JP2013198268A - Resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resolver capable of preventing a crossover from being damaged by preventing the crossover from being brought into contact with a cover member.SOLUTION: A resolver 10 includes a resolver rotor 13 fixed to a rotating shaft 11, and a resolver stator 12 arranged outside the resolver rotor 13 in a radial direction to include a plurality of tooth parts 46 with coils 43 wound around on the inner circumferential side thereof in a circumferential direction with a space. The resolver stator 12 includes a stator core 42 having the tooth parts 46, and an insulator 44 for covering an axial direction end surface of the stator core 42, and the insulator 44 includes guide parts 50a, 44a for guiding a crossover 43a among the coils 43. The resolver includes a cover member 52 having a covering part 53a for covering the crossover 43a guided by the guide parts 50a, 44a with a housing groove 60 for housing the crossover 43a formed between the guide parts 50a, 44a and the covering part 53a.

Description

  The present invention relates to a resolver used for detecting a rotation angle (rotation position) of a rotation shaft.

  The resolver is one of angle detection devices used to detect the rotation angle (rotation position) of the rotation shaft, and includes a resolver stator and a resolver rotor. The resolver stator is formed in an annular shape, and includes a plurality of teeth portions (teeth portions) wound with coils on the inner peripheral side thereof at intervals in the circumferential direction. The resolver rotor is disposed with a gap inward in the radial direction of the resolver stator, and is attached to a rotary shaft supported by the housing via a rolling bearing so as to be integrally rotatable.

  Moreover, as shown in the following Patent Document 1, the resolver stator includes a stator core having the tooth portion and an insulator that covers an end surface in the axial direction of the stator core, and the tooth portion is insulated from the coil by the insulator. . In addition, the insulator is provided with a crossover pin for guiding a crossover that is spanned between the coils.

JP 2011-151973 A

The resolver as described above may be provided with a pair of cover members that cover the resolver stator from both sides in the axial direction in order to protect the coil wound around the tooth portion of the resolver stator from the outside. Such a pair of cover members are welded to each other by vibration welding or ultrasonic welding, or are directly welded to the insulator.
Further, the cover member may cover and protect not only the coil wound around the tooth portion but also the crossover wire. However, if the cover member and the crossover wire rub against each other due to vibrations caused by welding of the cover member or vibrations when the rotary device is used, the crossover wire is damaged, causing disconnection or insulation failure.

  The present invention has been made in view of such circumstances, and provides a resolver capable of preventing contact between the connecting wire and the cover member and preventing damage to the connecting wire caused by friction between the two. The purpose is to do.

  The present invention includes a resolver rotor fixed to a rotating shaft, and a plurality of teeth portions disposed on the radially outer side of the resolver rotor and wound with a coil on the inner peripheral side thereof, spaced apart in the circumferential direction. A resolver stator, and the resolver stator includes a stator core having the teeth portion and an insulator that covers an axial end surface of the stator core, and the insulator includes a guide portion that guides the connecting wire between the coils. A resolver provided with a cover member having a covering portion covering the connecting wire guided by the guide portion, and a receiving groove for storing the connecting wire is provided between the guide portion and the covering portion. It is formed.

  According to the resolver of the present invention, since the accommodation groove for accommodating the crossover is formed between the guide for guiding the crossover and the cover of the cover member, direct contact between the crossover and the cover Can be suppressed. Therefore, it is possible to suppress damage to the crossover line due to friction between the crossover line and the covering portion.

It is preferable that the receiving groove is formed on the guide portion side.
With such a configuration, the connecting wire can be positioned by the accommodation groove before the cover member is mounted.

The housing groove is preferably formed deeper than the wire diameter of the jumper wire.
With such a configuration, the crossover wire can be completely accommodated in the accommodation groove, and the cover member can be reliably prevented from contacting the crossover wire.

  According to the resolver of the present invention, it is possible to prevent contact between the connecting wire and the cover member, and to prevent damage to the connecting wire due to friction between the two.

