JP2015050801A - Driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device in which degrading of measurement accuracy of a resolver by decreasing magnetic leakage from a rotor hub of a motor to a resolver rotor.SOLUTION: A driving device 1 includes a motor 4 having a rotor hub 40 for supporting an inner circumference of a motor rotor 41; a resolver rotor 51 whose outer circumference is supported by the inner circumference of the rotor hub 40 and which is fixed and integrally rotates with the rotor hub 40; and a resolver 5 which detects a rotational position of the motor rotor 41 by detecting a rotational position of the resolver rotor 51. An isolation part 8 is formed on at least a part of a gap between the outer circumference of the resolver rotor 51 and the inner circumference of the rotor hub 40 so that the resolver rotor 51 and the rotor hub 40 are magnetically isolated.

Description

  The present invention relates to a drive device including a rotating electrical machine and a resolver mounted on, for example, a hybrid vehicle or an electric vehicle, and more particularly to a drive device that reduces leakage magnetic flux from the rotating electrical machine to the resolver.

  In recent years, various vehicles equipped with a motor / generator (hereinafter also referred to as “motor”) such as a hybrid vehicle and an electric vehicle have been proposed in order to improve vehicle fuel efficiency and environmental performance. A vehicle equipped with this type of motor is generally provided with a resolver that is a rotational position sensor using magnetism in order to detect the rotational speed of the motor. The resolver includes a resolver stator and a resolver rotor that can rotate with respect to the resolver stator, and the resolver stator includes an excitation coil and a detection coil. A magnetic flux is generated from the exciting coil, the magnetic flux is detected by the detection coil via the resolver rotor, and the rotation of the resolver rotor is detected by the change of the magnetic flux.

  As the resolver, an inner rotor type in which the rotor rotates on the inner peripheral side of the stator is conventionally used, and in recent years, an outer rotor type in which the rotor rotates on the outer peripheral side of the stator has been developed. In an outer rotor type resolver, a resolver rotor is assembled on the inner peripheral side of a rotor hub that rotatably supports the motor rotor from the inner peripheral side (see Patent Document 1). When fixing the resolver rotor to the rotor hub, for example, the outer peripheral portion of the resolver rotor is fitted into the inner peripheral portion of the rotor hub, and crimped in the axial direction via a retainer. At that time, a key is used to define the circumferential positional relationship between the permanent magnet embedded in the motor rotor and the resolver rotor. According to the outer rotor type resolver, the axial dimension can be reduced as compared with the inner rotor type resolver, so that the unit can be downsized.

JP 2001-113970 A

  However, in the drive device of Patent Document 1, since the outer peripheral portion of the resolver rotor is fitted in the inner peripheral portion of the rotor hub, the magnetic flux of the permanent magnet embedded in the motor rotor passes through the rotor hub, which is a magnetic body, to the resolver rotor. There was a possibility of leakage. Further, the magnetic flux leaking from the motor stator may leak from the rotor hub to the resolver rotor. As a result, when the magnetic flux generated from the exciting coil of the resolver stator passes through the resolver rotor, it may be hindered by leakage magnetic flux from the motor rotor and motor stator, and the measurement accuracy of the resolver may be reduced. There was a problem that there was.

  Therefore, an object of the present invention is to provide a drive device that can suppress a decrease in the measurement accuracy of a resolver by reducing magnetic flux leakage from a rotor hub of a motor to a resolver rotor.

The drive device (1) according to the present invention (see, for example, FIGS. 1 to 5) includes a rotating electrical machine (4) having a rotor hub (40) that supports an inner peripheral portion of a first rotor (41);
An outer peripheral portion is supported by the inner peripheral portion of the rotor hub (40), and has a second rotor (51) fixed so as to rotate integrally with the rotor hub (40), and the second rotor (51) And a resolver (5) capable of detecting the rotational position of the first rotor (41) by detecting the rotational position of the drive device (1),
The second rotor (51) and the rotor hub (40) are magnetically insulated at least partially between the outer peripheral portion of the second rotor (51) and the inner peripheral portion of the rotor hub (40). An insulating part (8) is provided.

