JP2021052533A - Resolver stator - Google Patents

Abstract

To provide a resolver stator with improved heat resistance.SOLUTION: A resolver stator comprises: an annular stator 11 having a plurality of teeth 13; ring-shaped insulation covers 14 which are provided on end faces 11a provided on both faces of the annular stator 11; and stator windings 17a which are wound around the plurality of teeth 13 and the ring-shaped insulation covers 14 covering the plurality of teeth 13. The resolver stator further comprises caps 20, each formed into a substantially annular shape, which are provided on both end face 11a sides of the annular stator 11. The caps 20 are each configured such that an end on the outer peripheral side of each of the caps 20 is fitted at least to either one of the ring-shaped insulation covers 14 or an annular part 12. Inside each of the caps 20, a potting material is injected and cured.SELECTED DRAWING: Figure 3

Description

The present invention relates to a resolver stator, and more particularly to a resolver stator having improved heat resistance.

Conventionally, a resolver has been used to detect the rotation of a rotating shaft, and examples thereof include the configuration of Patent Document 1. The resolver is composed of a rotor and a stator. A rotor fixed to a rotating shaft is arranged in the rotor opening of the stator. On the inner peripheral surface of the stator formed in an annular shape, a plurality of teeth extending toward the center of the stator are provided at equal intervals in the circumferential direction. A conductor is wound around each of the plurality of teeth to form a stator coil. The rotor is arranged in the rotor opening of the stator with a slight gap from the tip of the tooth.

When the rotor rotates with the axis of rotation, the gap between the rotor and the tip of the tooth changes periodically, changing the gap permeance. When an alternating current for excitation is passed through some coils, an output voltage is generated in the other coils according to the fluctuation of the gap, that is, the fluctuation of the magnetic permeability. The rotation angle of the rotor can be detected by detecting the difference in output voltage between a plurality of coils having different circumferential positions of the stator. The resolver is also placed in a high temperature environment and is also contained in oil. Therefore, in order to improve the heat resistance of the coil, AIW (polyamide-imide conducting wire) having excellent heat resistance may be used for the coil winding.

Japanese Unexamined Patent Publication No. 2003-302255

However, adopting AIW for the coil winding has been a cause of cost increase. Further, when used in oil, it is difficult to prevent the adhesion of high-temperature oil, and it is not easy to improve the heat resistance.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a resolver resolver stator having improved heat resistance that can be used even in oil.

The resolver stator according to the present invention is formed in an annular shape, and has an annular stator having a plurality of teeth protruding toward the center on the inner peripheral side and end faces provided on both sides of the annular stator in the central axial direction. A resolver stator including a ring-shaped insulating cover that covers the entire ring-shaped stator except for a part thereof, and a stator winding that is wound around a plurality of teeth via the ring-shaped insulating cover. The resolver stator is formed in an annular shape, and further includes caps provided on both end surface sides of the annular stator. Each of the caps has a ring-shaped insulating cover and an annular stator at the outer peripheral end of the cap. It is attached to at least one of the above, and a potting material is injected and cured inside the cap.

Further, the resolver stator according to the present invention has one or more injection holes for injecting a potting material into the internal space of the resolver stator in at least one of the caps, and the injection holes are injection holes. It is blocked by the potting material injected into.

Further, the ring-shaped insulating cover of the resolver stator according to the present invention is provided at the outer peripheral end portion extending outward in the radial direction and the outermost outer peripheral portion of the outer peripheral end portion at the outer peripheral end of the ring-shaped insulating cover, and the resolver is provided from the outer peripheral end portion. Each has a ring-shaped protrusion extending in a direction away from the annular stator in parallel with the central axis of the stator, and the entire circumference of the outer peripheral end of the cap is fixed in contact with the outer peripheral end.

According to the present invention, it is possible to provide a resolver stator which is provided with caps fixed on both sides of the annular portion and in which a potting material is injected into the cap and is cured. Therefore, the cap can shield heat and reduce the amount of high-temperature oil reaching the coil. Further, the coil is held by the injected potting material, and the coil can be made hard to vibrate. Therefore, the heat resistance and vibration resistance of the coil can be improved.

Further, according to the present invention, the injection hole for injecting the potting material into the internal space of the resolver stator provided in the cap is closed by the potting material injected through the injection hole. can do. Therefore, the injection hole of the potting material can be closed without adding a member for closing the injection hole. Therefore, a resolver stator in which a potting material is injected into the internal space can be realized at low cost.

