic shielding plate 1, the press-fitting of the collar 14 is stopped. Thereby, the magnetic shielding plate 1 is fixed to the resin molded body 15. Therefore, the magnetic shielding plate 1 is adjacent to the stator core 12 and the rotor 21 with a space in the direction of the central axis of the stator core 12 and the collar 14, that is, the rotation central axis of the rotor 21, and perpendicular to the central axis. Extend.

In the stator assembly 30 provided with the magnetic shielding plate 1 on the resin molded body 15, the flange portion 1 a of the magnetic shielding plate 1 is used for attachment / fixation to the attachment target by screws or the like.
Further, the rotor 21 disposed around the stator 11 is attached and fixed to an object whose rotation is to be detected.
The resolver 100 is arranged with the stator 11 and the rotor 21 opposite to the external magnetic flux generation source, whereby the magnetic shielding plate 1 is interposed between the magnetic flux generation source and the stator 11 and the rotor 21. . Further, the magnetic shielding plate 1, the stator 11, and the rotor 21 are not directly connected to each other magnetically because the resin molded body 15 or air is interposed therebetween.
Therefore, the magnetic flux generated by the external magnetic flux generation source is taken in and stays in the magnetic shielding plate 1 having permeability, and is prevented from flowing to the stator 11 and the rotor 21 side. That is, the magnetic shielding plate 1 functions as a magnetic shield.

  As described above, the resolver 100 according to the embodiment of the present invention includes the stator 11 having the stator core 12 around which the three-phase winding 13 is wound, and the annular rotor 21 that is provided on the outer peripheral side of the stator core 12 and is rotatable. The resin molded body 15 that has electrical insulation and is provided integrally with the stator core 12 and supports the stator core 12, and the stator 11 and the rotor 21 so as to be adjacent to each other in the direction of the rotation center axis of the rotor 21. And a magnetic shielding plate 1 provided on the resin molded body 15 and having magnetic permeability. The magnetic shielding plate 1 extends from the resin molded body 15 over the rotor 21 in the radial direction of the rotor 21, and is insulated from the stator core 12 by the resin molded body 15.

  At this time, in the resolver 100, the stator 11 and the rotor 21 are arranged on the side opposite to the magnetic shielding plate 1 with respect to the magnetic generation source, so that the magnetic shielding plate 1 shields the magnetic flux from the magnetic generation source. . The magnetic shielding plate 1 extending over the rotor 21 in the radial direction of the rotor 21 can not only effectively shield the stator 11 and the rotor 21 from the magnetic flux of the magnetic generation source, but also an object for fixing the stator 11. It can also be used as an attachment site for an object. The magnetic shielding plate 1 having the above-described configuration facilitates attachment to a fixed object, thereby facilitating fixing of the stator 11 to the fixed object. Therefore, the resolver 100 can facilitate the attachment while shielding the rotor 21 and the stator 11 from the external magnetic flux.

In the resolver 100, the resin molded body 15 is provided so as to be interposed between the stator core 12 and the three-phase winding 13. Thereby, the resin molded body 15 also serves as an insulator for the stator core 12 and the three-phase winding 13. The number of parts of the stator 11 is reduced, and the structure related to the stator 11 can be reduced in size.
In the resolver 100, the resin molded body 15 has a ring-shaped metal collar 14 on the outer periphery, and the magnetic shielding plate 1 is attached to the resin molded body 15 with the fitting hole 1 c fitted into the collar 14. . Thereby, the rigidity of the site | part which attaches the magnetic shielding board 1 in the resin molding 15 improves. Therefore, the rigidity at the time of fixing the stator 11 improves. Further, the magnetic shielding plate 1 can be attached to the resin molded body 15 by press-fitting using a machine.
Moreover, in the resolver 100, the magnetic shielding board 1 has the flange part 1a for fixing. Thereby, attachment to the fixed object of the magnetic shielding board 1 becomes easy.
The resolver 100 also includes a lead wire 16 having a terminal 16 a to which the three-phase winding 13 is connected at the end and extending through the resin molded body 15. At this time, the terminal 16 a and the lead wire 16 are insulated from the resin molding 15 and shielded from the magnetic flux of the magnetic source by the magnetic shielding plate 1.

  DESCRIPTION OF SYMBOLS 1 Magnetic shielding board (magnetic shielding member), 1a Flange part (edge part), 11 Stator, 12 Stator core, 13 Three-phase winding, 14 Color, 15 Resin molding (insulator), 16 Lead wire, 16a Terminal, 21 Rotor, 100 resolver.

Claims (5)

In a resolver that detects the rotational position of an object,
A stator having a stator core wound with windings;
A ring-shaped rotor provided on the outer peripheral side of the stator core and rotatable integrally with the object;
An insulator having electrical insulation and provided integrally with the stator core to support the stator core;
A magnetic shielding member provided on the insulator so as to be adjacent to the stator and the rotor in the direction of the rotation center axis of the rotor, and having magnetic permeability;
The magnetic shielding member extends from the insulator over the rotor in the radial direction of the rotor and is insulated from the stator core by the insulator.   The resolver according to claim 1, wherein the insulator is provided so as to be interposed between the stator core and the winding. The insulator has a metal collar on the outer periphery,
The resolver according to claim 1, wherein the magnetic shielding member is attached to the insulator by fitting a fitting hole into the metal collar.   The resolver according to claim 1, wherein the magnetic shielding member has an edge portion to be fixed.   The resolver as described in any one of Claims 1-4 which has a terminal to which the said coil | winding is connected to an edge part, and is provided with the lead wire extended through the said insulator.

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