JP2018013426A - Resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resolver having terminal pins difficult to connect with water or foreign substances in cooled oil, which makes electric corrosion generate less frequently.SOLUTION: A resolver 1 includes: a plurality of terminal pins 30 arranged at intervals for electrically connecting a stator coil to a lead wire; a terminal pin base board part 42 in which the terminal pins 30 are inserted; a cover member 24 over the terminal pins 30; a varnish 70 filled around the terminal pins 30; and a protruding part 80 on the cover member 24 for dividing the terminal pins 30 from one another, the protruding part 80 extending in the direction of the terminal pin base board part 42 and being in contact with the varnish 70 at the top edge.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a resolver.

  The resolver is generally disposed in the case of the rotating electrical machine in order to detect the rotation angle of the rotor of the rotating electrical machine. As a resolver, as described in Patent Document 1, a rotor fixed coaxially to a shaft of a rotating electrical machine, a stator core having a plurality of salient poles, a stator coil wound around a plurality of salient poles, There are some which connect a stator coil to a lead wire, and have a plurality of terminal pins arranged at intervals and a terminal pin base portion into which a plurality of terminal pins are inserted.

JP2013-51825A

  The casing of the rotating electrical machine is filled with cooling oil for cooling the rotating electrical machine. Therefore, when the resolver is disposed in the case, the cooling oil comes into contact with the resolver, the adjacent terminal pins are electrically connected via moisture and foreign matter in the cooling oil, and the anode terminal pin becomes a metal. There is a risk that electrolytic corrosion that elutes will occur.

  An object of the present invention is to provide a resolver in which terminal pins are unlikely to be connected via moisture and foreign matter in cooling oil, and electrolytic corrosion is unlikely to occur.

  A resolver according to the present invention includes an annular stator core having a plurality of salient poles, a stator coil wound around the plurality of salient poles, a rotor disposed on a radially inner side of the stator core, and the stator coil. A terminal pin base portion into which a plurality of terminal pins connected to the lead wires and spaced apart from each other are inserted, a cover member covering the plurality of terminal pins, and a space around each terminal pin are filled. The cover member is provided with a protruding portion that partitions the terminal pins and extends toward the terminal pin base portion, and a tip of the protruding portion is in contact with the varnish.

  According to the resolver according to the present invention, the protruding portion extends from the cover member to the terminal pin base portion side to partition the terminal pins, and the tip of the protruding portion contacts the varnish provided around the terminal pin. To do. Therefore, the adjacent terminal pins are partitioned from the cover member to the varnish without a gap by the protruding portion, and the terminal pins can be separated by the protruding portion. Therefore, even if a certain terminal pin comes into contact with the cooling oil, moisture or foreign matter in the cooling oil that comes into contact with the terminal pin is blocked by the protruding portion, and does not reach the terminal pin adjacent to the terminal pin. The occurrence of electrolytic corrosion can be suppressed.

It is a perspective view of a resolver concerning one embodiment of the present invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a schematic cross section which shows a mode that the terminal pin which adjoins in the resolver of a reference example is connected through cooling oil. It is a schematic cross section corresponding to Drawing 5 in the resolver of the above-mentioned embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, when a plurality of embodiments and modifications are included, it is assumed from the beginning that a new embodiment is constructed by appropriately combining these characteristic portions.

  FIG. 1 is a perspective view of a resolver 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  Referring to FIG. 1, resolver 1 is disposed in a case (not shown) of a rotating electrical machine. The resolver 1 includes an annular stator 10 fixed to a rotating electrical machine case and a rotor (not shown) fixed to a rotating electrical machine shaft (rotating shaft). The stator 10 includes a stator core 11 and a stator coil 12, and the stator core 11 is configured by stacking, for example, electromagnetic steel plates in the axial direction of a shaft of a rotating electrical machine. The stator core 11 has an annular yoke 13 and a plurality of salient poles (teeth) 14. The plurality of salient poles 14 are arranged at intervals in the circumferential direction of the yoke 13, and each salient pole 14 projects radially inward from the inner circumference side of the yoke 13.

  The stator coil 12 is wound around a plurality of salient poles 14 and attached. The stator coil 12 includes three types of coils including an excitation coil and two detection coils. For example, the two detection coils are mounted on salient poles 14 arranged at an interval of 90 ° in electrical angle of the rotating electrical machine. When an alternating current is applied to the excitation coil, current is induced in the two detection coils.