  Further, the drive device (1) according to the present invention (see, for example, FIGS. 1 to 4) is provided on either the outer peripheral portion of the second rotor (51) or the inner peripheral portion of the rotor hub (40). A plurality of protrusions (51b, 45f) for projecting toward the other and contacting the rotor hub (40) and positioning the second rotor (51) in the radial direction are provided.

  In the driving device (1) according to the present invention (see, for example, FIGS. 1 to 3), the plurality of protrusions (51b) are formed on the outer peripheral portion of the second rotor (51). And

  In the driving device (1) according to the present invention (see, for example, FIG. 3), the plurality of protrusions (51b, 45f) are a plurality of permanent magnets (43) embedded in the first rotor (41). It arrange | positions in the position facing the same pole of these.

Further, the driving device (1) according to the present invention (see, for example, FIGS. 1 and 2) is a fixed that clamps the second rotor (51) in the axial direction and restricts the axial position with respect to the rotor hub (40). With tools (54, 55),
The fixture (54, 55) is made of a nonmagnetic material.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, the resolver rotor and the rotor hub are magnetically insulated at least at a part between the outer peripheral portion of the second rotor (resolver rotor) of the resolver and the inner peripheral portion of the rotor hub. It has an insulating part. For this reason, the leakage magnetic flux that has entered the rotor hub from the motor rotor and the motor stator is less likely to leak to the resolver rotor, and the inhibition of the magnetic flux generated from the excitation coil of the resolver stator from the leakage magnetic flux when passing through the resolver rotor can be reduced. Therefore, it is possible to suppress a decrease in the measurement accuracy of the resolver.

  According to the second aspect of the present invention, since either one of the outer peripheral portion of the resolver rotor and the inner peripheral portion of the rotor hub is provided with a plurality of positioning projections that protrude and contact toward the other, The resolver rotor can be positioned in the radial direction with respect to the rotor hub.

  According to the third aspect of the present invention, since the plurality of protrusions are formed on the outer peripheral portion of the resolver rotor, for example, the steel plate constituting the resolver rotor can be manufactured easily and at a low cost by a technique such as punching with a press. Can do. Moreover, since it is not necessary to cut out the inner peripheral portion of the rotor hub as in the case where the plurality of protrusions are formed on the inner peripheral portion of the rotor hub, an increase in manufacturing cost can be suppressed.

  According to the fourth aspect of the present invention, the plurality of protrusions are disposed at positions facing the same pole among the plurality of permanent magnets embedded in the first rotor (motor rotor). For this reason, even if the magnetic flux leaks to the resolver rotor through one protrusion facing from one permanent magnet, the other protrusion faces the permanent magnet having the same polarity as the one permanent magnet. Magnetic flux leaking from the other protrusions to the other permanent magnets is not formed via the one protrusion and the resolver rotor facing from the one permanent magnet. Therefore, since the obstruction received from the leakage magnetic flux in the resolver stator can be further reduced, a decrease in the measurement accuracy of the resolver can be suppressed.

  According to the fifth aspect of the present invention, the resolver rotor is made of a nonmagnetic material so as to sandwich the resolver rotor in the axial direction and restrict the axial position with respect to the rotor hub. Even in the direction, it is magnetically insulated from the rotor hub. For this reason, the leakage magnetic flux of the rotor hub is more difficult to leak to the resolver rotor, and the inhibition received from the leakage magnetic flux in the resolver stator can be further reduced, so that a decrease in the measurement accuracy of the resolver can be suppressed.

It is sectional drawing which shows the drive device which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the drive device which concerns on the 1st Embodiment of this invention, (a) is an exploded view, (b) is an expanded sectional view of a resolver rotor. It is a schematic diagram which shows the positional relationship of the protrusion part of the resolver rotor of the drive device which concerns on the 1st Embodiment of this invention, and the permanent magnet of a motor rotor. It is explanatory drawing which shows the drive device which concerns on the 2nd Embodiment of this invention, (a) is an exploded view, (b) is an expanded sectional view of a resolver rotor. It is explanatory drawing which shows the drive device which concerns on the 3rd Embodiment of this invention, (a) is an exploded view, (b) is an expanded sectional view of a resolver rotor, (c) is an enlarged view of the keyway of an insulating ring. It is.

  Hereinafter, the structure of the drive device according to each embodiment of the present invention will be described with reference to FIGS. In addition, the drive device 1 in each embodiment shall be applied to the hybrid vehicle, for example.