Further, according to the present invention, it is possible to provide a resolver stator in which the entire circumference of the outer peripheral end of the cap provided on both sides of the resolver stator is fixed in contact with the outer peripheral end portion of the ring-shaped insulating cover. .. Therefore, the caps can be firmly fixed to both sides of the resolver stator so that oil does not enter the inside. Therefore, a resolver stator with improved heat resistance can be realized.

It is a front view of the stator for a resolver which concerns on embodiment of this invention. It is a front view which showed the state which removed the cap and the potting material which is internally filled in the stator for a resolver of FIG. It is a partial cross-sectional view of the stator for a resolver including the AA cross section in FIG. It is the C part enlarged view of FIG. FIG. 1 is a cross-sectional view taken along the line BB in FIG. 1 of the cap. It is a figure which showed the method of injecting a potting material into a stator for a resolver.

Embodiment The resolver stator 100 according to the embodiment of the present invention shown in FIG. 1 will be described. FIG. 1 is a front view showing a resolver stator 100 according to an embodiment of the present invention. Further, FIG. 2 is a diagram showing a state in which the cap 20 and the potting material X to be internally filled are removed from the resolver stator of FIG. Further, FIG. 3 is a partial cross-sectional view of the resolver stator 100 including the AA cross section in FIG. Further, FIG. 4 is an enlarged view of part C of FIG. Further, FIG. 5 is a cross-sectional view taken along the line BB in FIG. 1 of the cap 20.

The resolver stator 100 is connected to an annular stator 11, a ring-shaped insulating cover 14 that covers the entire surface of the annular stator 11 except for a part thereof, a stator winding 17a wound around the annular stator 11, and a stator winding 17a. The stator wiring 18 and the cap 20 are provided.

FIG. 2 shows a front view of the resolver stator 100 in a state where the cap 20 and the potting material X to be internally filled are removed so that the internal structure of the resolver stator 100 can be easily understood.

The annular stator 11 has an annular portion 12 and a plurality of teeth 13, and end faces 11a are provided on both sides in the central axis direction. The teeth 13 are formed on the inner peripheral side of the annular portion 12 so as to project from the annular portion 12 toward the center of the annular portion 12 at predetermined angular intervals. The tip of each tooth 13 projects and extends to both sides of the annular portion 12 in the circumferential direction. That is, the tip of each tooth 13 is formed in a T shape. The annular stator 11 composed of the annular portion 12 and the plurality of teeth 13 is formed by laminating a plurality of thin steel plates as conductors in the central axis direction.

A stator winding 17a is wound between the tip end portion and the base end portion of each tooth 13. The stator winding 17a is wound around each tooth 13 to form a plurality of coils 17. The stator winding 17a is made of a conductive metal. The plurality of coils 17 are composed of a one-phase exciting coil and a two-phase output coil. When the exciting coil is excited by an AC voltage, the gap between the teeth 13 and the rotor changes periodically as the rotor (not shown) arranged in the center of the stator rotates, and a two-phase voltage is generated. By detecting this two-phase voltage, the rotation angle can be detected.

The end of the stator wiring 18 is fixed to the outer peripheral portion of the resolver stator 100. The end of the stator winding 17a wound around each tooth 13 is connected to the corresponding stator wiring 18.

FIG. 3 is a partial cross-sectional view of the resolver stator 100 including the AA cross section in FIG. The state in which the potting material X is injected into the internal space of the resolver stator 100 to which the cap 20 is attached and is cured is shown. The potting material X injected into the resolver stator 100 is filled in the internal space of the resolver stator 100 to prevent the teeth 13 and the coil 17 formed in the teeth 13 from vibrating. Before attaching the cap 20, the coil 17 may be coated with varnish, a sheet of resin or the like formed in an annular shape may be placed over the entire coil 17, the cap 20 may be attached, and the potting material X may be injected. In this case, the injected potting material X efficiently fills the space between the cap 20 and the surface of the coil 17 adjacent to the cap 20.

The ring-shaped insulating cover 14 covers the entire annular stator 11 except for a part of the annular stator 11, such as the outer peripheral surface of the annular stator 11, a part of the end surface 11a, and the tip of each tooth 13.
FIG. 4 shows a partially enlarged view of the outer peripheral portion of the resolver stator 100. The ring-shaped insulating cover 14 is provided on the outer peripheral portion of the ring-shaped insulating cover 14 at the outer peripheral end portion 15 extending outward in the radial direction of the ring-shaped insulating cover 14 and the outer peripheral end portion 15 on the entire outer peripheral portion of the outer peripheral end portion 15. A substantially cylindrical ring-shaped protrusion 16 extending in a direction away from the annular stator 11 in parallel with the central axis of the resolver stator 100. The ring-shaped insulating cover 14 is made of PPS (polyphenylene sulfide), which is a thermoplastic resin, or the like.

