JP5728704B2 - Resolver mounting structure - Google Patents

Description

  The present invention relates to a resolver mounting structure having a resolver stator disposed outside a case housing an electric motor, and a resolver rotor fixed to a rotating shaft of the electric motor protruding outside the case.

  Conventionally, as this type of resolver mounting structure, a resolver rotor is fixed to a rotating shaft of a motor projecting to the outside of a housing that houses the motor, and can be rotated around the rotating shaft of the motor with respect to the housing. One that fixes a resolver stator inside a bracket coupled to the housing has been proposed (see, for example, Patent Document 1). In this resolver mounting structure, the position of the resolver stator in the rotational direction relative to the resolver rotor, that is, the zero point adjustment can be easily performed by rotating the resolver stator together with the bracket with respect to the housing. The bracket is firmly coupled to the housing after the zero point adjustment of the resolver stator.

JP 2007-6570 A

  In order to accurately detect the position of the rotating shaft of the motor by the resolver as described above, the resolver rotor and the resolver stator are concentric with the rotating shaft of the motor in addition to accurately adjusting the zero point of the resolver stator. It is necessary to align each member with high accuracy so that they are arranged. However, in the above conventional resolver mounting structure, the resolver stator is fixed to a bracket coupled to a housing that houses the motor. Therefore, unless the mounting accuracy of a plurality of members is ensured, the resolver stator is adjusted accurately. There is a risk that you may not feel right.

  The main object of the resolver mounting structure of the present invention is to fix the resolver stator to the case while enabling easy and accurate alignment and zero point adjustment.

  The resolver mounting structure of the present invention adopts the following means in order to achieve the main object described above.

  The resolver mounting structure of the present invention is fixed to a resolver stator that is disposed outside a case that houses an electric motor and is fixed to the case by a fixing member, and a rotating shaft of the electric motor that protrudes outside the case. A resolver mounting structure having a resolver rotor, wherein the case is formed with an alignment portion that supports the outer periphery of the resolver stator and can align the resolver stator, and the fixing member is The resolver stator is engaged with the resolver stator so as to be integrally rotatable about the rotation axis, is rotatable about the rotation axis with respect to the case, and is attached to the case via a fastening member.

  In the resolver mounting structure of the present invention, the aligning portion that supports the outer periphery of the resolver stator and can align the resolver stator is provided in the case that houses the motor. The fixing member for fixing the resolver stator to the case is engaged with the resolver stator so as to be integrally rotatable about the rotation axis of the electric motor and is rotatable about the rotation axis with respect to the case. Can be attached to the case. When fixing the resolver stator to the case, first, the resolver stator is fitted into the aligning portion of the case. Thereby, the resolver stator can be easily and accurately aligned. Next, the fixing member is engaged with the resolver stator supported by the aligning portion of the case, and the fixing member is connected to the case via the fastening member, and the fixing member is rotated with respect to the case, so that the zero of the resolver stator is obtained. Perform point adjustment. Thereby, the zero point adjustment of the resolver stator can be easily and accurately performed. And if a fixing member is firmly fastened with respect to a case with a fastening member, a resolver stator can be firmly fixed with respect to a case. Therefore, according to the resolver mounting structure of the present invention, it is possible to fix the resolver stator to the case while making alignment and zero point adjustment easier and more accurate.

It is a principal part expanded sectional view of the motor unit 10 to which the attachment structure of the resolver 20 which concerns on an Example is applied. It is sectional drawing along the II-II line in FIG. 3 is a perspective view showing a stator core 220 of a resolver stator 22. FIG. 3 is a perspective view showing a fixing member 30 that fixes a resolver stator 22 to a case 12. FIG. 4 is an enlarged partial cross-sectional view showing a main part of the motor unit 10. FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is an enlarged cross-sectional view of a main part of a motor unit 10 to which a resolver 20 mounting structure according to the present invention is applied. The motor unit 10 is mounted on, for example, a vehicle and outputs traveling power, or recovers kinetic energy of the vehicle to generate electric power. As shown in the figure, the motor unit 10 of the embodiment includes a motor 11, a case 12 that houses the motor 11, a resolver 20 as a rotational position detection sensor that detects the rotational position of the motor 11, and the resolver 20 in the case 12. And a bottomed cylindrical fixing member 30 for fixing. The resolver 20 of the embodiment has a resolver rotor 21 that is fixed to the rotation shaft 13 of the motor 11 and rotates integrally with the rotation shaft 13, and a hollow portion in which the resolver rotor 21 is accommodated in the center. The ring-shaped resolver stator 22 is arranged outside.