[First Embodiment]
As shown in FIG. 1, the drive device 1 is provided on a motor shaft 3 that is rotatably supported with respect to the case 2, a motor (rotary electric machine) 4 provided on the motor shaft 3, and the motor 4. And a resolver 5. The case 2 includes a case main body (not shown) provided on the left side of FIG. 1 and a case cover 20 that closes an opening of the case main body.

  The motor shaft 3 is rotatably supported with respect to the case 2 by a ball bearing 6 whose one end is supported by the case cover 20 and by a ball bearing (not shown) whose other end is supported by the case body. . In the vicinity of the ball bearing 6 on the outer periphery of the motor shaft 3, a welded portion 30 having a diameter increased in a flange shape is formed. A rotor hub 40 described later is joined to the welded portion 30 by welding. .

  The motor 4 is provided on the outer peripheral side of the motor shaft 3. The motor 4 includes a rotor hub 40 fixed to the outer periphery of the motor shaft 3 so as to rotate integrally with the motor shaft 3, a motor rotor (first rotor) 41 whose inner periphery is supported by the rotor hub 40, and the case 2. The motor stator 42 is fixed, and the motor rotor 41 is a so-called IPM motor in which a permanent magnet 43 (see FIG. 3) is embedded.

  The rotor hub 40 includes a flange portion 44 that is joined to the motor shaft 3 and spreads in a flange shape from the motor shaft 3, and a hub portion 45 that is provided integrally on the outer peripheral side of the flange portion 44. The flange portion 44 has a substantially annular shape, and an inner peripheral portion is joined to the welded portion 30 of the motor shaft 3 by welding, and an outer peripheral portion is integrated with an axial central portion of the inner peripheral portion of the hub portion 45. Yes.

  The hub portion 45 includes a stopper portion 45a provided at one end portion in the axial direction of the outer peripheral portion and a plurality of crimping claws (not shown) provided at the other end portion in the axial direction of the outer peripheral portion. The caulking claw is bent in a direction in which the motor rotor 41 is pressed against the stopper portion 45a, so that the inner peripheral portion of the motor rotor 41 is supported in the axial direction so as to rotate integrally with the outer peripheral portion of the hub portion 45.

  The hub portion 45 is provided with a circumferential surface-like fitting portion 45c on one end side in the axial direction of the inner peripheral portion, and the outer peripheral portion of a resolver rotor 51 described later is integrally rotated in the fitting portion 45c. It is fixed and supported. The fitting portion 45c is formed with a linear key groove 45d along the axial direction, and a detent 51a formed on the outer peripheral portion of the resolver rotor 51 is engaged therewith. Further, a plurality of crimping claws 45e are formed on the opening side of the fitting portion 45c, that is, on the side opposite to the flange portion 44 in the axial direction.

  The motor rotor 41 includes a substantially cylindrical rotor core 46, a plurality of permanent magnets 43 embedded through the rotor core 46 in the axial direction, and a pair of end plates provided on both sides of the rotor core 46 in the axial direction ( One of which is not shown) 47. The rotor core 46 has a steel plate that is a plurality of annular magnetic bodies that are supported by an inner peripheral portion fixed to the outer peripheral portion of the rotor hub 40 and stacked in the axial direction.

  Each end plate 47 has a disc shape, and is pressed in the axial direction by a caulking claw bent at the other end in the axial direction, and is clamped in the axial direction by positioning one end in the axial direction by the stopper portion 45a. Thus, the rotor core 46 is clamped in the axial direction.

  The motor stator 42 includes an annular stator core 48 disposed on the outer peripheral side of the rotor core 46 and fixed to the case 2, and a stator coil 49 wound around the stator core 48. The stator core 48 is constituted by a plurality of annular steel plates that are laminated in the axial direction, and is fastened to the case 2 by a bolt (not shown) so as not to rotate.