It is side surface sectional drawing which shows the resolver which concerns on the 1st Embodiment of this invention. It is a front view which shows the resolver stator and resolver rotor of the resolver shown by FIG. It is a front view which expands and shows a part of resolver stator shown by FIG. It is a front view which shows the stator core of the resolver stator shown by FIG. It is a perspective view which shows the resolver stator shown by FIG. It is a perspective view which shows the state which mounted | wore the resolver stator shown by FIG. 2 with the cover member. It is a perspective view which shows the state which decomposed | disassembled the cover member shown by FIG. It is side surface sectional drawing which expands and shows a part of resolver stator shown by FIG. It is side surface sectional drawing which expands and shows a part of resolver stator in the 2nd Embodiment of this invention. It is side surface sectional drawing which expands and shows a part of resolver stator in the 3rd Embodiment of this invention.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view showing a resolver according to the first embodiment of the present invention.
The resolver 10 of the present embodiment is used for detecting the rotation angle (rotation position) of the rotation shaft 11 of a motor generator used in a hybrid vehicle, for example. The rotating shaft 11 is rotatably supported in the housing 35 by a rolling bearing 14 and a rolling bearing (not shown) provided at a position away from the rotating bearing 14 in the axial direction. Further, a rotor of a motor generator (not shown) is fixed to the rotating shaft 11.

  The resolver 10 includes a resolver stator 12 fixed to the housing 35, and a resolver rotor 13 disposed radially inward of the resolver stator 12. Furthermore, the resolver 10 of the present embodiment includes a rolling bearing 14 that rotatably supports the rotating shaft 11 with respect to the housing 35, and the resolver stator 12 and the rolling bearing 14 are formed as one unit via the case member 15. It is assembled integrally. In the present embodiment, the mounting portion 16 is formed integrally with the rotating shaft 11, and the resolver rotor 13 is mounted on the mounting portion 16 so as to be integrally rotatable. The attachment portion 16 may be a sleeve separate from the rotary shaft 11, and the resolver rotor 13 may be fixed to the rotary shaft 11 via this sleeve.

  The rolling bearing 14 is concentrically disposed on the radially outer side of the inner ring 19 with the inner ring raceway 18, and can roll between the outer ring 21 having the outer ring raceway 20, and the inner ring raceway 18 and the outer ring raceway 20. And a plurality of rolling elements 22 arranged on the surface. The rolling bearing 14 of the present embodiment is a ball bearing provided with balls as the rolling elements 22. The outer ring 21 of the rolling bearing 14 is fixed to the case member 15, and the inner ring 19 is fixed to a position close to the resolver rotor 13 of the rotating shaft 11 (attachment portion 16). That is, the rolling bearing 14 is provided between the case member 15 and the rotating shaft 11, and enables the case member 15 and the rotating shaft 11 to rotate relative to each other.

  On the outer peripheral surface of the mounting portion 16 between the resolver rotor 13 and the rolling bearing 14, a plurality of oil supply ports 17 are formed at predetermined locations in the circumferential direction. The oil supply port 17 is connected to a hydraulic pump (not shown) via an oil supply path (not shown) formed in the rotary shaft 11. When this hydraulic pump is driven, the lubricating oil is injected at a high pressure from the oil supply port 17 outward in the radial direction, and the rolling bearing 14 is lubricated.

  FIG. 2 is a front view showing the resolver stator 12 and the resolver rotor 13, and FIG. 3 is an enlarged front view showing a part of the resolver stator 12. The resolver stator 12 is formed in an annular shape, and includes a stator core 42, a coil 43, and an insulator 44. As shown in FIG. 1, the stator core 42 is attached by fitting the outer peripheral surface thereof to the inner peripheral surface of the case member 15.

  As shown in FIG. 1, the case member 15 is attached to the housing 35 via a fixing ring 34. The fixing ring 34 has a plurality of boss portions 36 at regular intervals in the circumferential direction, and female screw holes 37 are formed in the boss portions 36. The fixing ring 34 is overlaid on the flange portion 31 of the case member 15, and the bolt 38 inserted into the hole 8 formed in the housing 35 and the hole 32 formed in the flange portion 31 is connected to the female screw hole 37 of the boss portion 36. Screwed on. As a result, the case member 15 is fixed to the housing 35.