  The motor 11 is a well-known synchronous generator motor including a rotor 110 to which the rotation shaft 13 is fixed and an annular stator 111 having a hollow portion in which the rotor 110 is accommodated in the center. The rotor 110 is obtained by embedding a plurality of permanent magnets in a rotor core formed by laminating a plurality of electromagnetic steel plates. The stator 111 is formed by winding a coil to which an alternating current is applied from a power supply source (not shown) disposed outside the case 12 on a stator core formed by laminating a plurality of substantially annular electromagnetic steel plates. The rotating shaft 13 fixed to the rotor 110 of the motor 11 is disposed so that one end protrudes from the opening 120 formed in the case 12 to the outside of the case 12, and inside the opening 120 (left side in FIG. 1). It is rotatably supported by the case 12 via the arranged bearing. A seal member 50 is provided between the opening 120 of the case 12 and the outer peripheral surface of the rotary shaft 13 to prevent the coolant supplied into the case 12 from cooling outside the case to cool the motor 11. Be placed. When a current is applied to the coil of the stator 111 of the motor 11 configured as described above, a rotating magnetic field is generated, and the permanent magnet of the rotor 110 is attracted to the rotating magnetic field, whereby the rotor 110 and the rotating shaft 13 rotate. To do. Hereinafter, the axial direction of the rotating shaft 13 of the motor 11 is simply referred to as “axial direction”, and the radial direction of the rotating shaft 13 is simply referred to as “radial direction”. The rotating shaft 13 is formed with a step portion 13 a that contacts the end face of the resolver rotor 21.

  As shown in FIG. 1, the case 12 has a step portion 12 a that abuts the end surface of the resolver stator 22 on the outer wall including the opening 120. The stepped portion 12a is formed in the case 12 so that the resolver stator 22 that is in contact with the stepped portion 12a and the resolver rotor 21 that is in contact with the stepped portion 13a of the rotating shaft 13 overlap each other when viewed from the radial direction. Thereby, the axial direction positions of the resolver rotor 21 and the resolver stator 22 can be easily aligned. In addition, a plurality (four in the embodiment) of first aligning portions 12 b protruding toward the outside of the case 12 are formed on the step portion 12 a of the case 12 at intervals in the circumferential direction. In the embodiment, the length of the first alignment portion 12b in the protruding direction is set to be shorter than the thickness of the resolver stator 22 (stator core 220) (see FIG. 5). The inner circumferential surface of each first alignment portion 12b is centered on the axis of the rotating shaft 13 and has a radius of curvature that is substantially the same (slightly larger) as the outer circumferential surface of the resolver stator 22 (stator core 220). The outer peripheral surface of each first aligning portion 12b is centered on the axis of the rotating shaft 13 and substantially the same as the inner peripheral surface of the open end (opening 300) of the fixed member 30. It is formed in a convex curved surface shape having the same (slightly smaller) radius of curvature. Further, the step 12a of the case 12 is formed with a plurality of (two in the embodiment) second aligning portions 12c projecting toward the outside of the case 12 on the radially outer side than the first aligning portion 12b. Has been. The inner peripheral surface of each second aligning portion 12c is formed in a concave curved surface centered on the axis of the rotary shaft 13 and having a radius of curvature that is substantially the same (slightly larger) as the outer peripheral surface of the fixing member 30. ing.

  The resolver rotor 21 constituting the resolver 20 is obtained by embedding a plurality of permanent magnets in a rotor core formed by laminating a plurality of electromagnetic steel plates formed in an elliptical ring shape. The resolver rotor 21 is inserted and fixed to the rotary shaft 13 so that the end surface on the case 12 side is in contact with a step portion 13 a formed on the rotary shaft 13. The resolver stator 22 constituting the resolver 20 includes an excitation coil to which an alternating current having a constant frequency is applied as an excitation signal from an oscillation circuit (not shown) to a stator core 220 formed by laminating a plurality of annular electromagnetic steel plates, Two output coils that are arranged at intervals of 90 degrees and connected to an electronic control unit (both not shown) via a converter or the like are wound. The output coil transmits a signal corresponding to a change in the gap between the resolver rotor 21 and the resolver stator 22 generated by the rotation of the elliptical resolver rotor 21 together with the rotating shaft 13 of the motor 11 to the electronic control unit. Yes, the telegraph control unit can calculate the rotational position of the rotating shaft 13 of the motor 11 based on the signal. Further, as shown in FIGS. 2 and 3, a plurality of (four in the embodiment) concave portions 220 a are formed on the outer periphery of the stator core 220 of the resolver stator 22.