  Insulators 17 and 18 are disposed above and below the stator core 11 in the axial direction. The insulators 17 and 18 are configured by, for example, a molding method (injection molding method) using a resin material having electrical insulation, and electrical insulation between the windings constituting the stator coil 12 and the stator core 11 and peripheral members. It is provided to ensure.

  Although the structure of the rotor of the resolver 1 (hereinafter, the rotor refers to the rotor of the resolver unless otherwise stated) is not described in detail, the rotor is formed by laminating, for example, electromagnetic steel plates in the axial direction of the shaft of the rotating electrical machine. Configured. The rotor is fixed to the shaft of the rotating electrical machine, and is disposed radially inward of the annular stator core 11 and spaced apart from the stator core 11 in the radial direction. The rotor has, for example, an elliptical plate shape, and the center of the ellipse is located on the central axis of the shaft of the rotating electrical machine.

  When the rotor rotates with the rotation of the shaft of the rotating electrical machine, the gap between the outer peripheral surface of the elliptical rotor and the tip of the salient pole of the stator core 11 changes periodically, resulting in the current induced in the detection coil. Changes periodically. From the change in the current flowing through the detection coil, the rotational position of the rotor relative to the stator 10 is calculated. Since the stator 10 is fixed to the rotating electrical machine case and the rotor rotates integrally with the rotating electrical machine shaft, the rotational position of the rotating electrical machine shaft relative to the rotating electrical machine case is detected. The shape of the rotor is not limited to the above-described ellipse, and may be any shape as long as the gap between the outer circumferential surface and the tip of the salient pole of the stator core periodically changes as the rotor rotates. For example, the shape of the rotor can be a disc shape whose center is deviated from the center of rotation.

  The resolver 1 further includes a connector portion 20 at a part of the peripheral portion of the stator 10. The connector part 20 is provided in order to electrically connect the winding of the stator coil 12 to an external circuit. The connector unit 20 is made of, for example, resin and includes a cover member 24. As shown in FIG. 2, the cover member 24 includes a terminal pin cover portion 21 that covers the terminal pins 30 and a connector terminal cover portion 22 that covers the connector terminals 40. Each of the terminal pin cover portion 21 and the connector terminal cover portion 22 has wall portions 37 and 38 extending in the axial direction of the stator core 11 (hereinafter referred to as Z direction), and the wall portion 37 of the terminal pin cover portion 21 is The cover portions 21 and 22 are integrated by fixing to the wall portion 38 of the connector terminal cover portion 22 with a fixing means such as an adhesive.

  In the example shown in FIG. 2, the connector terminal cover part 22 includes a terminal pin base part 42. The terminal pin base portion 42 faces the ceiling portion 26 that covers the terminal pins 30 in the terminal pin cover portion 21 in the Z direction. The terminal pin 30 is inserted into the terminal pin base portion 42. In this example, the connector terminal cover part 22 is integrally formed with the insulator 17, and the terminal pins 30 and the connector terminals 40 are integrally formed with the connector terminal cover part 22 by insert molding, for example. That is, the terminal pin 30 is formed by disposing a metal member constituting the terminal pin 30 and the connector terminal 40 as the insert material inside the mold for obtaining the insulator 17, and performing injection molding using resin in that state. And the connector terminal 40 is embedded in the insulator 17 and integrated.

  3 is a cross-sectional view taken along line BB in FIG. 1, and FIG. 4 is a cross-sectional view taken along line CC in FIG. As shown in FIG. 3, the resolver 1 has six terminal pins 30, and the six terminal pins 30 are for the exciting coil, two for the first detection coil, and two for the second detection. Assigned for coils. The end of the lead wire of the exciting coil, the end of the lead wire of the first detection coil, and the end of the lead wire of the second detection coil in the stator coil 12 (see FIG. 1) are welded or soldered to the terminal pin 30. And is electrically connected to the terminal pin 30. The terminal pin 30 has a role of electrically connecting the stator coil 12 to a lead wire of an external device. Although not shown, the resolver 1 also has six connector terminals 40, and each terminal pin 30 is electrically connected to the corresponding connector terminal 40 (see FIG. 2) via a conductor 48. In the connector terminal cover, a mating terminal at the tip of a lead wire from an external device (not shown) is mounted, and the mating terminal is electrically connected to the connector terminal 40 by such mounting. The excitation current is supplied, the first detection coil signal is output, and the second detection coil signal is output through the counterpart terminal.