  FIG. 4 is a front view showing the stator core 42, and FIG. 5 is a perspective view showing the resolver stator 12. The stator core 42 is made of a magnetic material such as a single layer or a plurality of layers of silicon steel plates, and has a ring-shaped annular portion 45 and a plurality of protrusions projecting radially inward from the inner peripheral surface 45a of the annular portion 45. The tooth portion 46 is integrally provided (eight in the illustrated example). The plurality of tooth portions 46 are formed at regular intervals in the circumferential direction. Each tooth portion 46 includes a base portion 46a and a distal end portion 46b. The base portion 46a has a smaller width in the circumferential direction than the distal end portion 46b, and the distal end portion 46b is formed in a shape that greatly extends from the base portion 46a to both sides in the circumferential direction. Has been. The exciting and output coils 43 are wound around the base portion 46 a of the tooth portion 46.

  As shown in FIGS. 2 and 5, the insulator 44 is formed in an annular shape by an insulating material such as synthetic resin. Moreover, the insulator 44 is each arrange | positioned at the axial direction both end surfaces of the stator core 42, as FIG. 1 shows. As shown in FIG. 3, the insulator 44 has a covering portion 48 that covers the tooth portion 46 of the stator core 42, and the covering portion 48 insulates the tooth portion 46 from the coil 43.

  The covering portion 48 of the insulator 44 has a pair of radial wall portions 50a and 50b protruding outward in the axial direction, and the coil 43 is wound between the pair of wall portions 50a and 50b. The insulator 44 disposed on one surface of the stator core 42 in the axial direction is formed with a connector portion 51 having a terminal for connecting the coil 43 (see FIGS. 2 and 5).

  Further, as shown in FIG. 3, the wall portion 50 a arranged on the outer side in the radial direction is between the coil 43 and the coil 43 (between two coils 43 adjacent in the circumferential direction or another coil 43 therebetween. It functions as a guide portion for guiding the crossover wire 43a provided between the two coils 43). Further, in the insulator 44, between the wall portions 50a adjacent to each other in the circumferential direction, similarly to the wall portion 50a, a protruding portion 44a that functions as a guide portion of the crossover wire 43a protrudes in the axial direction. The crossover wire 43a is disposed on the radially outer side of the wall 50a and the protrusion 44a.

  As shown in FIG. 2, the resolver rotor 13 is formed in a substantially elliptical shape when viewed from the front (viewed in the axial direction), and its outer peripheral surface faces the teeth portion 46 of the resolver stator 12 with a gap therebetween. Yes. When the rotating shaft 11 rotates, the resolver rotor 13 also rotates integrally, and the size of the gap between each tooth portion 46 of the resolver stator 12 and the resolver rotor 13 changes. When an alternating current is passed through the exciting coil 43 of the resolver stator 12, an output corresponding to the change in the size of the gap is generated in the output coil 43. Based on this output, the rotating shaft 11 rotation angles can be detected. The exciting coil 43 is provided for all the tooth portions 46, and the output coil 43 includes a SIN output coil 43 and a COS output coil 43, which are provided for the plurality of tooth portions 46. Are provided alternately in the circumferential direction. And the amplitude change of the output voltage of the coil 43 for SIN output and the coil 43 for COS output is 90 degrees out of phase, and the rotation angle of the rotating shaft 11 is detected by signal processing this output voltage. Can do.

  As shown in FIG. 1, the resolver 10 further includes a cover member 52 that covers the coil 43. 6 is a perspective view showing a state in which the cover member 52 is attached to the resolver stator 12, and FIG. 7 is a perspective view showing a state in which the cover member 52 is disassembled. As shown in FIGS. 6 and 7, the cover member 52 includes an annular first cover portion 53 and a second cover portion 54 that respectively cover the coil 43 from both axial sides of the resolver stator 12, and adjacent tooth portions. It is comprised between the some pillar part 55 which is arrange | positioned between 46 and connects the 1st and 2nd cover parts 53 and 54 mutually.