  As shown in FIGS. 1 and 4, the fixing member 30 has an opening 300 having a circular cross section on the case 12 side, and has a diameter smaller than the opening 300 and a circular cross section on the bottom side of the opening 300. A step portion 301 that has an internal space and extends in the radial direction is formed between the opening 300 and the internal space. In the embodiment, the length from the end surface on the opening side of the fixing member 30 to the stepped portion 301 is set shorter than the thickness of the stator core 220 of the resolver stator 22 (see FIG. 5). Further, a plurality of (four in the embodiment) protruding radially inwardly engageable with a plurality of recesses 220a formed on the outer peripheral surface of the stator core 220 of the resolver stator 22 on the inner peripheral surface of the opening 300. A convex portion 300a is formed. A plurality of (in the embodiment, two) projecting portions 302 projecting outward in the radial direction are formed on the outer peripheral surface of the fixing member 30. Each projecting portion 302 has an outer periphery of the fixing member 30. A long hole 302 a is formed so as to extend along the surface and to face a fastening hole (screw hole) (not shown) formed in the case 12. A bolt 40 (see FIG. 2) is inserted into the elongated hole 302a of each overhanging portion 302, and the fixing member 30 is fastened and fixed to the case 12 by screwing the bolt 40 into the fastening hole of the case 12. Can do.

  Next, a procedure for fixing the resolver stator 22 to the case 12 of the motor unit 10 configured as described above will be described.

  When the resolver stator 22 is fixed to the case 12, the resolver rotor 21 is fixed to the rotating shaft 13 so that one end surface thereof is in contact with the step portion 13 a, and the end surface on the case 12 side of the resolver stator 22 is fixed to the case 12. The plurality of first aligning portions 12b are fitted so as to contact the stepped portion 12a. Thereby, the outer peripheral surface of the resolver stator 22 is supported by the inner peripheral surfaces of the plurality of first aligning portions 12b, and the resolver stator 22 is aligned with the rotating shaft 13 and fixed to the rotating shaft 13. It is arranged coaxially with the resolver rotor 21. Therefore, in the motor unit 10, the resolver stator 22 can be easily and accurately aligned.

  Next, the first alignment of the case 12 is performed so that the convex portion 300 a formed on the inner peripheral surface of the opening 300 is engaged with the concave portion 220 a formed on the outer periphery of the stator core 220 of the resolver stator 22. It fits between the part 12b and the second aligning part 12c. Thus, the inner peripheral surface of the opening 300 is supported by the outer peripheral surface of the first aligning portion 12b, the outer peripheral surface of the fixing member is supported by the inner peripheral surface of the second aligning portion 12c, and the fixing member 30 is These are aligned concentrically with the rotary shaft 13 and are arranged coaxially with the resolver rotor 21 and the resolver stator 22. Further, the bolts 40 are inserted into the long holes 302 a of the protruding portions 302 of the fixing member 30, and the bolts 40 are loosely screwed into fastening holes (not shown) of the case 12. Then, after the fixing member 30 is connected to the case 12 via the bolt 40 in this way, the fixing member 30 is rotated with respect to the case 12 to adjust the zero point of the resolver stator 22.

  Here, since the elongated holes 302a formed in each overhanging portion 302 extend in the direction along the outer peripheral surface of the fixing member 30, that is, in the rotation direction of the rotating shaft 13, the fixing member 30, the case 12, Can be rotated around the rotary shaft 13 with respect to the case 12. And since the convex part 300a of the fixing member 30 engages with the concave part 220a of the stator core 220 of the resolver stator 22, if the fixing member 30 is rotated with respect to the case 12 outside the case 12, the resolver stator 22 is moved. It can be rotated integrally with the fixing member 30. Thereby, since the rotational position of the resolver stator 22 can be changed only by rotating the fixing member 30 outside the case 12, the zero point adjustment of the resolver stator 22 can be performed easily and accurately.

  After the zero point adjustment of the resolver stator 22 is performed, the fixing members 30 are firmly fastened to the case 12 by the bolts 40 by screwing the bolts 40 into the fastening holes of the case 12. Thereby, the length of the first alignment portion 12b in the protruding direction is set to be shorter than the thickness of the resolver stator 22 (stator core 220), and the length from the end surface on the opening side of the fixing member 30 to the step portion 301 is set. Since the thickness is set shorter than the thickness of the resolver stator 22 (stator core 220), the end surface of the resolver stator 22 is pressed by the step portion 301 of the fixing member 30. Accordingly, the resolver stator 22 is sandwiched between the step 12a of the case 12 and the step 301 of the fixing member 30 and is firmly fixed to the case 12 (see FIG. 5).