  As shown in FIG. 3, a varnish 70 is applied to the upper surface side of the terminal pin base portion 42 (the ceiling portion 26 side of the terminal pin cover portion 21). The varnish 70 may be composed of any known material in which a resin or the like is dissolved in a solvent, but can be suitably composed of, for example, an epoxy resin or silicone. The varnish 70 is filled around the portion of each terminal pin 30 on the terminal pin base portion 42 side. As shown in FIG. 4, the varnish 70 is disposed so as to wrap around the lead wire 55 from the stator coil 12, and a portion of the lead wire 55 located on the terminal pin 30 side is fixed to the connector portion 20. The varnish 70 is provided to prevent the lead wire 55 from being disconnected due to vibration of the rotating electrical machine.

  As shown in FIG. 3, the terminal pin cover portion 21 of the cover member 24 is provided with a plurality of protrusions 80. The protruding portion 80 partitions the adjacent terminal pins 30 and extends from the ceiling portion 26 to the terminal pin base portion 42 side. One protrusion 80 is disposed between the adjacent terminal pins 30.

  More specifically, the protruding portion 80 protrudes in the Z direction from the ceiling portion 26 of the terminal pin cover portion 21 toward the varnish 70, and the tip of the protruding portion 80 contacts the varnish 70. Moreover, in FIG. 4, the protrusion part 80 has a substantially rectangular shape. Further, when the Y direction is a direction that is included in a plane that bisects the connector portion 20 and is perpendicular to the Z direction, the existence range of the terminal pin 30 in the Y direction is the existence range of the protrusion 80 in the Y direction. include. Further, the terminal pins 30 are adjacent to each other, and when viewed from the X direction orthogonal to both the Y direction and the Z direction, all the portions of the terminal pins 30 that protrude from the varnish 70 overlap the protruding portions 80. As a result, the adjacent terminal pins 30 are partitioned by the protrusions 80 from the ceiling 26 of the terminal pin cover portion 21 to the varnish 70 without a gap, and the terminal pins 30 are completely separated by the protrusions 80.

  As shown in FIG. 3, the resolver 1 further includes a plurality of pin base side protrusions 81. Each pin base side protrusion 81 is configured integrally with the terminal pin base 42 and protrudes from the terminal pin base 42 toward the ceiling 26 in the Z direction. The pin base side protrusions 81 are arranged one by one between the protrusions 80 and the terminal pins 30 in the X direction, penetrate the varnish 70 and protrude from the varnish 70 in the Z direction.

  As shown in FIGS. 3 and 4, the pin base-side protruding portion 81 has an elongated plate shape in which the X direction is the thickness direction and the Y direction is the longitudinal direction. As shown in FIG. 4, when viewed from the X direction, the pin base side protruding portion 81 has a portion that overlaps the protruding portion 80. The existence range of the terminal pin 30 in the Y direction is included in the existence range of the pin base side protruding portion 81 in the Y direction. As will be described in detail later, the pin base side protruding portion 81 has a function of suppressing electrolytic corrosion. Further, the pin base side protruding portion 81 functions as a guide wall that guides the lead wire 55 of the stator coil 12 (see FIG. 1), and also functions as a partition wall that equalizes the height (depth) of the varnish 70. To do.

  FIG. 5 is a schematic cross-sectional view showing a state in which adjacent terminal pins 130 are connected via moisture in the cooling oil and foreign matter 188 in the resolver 101 of the reference example, and FIG. 6 is a diagram of the resolver 1 of the present embodiment. It is a schematic cross section corresponding to FIG.

  In the reference example shown in FIG. 5, the protruding portion 80 described above does not exist, and the portions protruding from the varnish 170 in the two terminal pins 130 adjacent to each other in the X direction overlap substantially when viewed from the X direction. That is, there are no members or parts that block the portions protruding from the varnish 170 in the two terminal pins 130 adjacent in the X direction. Therefore, as shown in FIG. 5, the two adjacent terminal pins 130 are easily connected by moisture in the cooling oil and the foreign matter 188, and there is a possibility that electric corrosion may occur due to the connection. In particular, in a terminal to which a voltage of about 25 V is applied, electrolytic corrosion tends to occur depending on the characteristics of the cooling oil.