  The first cover part 53 is formed in an annular shape, and a box-shaped connector cover 56 that covers one axial side of the connector part 51 (upper side in FIG. 6) is fixed to the outer periphery thereof. As shown in FIG. 1, the first cover portion 53 is formed in an L-shaped cross section by an annular portion 53a and an annular plate portion 53b. The annular plate portion 53 b covers the coil 43 on one axial side (left side in FIG. 1) of the stator core 42 from the outside in the axial direction, and the annular portion 53 a is fitted to the outside in the radial direction of the wall portion 50 a of the insulator 44. Yes.

  The second cover portion 54 is formed in an annular shape similarly to the first cover portion 53, and is formed in an L-shaped cross section by an annular portion 54a and an annular plate portion 54b. The annular plate portion 54b covers the coil 43 on the other axial side of the stator core 42 (the right side in FIG. 1) from the outside in the axial direction, and the annular portion 54a is fitted to the outside in the radial direction of the wall portion 50a of the insulator 44. Yes.

  As shown in FIG. 7, axial end portions 55 a of a plurality (eight in the illustrated example) of column portions 55 are fixed to the annular plate portion 53 b of the first cover portion 53 at regular intervals in the circumferential direction. ing. The other axial end 55b of the column portion 55 is welded to the annular plate portion 54b of the second cover portion 54 by vibration welding, ultrasonic welding, or the like. As shown in FIGS. 2 and 6, the column portion 55 is disposed between the adjacent tooth portions 46.

FIG. 8 is an enlarged side sectional view showing a part of the resolver stator 12.
In the insulator 44, a housing groove 60 that is recessed radially inward is formed on the outer peripheral surface of the base end portion (lower portion in FIG. 8) of the radially outer wall portion 50a. In the housing groove 60, the above-described connecting wire 43a is housed. And the annular part 53a of the 1st cover part 53 is arrange | positioned at the radial direction outer side of the wall part 50a, and functions as the coating | coated part which coat | covers the crossover wire 43a from a radial direction outer side.

  As described above, one end portion 55b (see FIGS. 6 and 7) of the column portion 55 of the first cover portion 53 is welded to the second cover portion 54 by vibration welding or the like. In addition, if the annular portion 53a of the first cover portion 53 and the crossover wire 43a are in contact with each other, the two may rub against each other due to vibration, and the crossover wire 43a may be damaged, resulting in disconnection or insulation failure. Further, if the crossover wire 43a and the annular portion 53a are rubbed with each other by vibration transmitted from the housing 35 or the like during use of the resolver 10, the crossover wire 43a may be similarly damaged. In this regard, in the present embodiment, the housing groove 60 is formed in the wall portion 50a, and the crossover wire 43a is housed in the housing groove 60, so that the annular portion 53a is prevented from contacting the crossover wire 43a. The crossover wire 43a is not damaged by vibrations or the like accompanying the welding operation.

  The housing groove 60 is formed deeper inward in the radial direction than the wire diameter of the crossover wire 43a. Thereby, the whole crossover wire 43a can be accommodated in the accommodation groove | channel 60, and the contact of the crossover wire 43a and the annular ring part 53a can be prevented reliably. Further, by accommodating the connecting wire 43a in the receiving groove 60, the connecting wire 43a can be positioned in the axial direction. Therefore, it is possible to prevent the crossover wire 43a from being displaced when the first cover portion 53 is attached.

  As shown in FIG. 8, the accommodation groove 60 is formed widely in the axial direction in order to accommodate the plurality of crossover wires 43 a side by side in the axial direction (vertical direction in FIG. 8). With such a configuration, a plurality of crossover wires 43a can be accommodated without increasing the radial depth of the accommodation groove 60. In other words, since it is not necessary to form the receiving groove 60 deep in the radial direction, there is no need to increase the radial thickness of the wall 50a, and the resolver 10 is not enlarged in the radial direction.

  The depth in the radial direction of the housing groove 60 is not necessarily larger than the wire diameter of the crossover wire 43a, and there is a gap between the wall portion 50a and the annular portion 53a of the first cover portion 53. If the contact between the ring portion 53a and the crossover wire 43a can be avoided, the depth of the accommodation groove 60 may be smaller (shallow) than the wire diameter of the crossover wire 43a.