  As described above, in the motor unit 10 to which the mounting structure of the resolver 20 according to the embodiment is applied, the first aligning portion 12b that supports the outer periphery of the resolver stator 22 and aligns the resolver stator 22 is the motor 11. Is provided in the case 12. Further, the fixing member 30 for fixing the resolver stator 22 to the case 12 is engaged with the resolver stator 22 and the rotation shaft 13 of the motor 11 so as to be integrally rotatable, and around the rotation shaft 13 with respect to the case 12. It can rotate and is attached to the case 12 via a bolt 40 as a fastening member. As a result, it is possible to fix the resolver stator 22 to the case 12 while making alignment and zero point adjustment easier and more accurate. When the resolver 20 is arranged inside the case 12, generally, a jig insertion hole for inserting a jig for enabling the zero point adjustment of the resolver stator 22 or the resolver stator 22 itself is fixed to the case 12. However, according to the mounting structure of the resolver 20 of the embodiment, it is not necessary to form such jig insertion holes and bolt holes in the case 12. Therefore, it is possible to prevent the coolant in the case 12 from leaking out of the case through the jig insertion hole or the bolt hole. Furthermore, by disposing the resolver 20 outside the case 12, it is possible to prevent foreign matters or the like mixed in the cooling liquid in the case 12 from adhering to the resolver 20, and therefore, the resolver 20 to be disposed in the case 12. Therefore, the number of parts of the apparatus can be reduced.

  Further, in the motor unit 10 of the embodiment, the concave portion 220a is formed on the outer periphery of the stator core 220 of the resolver stator 22, and the convex portion 300a that can be engaged with the concave portion 220a is formed on the inner peripheral surface of the opening portion 300 of the fixing member 30. Although formed, a convex portion may be formed on the outer periphery of the stator core 220, and a concave portion engageable with the convex portion may be formed on the inner peripheral surface of the opening 300 of the fixing member 30. And the said recessed part and convex part should just be formed in the resolver stator 22 and the fixing member 30 at least 1 each, Furthermore, the structure for engaging the resolver stator 22 and the fixing member 30 is as above-mentioned. Any configuration may be used as long as the resolver stator and the fixing member 30 can be integrally rotated around the rotation shaft 13. Each overhanging portion 302 of the fixing member 30 is formed with a notch having a guide surface extending in the direction along the outer peripheral surface of the fixing member 30 (the rotation direction of the rotary shaft 13) instead of the long hole 302a. May be. Furthermore, if the fixing member 30 is formed in a bottomed cylindrical shape, the resolver stator 22 disposed outside the case 12 can be protected, but the fixing member 30 is formed in a cylindrical shape having no bottom. May be.

  Here, the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the resolver stator 22 is disposed outside the case 12 that houses the motor 11 and is fixed to the case 12 by the fixing member 30, and is fixed to the rotating shaft 13 of the motor 11 that protrudes outside the case 12. The resolver 20 having the resolver rotor 21 corresponds to a “resolver”.

  However, the correspondence between the main elements in the above embodiment and the main elements of the invention described in the column of means for solving the problem is described in the column of means for the embodiment to solve the problem. Since it is an example for concretely explaining the form for carrying out the invention, the element of the invention indicated in the column of the means for solving a subject is not limited. That is, the above embodiment is merely a specific example of the invention described in the column of means for solving the problem, and the interpretation of the invention described in the column of means for solving the problem is that column. This should be done based on the description.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention. .

  The present invention can be used in, for example, a manufacturing industry of a resolver and an electric motor including the resolver.

  DESCRIPTION OF SYMBOLS 10 Motor unit, 11 Motor, 110 Rotor, 111 Stator, 12 Case, 12a Step part, 12b 1st aligning part, 12c 2nd aligning part, 120 Opening part, 13 Rotating shaft, 13a Step part, 20 Resolver, 21 Resolver rotor, 22 resolver stator, 220 stator core, 220a concave portion, 30 fixing member, 300 opening, 300a convex portion, 301 step portion, 302 overhang portion, 302a long hole, 40 bolt, 50 seal member.

Claims (1)

A resolver mounting structure including a resolver stator that is disposed outside a case that houses an electric motor and is fixed to the case by a fixing member, and a resolver rotor that is fixed to a rotating shaft of the electric motor that protrudes outside the case. Because
The case is formed with a step portion that comes into contact with one end face of the resolver stator, and a centering portion that protrudes from the step portion and supports the outer periphery of the resolver stator to align the resolver stator. And
The fixing member is formed with an opening having an inner peripheral surface supported by the outer peripheral surface of the aligning portion, and a step portion that comes into contact with the other end surface of the resolver stator,
The fixing member engages with the resolver stator so as to be integrally rotatable around the rotation axis and is rotatable around the rotation axis with respect to the case, and is attached to the case via a fastening member ,
The resolver mounting structure , wherein the length of the alignment portion in the protruding direction and the length from the opening end surface of the fixing member to the stepped portion of the fixing member are shorter than the thickness of the resolver stator. .

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