FIG. 5 shows a sectional view taken along line BB in FIG. 1 of the cap 20.
Caps 20 are attached to both end faces 11a of the annular stator 11. The cap 20 is substantially annular, and the outer diameter of the cap 20 is formed to be slightly smaller than the outer diameter of the annular stator 11. Each cap 20 is formed on a ring-shaped insulating cover 14 in parallel with the central axis of the resolver stator 100 on the entire circumference of the radius portion 22 which is formed substantially annularly and substantially flat and the outermost peripheral end of the radius portion 22. It has a cylindrical portion 26 extending in an approaching direction.

The radius portion 22 formed in a substantially annular shape is provided with a central hole 23 in the center. Further, at least one injection hole 24 is provided in the radial portion 22 of at least one of the caps 20. The injection hole 24 is a hole for injecting a potting material X such as a molten epoxy resin into the space inside the cap 20. The cap 20 is formed by molding PPS or the like. One or more injection holes 24 may be formed in the cap 20.

Further, the radius portion 22 is provided with a wiring hole 25 through which the stator wiring 18 passes. The stator wiring 18 is passed through a wiring hole 25 of one of the caps 20 provided on both sides of the annular stator 11.

All the injection holes 24 and the wiring holes 25 of each cap 20 are closed by injecting the potting material X into the inside after the stator wiring 18 is passed through the wiring holes 25 of one cap 20.

FIG. 4 is an enlarged view of part C of FIG. Of the ends of the cylindrical portion 26 of the cap 20, the end portion on the side not in contact with the radial portion 22 is liquid-tightly attached to the outer peripheral end portion 15 of the ring-shaped insulating cover 14 on the entire circumference. The end of the cylindrical portion 26 is fixed by being welded to the outer peripheral end portion 15 of the ring-shaped insulating cover 14 after the ring-shaped insulating cover 14, the stator winding 17a, and the stator wiring 18 are incorporated into the annular stator 11. To. The end portion of the cylindrical portion 26 on the side not in contact with the radial portion 22 and the outer peripheral end portion 15 are heated and melted, and are crimped to each other in that state. After that, the end portion of the cylindrical portion 26 that has been cooled and crimped and the outer peripheral end portion 15 are fixed. The D portion in FIG. 4 is a welded portion between the end portion of the cylindrical portion 26 and the outer peripheral end portion 15. The cap 20 is liquid-tightly attached to the ring-shaped insulating cover 14 by welding and fixing the end portion of the cylindrical portion 26 and the outer peripheral end portion 15. The end portion of the cylindrical portion 26 and the outer peripheral end portion 15 may be adhered to each other with an adhesive.

The caps 20 provided on both end faces 11a of the annular stator 11 may have their respective ends on the outer peripheral side of the cap 20 attached to the annular portion 12. When each end on the outer peripheral side of the cap 20 is attached to the annular portion 12, it is adhered by welding or an adhesive, and is attached to both end faces in a liquid-tight manner.

The injection hole 24 is a potting that is injected into the internal space of the resolver stator 100 after injecting a potting material X such as epoxy resin into the internal space of the resolver stator 100 sealed with caps 20 from both sides. It is blocked by material X. Further, the wiring hole 25 through which the stator wiring 18 of one cap 20 is passed and the wiring hole 25 through which the stator wiring 18 of the other cap 20 is not passed are closed by the potting material X injected together. That is, all the injection holes 24 and the wiring holes 25 provided in the respective caps 20 are closed and sealed by the potting material X to be injected.

A method of injecting the potting material X into the internal space of the resolver stator 100 will be described with reference to FIG. When the potting material X is injected, a cylindrical jig E is used. The outer diameter of the jig E is substantially the same as the diameter of the virtual circle formed by the central hole 23 of the cap 20 and the tip surfaces of the plurality of teeth 13 provided in the circumferential direction.

First, except for the injection of the potting material X, the jig E is passed through the center hole 23 of the cap 20 of the resolver stator 100 that has been assembled and the rotor opening of the annular stator 11. Next, the resolver stator 100 passed through the jig E is put into the vacuum chamber. After that, the potting material X is injected through the injection hole 24 to perform vacuum defoaming. At this time, the flow of the potting material X flowing toward the center of the annular stator 11 is blocked by the outer surface of the jig E. That is, the potting material X is defined by the inner surface of the cap 20, that is, the surface adjacent to the annular stator 11, the surface of the coil 17 adjacent to the cap 20, and the outer peripheral surface of the jig E. The annular space is filled. After confirming that all the injection holes 24 and the wiring holes 25 are sealed with the potting material X, the injection work is completed.