  On the other hand, in this embodiment, as shown in FIG. 6, the protruding portion 80 protrudes in the Z direction from the ceiling portion 26 of the terminal pin cover portion 21 toward the varnish 70 and contacts the varnish 70. The space is completely separated by the protrusion 80. Therefore, even if moisture or foreign matter 88 in the cooling oil extends from a certain terminal pin 30, the moisture or foreign matter 88 is blocked by the protrusion 80 and the varnish 70.

  According to the above embodiment, even if a certain terminal pin 30 comes into contact with the cooling oil, moisture or foreign matter in the cooling oil that comes into contact with the terminal pin 30 is blocked by the protruding portion 80 and is adjacent to the terminal pin 30. The terminal pin 30 is not reached. Therefore, the occurrence of electrolytic corrosion can be suppressed.

  Further, the pin base side protruding portion 81 extends from the terminal pin base portion 42 and protrudes in the Z direction from the varnish 70 toward the ceiling portion 26, and in the Y direction so as to block between the adjacent terminal pins 30. Extend. Therefore, the pin base side protruding portion 81 can prevent moisture and foreign matter 88 from bridging between the adjacent terminal pins 30 on the terminal pin base portion 42 side in the Z direction. Therefore, the occurrence of electrolytic corrosion can be greatly suppressed.

  Further, since the pin base side protruding portion 81 protrudes in the Z direction from the varnish 70 toward the ceiling portion 26 and extends in the Y direction so as to block between the adjacent terminal pins 30, The lead wire 55 can be supported and guided by the side surface of the pin base side protruding portion 81. As a result, the lead wire 55 from the stator coil 12 is easily disposed at a desired location, the disconnection of the lead wire 55 can be suppressed, and the resolver quality can be improved.

  Furthermore, the local partition with which the varnish 70 is filled can be comprised by the adjacent pin base side protrusion part 81. FIG. Therefore, it becomes easy to control the local filling amount of the varnish 70, the depth of the varnish 70 can be easily and uniformly controlled, and productivity and quality are improved.

  The present invention is not limited to the above-described embodiment and its modifications, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent ranges.

  For example, in the above embodiment, the protruding portion 80 protruding from the cover member 24 toward the terminal pin base portion 42 has a substantially rectangular shape, and the existence range of the terminal pin 30 in the Y direction is Y of the protruding portion 80. The case where it is included in the direction existence range has been described. However, the protruding portion that protrudes from the cover member toward the terminal pin base portion may have any shape other than a rectangle. Further, the existence range of the terminal pin in the Y direction is not necessarily included in the existence range of the protruding portion in the Y direction, and at least a part of the existence range of the terminal pin in the Y direction is present in the Y direction of the protruding portion. As long as they overlap.

  Further, a protruding portion 80 that protrudes from the cover member 24 toward the terminal pin base portion 42 is disposed between the adjacent terminal pins 30. However, the protruding portion that protrudes from the cover member toward the terminal pin base portion only needs to be disposed between at least one adjacent terminal pin, and there is an interval between adjacent terminal pins where the protruding portion is not disposed. Also good.

  Further, the pin base side protruding portion 81 extends from the terminal pin base portion 42 and protrudes in the Z direction from the varnish 70 to the ceiling portion 26 side, and blocks between the adjacent terminal pins 30 in the Y direction. Extended to. However, the pin base side protruding portion may not be disposed between the adjacent terminal pins, and there may be an interval between adjacent terminal pins where the pin base side protruding portion is not disposed. Or the pin base side protrusion part does not need to be provided at all. In this case, it is preferable that the space between the six terminal pins arranged at intervals is filled with varnish.

  DESCRIPTION OF SYMBOLS 11 Stator core, 12 Stator coil, 14 Salient pole, 24 Cover member, 30 Terminal pin, 42 Terminal pin base part, 70 Varnish, 80 Protrusion part.

Claims (1)

An annular stator core having a plurality of salient poles;
A stator coil wound around the plurality of salient poles;
A rotor disposed radially inward of the stator core;
A terminal pin base portion into which a plurality of terminal pins that are electrically connected to the lead wires and spaced apart from each other are inserted;
A cover member covering the plurality of terminal pins;
A varnish filled around each terminal pin,
The cover member is provided with a protruding portion that partitions between the terminal pins and extends toward the terminal pin base portion,
A resolver in which a tip of the protrusion is in contact with the varnish.

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