  As shown in FIG. 5, the housing groove 60 as described above is formed not only on the wall portion 50 a of the insulator 44 but also on the projection portion 44 a that guides the crossover wire 43 a, and this projection portion 44 a and the first cover portion are formed. The connecting wire 43a disposed between the 53 annular portions 53a is also prevented from contacting the annular portion 53a.

FIG. 9 is an enlarged side sectional view showing a part of the resolver stator in the second embodiment of the present invention.
In the present embodiment, an accommodation groove 60 for accommodating the crossover wire 43 a is formed on the inner peripheral surface of the annular portion 53 a in the first cover portion 53. Since other configurations are the same as those of the first embodiment, detailed description thereof is omitted.

  Also in this embodiment, the same operational effects as those of the first embodiment are obtained. However, in order to form the accommodation groove 60 in the annular portion 53a of the first cover portion 53, it is necessary to increase the radial thickness dimension a of the annular portion 53a. There is a possibility that the directional dimension is enlarged and the resolver 10 is enlarged in the radial direction. Further, since the connecting wire 43a is not positioned in the axial direction by the wall portion 50a, there is a possibility that the connecting wire 43a comes into contact with the connecting wire 43a when the first cover portion 53 is attached and the connecting wire 43a moves. is there. Therefore, it can be said that the first embodiment is more advantageous with respect to these points.

FIG. 10 is an enlarged side sectional view showing a part of the resolver stator in the third embodiment of the present invention.
In the present embodiment, the housing groove 60 for housing the crossover wire 43 a is formed on both the outer peripheral surface of the wall portion 50 a of the insulator 44 and the inner peripheral surface of the annular portion 53 a of the first cover portion 53. ing. Since other configurations are the same as those of the first embodiment, detailed description thereof is omitted.

Also in this embodiment, the same operational effects as those of the first embodiment are obtained.
Further, in the present embodiment, it is only necessary to form the shallow accommodating groove 60 in both the wall portion 50a and the annular portion 53a, and therefore it is not necessary to increase the thickness dimension of both. Therefore, the enlargement of the resolver 10 in the radial direction can be suppressed. Further, the crossover wire 43a can be positioned by the accommodation groove 60 of the wall 50a.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims.
For example, the shape of the cover member 52 is not limited to the above-described embodiment, and it is sufficient that the cover member 52 has at least a covering portion (annular portion) 53a that covers the crossover wire 43a. Further, the cover member 52 may be directly welded to the insulator 44. Further, the cover member 52 may be configured to include only the first cover portion 53 and omit the second cover portion 54. The number of crossovers 43a guided by the wall 50a and the protrusion 44a of the insulator 44 can be changed as appropriate.

The number and shape of the tooth portions of the resolver stator 12, the number of windings of the coil, the shape of the insulator 44, the shape of the outer peripheral surface of the resolver rotor 13, and the like can be appropriately changed. Good.
In the above-described embodiment, the example in which the present invention is applied to the resolver 10 for detecting the rotation angle of the rotation shaft 11 of the motor generator has been described. However, the resolver for detecting the rotation angle of the rotation shaft of other devices is described. The present invention may be applied to 10.

  10: Resolver, 11: Rotating shaft, 12: Resolver stator, 13: Resolver rotor, 43: Coil, 44: Insulator, 44a: Projection part (guide part), 46: Teeth part, 50a: Wall part (guide part), 52: Cover member, 53: First cover part, 53a: Ring part (cover part)

Claims (3)

A resolver rotor fixed to the rotating shaft, and a resolver stator that is arranged on the radially outer side of the resolver rotor and includes a plurality of teeth portions wound with a coil on the inner peripheral side, spaced apart in the circumferential direction; The resolver stator includes a stator core having the teeth portion and an insulator that covers an axial end surface of the stator core, and the insulator includes a guide portion that guides a jumper between the coils. A resolver,
A cover member having a covering portion that covers the connecting wire guided by the guide portion;
A resolver characterized in that an accommodation groove for accommodating the crossover is formed between the guide portion and the covering portion.   The resolver according to claim 1, wherein the receiving groove is formed on the guide portion side.   The resolver according to claim 1 or 2, wherein the receiving groove is formed deeper than a wire diameter of the crossover wire.

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