After that, the potting material is cured, and the jig E is removed from the resolver stator 100. The inner peripheral surface of the resolver stator 100 of the finished product is an inner peripheral surface formed by the tip surface of the teeth 13 and the hardened potting material X. That is, in the completed resolver stator 100, all the coils 17 are sealed by the inner surface of the cap 20, that is, the surface adjacent to the annular stator 11, the tip surface of the teeth 13, and the cured potting material X. Has been done. Although air bubbles may be present inside the resolver stator 100, the thermal conductivity of air of 0.02 (Wm-1 * K-1) is the thermal conductivity of epoxy resin of 0.21 (Wm-). Since it is lower than 1 * K-1) and rather has a high heat insulating effect, there may be a space containing air inside the resolver stator 100.

The resolver stator 100 according to the embodiment of the present invention is provided with caps 20 which are formed in a substantially annular shape and are provided on both side end faces 11a in the central axis direction of the annular stator 11, and each of the caps 20 is provided. The outer peripheral end of the cap 20 is attached to at least one of the ring-shaped insulating cover 14 and the annular portion 12, and the potting material X is injected and cured inside the cap 20.

Therefore, the resolver stator 100 according to the embodiment of the present invention includes the cap 20, the inner surface of the cap 20, that is, the surface adjacent to the annular stator 11, the tip surface of the teeth 13, and the hardened potting. All the coils 17 are sealed by the material X. Therefore, the heat resistance of the resolver stator 100 can be improved. In particular, the heat resistance of the resolver stator 100 used in oil can be improved.

Further, the cap 20 provided in the resolver stator 100 according to the embodiment of the present invention has an injection hole 24 for injecting the potting material X into the resolver stator 100, and at least one of the caps 20 is provided. The injection hole 24 is closed by the potting material X injected into the injection hole 24.

Therefore, the resolver stator 100 according to the embodiment of the present invention does not require a dedicated member for closing the injection hole 24. Therefore, the resolver stator 100 with improved heat resistance can be realized at low cost.

Further, the ring-shaped insulating cover 14 of the resolver stator 100 according to the embodiment of the present invention has an outer peripheral end portion 15 extending outward in the radial direction and an outermost peripheral portion 15 at the outer peripheral end of the ring-shaped insulating cover 14. Each of the outer peripheral end portion 15 has a ring-shaped protrusion 16 extending in a direction away from the annular stator 11 in parallel with the central axis of the resolver stator, and the entire circumference of the outer peripheral end of the cap 20 is the outer circumference. It abuts and is fixed to the end portion 15.

Therefore, the resolver stator 100 according to the embodiment of the present invention can have a structure capable of firmly fixing the provided cap 20. Therefore, the heat resistance of the resolver stator 100 can be reliably improved. In particular, the heat resistance of the resolver stator 100 used in oil can be reliably improved.

11 annular stator, 11a end face, 13 teeth, 14 ring-shaped insulating cover,
15 Outer peripheral end, 16 ring-shaped protrusion, 17a stator winding, 20 cap,
24 Injection holes.

Claims (3)

An annular stator (11) formed in an annular shape and having a plurality of teeth (13) protruding toward the center at predetermined angles on the inner peripheral side, and an annular stator (11).
A ring-shaped insulating cover (14) provided on each of the end faces (11a) provided on both sides of the annular stator (11) in the central axial direction and covering the entire surface except for a part of the annular stator (11). ,
A resolver stator comprising a stator winding (17a) wound around each of the plurality of teeth (13) via the ring-shaped insulating cover (14).
The resolver stator is further provided with caps (20) formed in a substantially annular shape and provided on both side surfaces of the annular stator (11) in the central axis direction.
In each of the caps (20), the outer peripheral end of the cap (20) is attached to at least one of the ring-shaped insulating cover (14) and the annular stator (11).
A resolver stator in which a potting material is injected and cured inside the cap (20). The cap (20) has at least one injection hole (24) for injecting a potting material into the resolver stator in at least one of the caps (20).
The resolver stator according to claim 1, wherein the injection hole (24) is closed by a potting material injected into the injection hole (24). The ring-shaped insulating cover (14) includes an outer peripheral end portion (15) extending outward in the radial direction at the outer peripheral end of the ring-shaped insulating cover (14).
A ring-shaped protrusion (16) provided at the outer peripheral end portion (15) and extending from the outer peripheral end portion (15) in a direction away from the annular stator (11) in parallel with the central axis of the resolver stator, respectively. Have and
The resolver stator according to claim 1 or 2, wherein the entire circumference of the outer peripheral end of the cap (20) is in contact with and fixed to the outer peripheral end (15).

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