  The resolver 5 is disposed on the inner peripheral side of the fitting portion 45 c of the hub portion 45 of the rotor hub 40. The resolver 5 includes a resolver stator 50 fastened to the case cover 20 by bolts 7 and a resolver rotor (second rotor) 51 fixed so as to rotate integrally with the fitting portion 45 c of the hub portion 45. The resolver 5 detects the rotational position (phase) of the resolver rotor 51 and transmits the result to a control unit (not shown). The controller refers to the detection value detected by the resolver 5 and appropriately controls the rotation speed of the motor 4. That is, the resolver 5 has a resolver rotor 51 that is supported by the inner periphery of the rotor hub 40 and fixed to rotate integrally with the rotor hub 40, and detects the rotational position of the resolver rotor 51. The rotational position of the motor rotor 41 can be detected.

  The resolver stator 50 includes a resolver stator core 52 and a resolver stator coil 53. The resolver stator core 52 is made of a steel plate that is a plurality of annular magnetic bodies stacked in the axial direction. Moreover, the resolver stator core 52 has a tooth part in each position which equally divides an inner peripheral surface, and the resolver stator coil 53 is wound around each tooth part. The resolver stator coil 53 has an excitation coil and a detection coil.

  As shown in FIG. 2A, the resolver rotor 51 has an outer peripheral surface formed in a circular shape and an inner peripheral surface formed in a shape in which four corners of a square are rounded. A part of the stopper 51a is projected. As shown in FIG. 1, when the resolver rotor 51 is fitted into the fitting portion 45c, the rotation stopper 51a is engaged with the key groove 45d formed in the fitting portion 45c, thereby causing the hub portion This is to prevent relative rotation of the resolver rotor 51 with respect to 45.

  An annular spacer (fixing tool) 54 is arranged on the resolver rotor 51 on the axial flange portion 44 side, and an annular retainer (fixing tool) is placed on the opposite side of the axial flange portion 44. ) 55 is arranged. As a result, the resolver rotor 51 is positioned in the axial direction without falling off by bending the caulking claw 45e of the fitting portion 45c while being sandwiched in the axial direction by the spacer 54 and the retainer 55. Yes. As will be described later, the spacer 54 and the retainer 55 are made of a nonmagnetic material such as stainless steel.

  Then, by passing an alternating current through the exciting coil of the resolver stator coil 53 of the resolver stator 50, the voltage induced in the detection coil of the resolver stator coil 53 changes according to the rotor angle of the resolver rotor 51. Based on this voltage change, the rotational position of the motor rotor 41 is detected.

  Next, a configuration for magnetically insulating the resolver rotor 51 and the rotor hub 40, which is a characteristic part of the present invention, will be described in detail below.

  An insulating portion 8 that magnetically insulates the resolver rotor 51 and the rotor hub 40 is provided at least partially between the outer peripheral portion of the resolver rotor 51 and the fitting portion 45c. In the present embodiment, four protrusions 51b are formed on the outer peripheral portion of the resolver rotor 51, and the resolver rotor 51 is positioned in the radial direction with respect to the rotor hub 40 by each protrusion 51b, and between the protrusions 51b. These gaps constitute the insulating portion 8. The four protrusions 51b are arranged with an interval of 90 ° in the circumferential direction.

  In the present embodiment, the protruding portion 51b is provided on the outer peripheral portion of the resolver rotor 51 in the opposing surface between the outer peripheral portion of the resolver rotor 51 and the fitting portion 45c. For this reason, when forming the projection 51b, it is only necessary to provide the projection 51b in the press die for forming the steel plate constituting the resolver rotor 51, and an increase in manufacturing cost can be suppressed.

  Further, as shown in FIG. 3, each protrusion 51 b is disposed at a position facing the same pole among the plurality of permanent magnets 43 embedded in the motor rotor 41. For example, in the present embodiment, 16 permanent magnets 43, that is, only 8 pairs are provided. And each protrusion part 51b is arrange | positioned in four places of the position facing the south pole of the permanent magnet 43. As shown in FIG. 3 is an explanatory view schematically showing the positional relationship between the protrusions 51b and the permanent magnets 43. Therefore, the rotor hub 40 is omitted, and the intervals between the permanent magnets 43 and the protrusions 51b. The spacing is different from the actual. Needless to say, the number of permanent magnets 43 and protrusions 51b is not limited to the example of the present embodiment.

  Here, when the resolver rotor 51 is in direct contact with the fitting portion 45c without the insulating portion 8 being present, the magnetic path passing through the resolver rotor 51 between the permanent magnets 43 of different poles adjacent to each other ( 3), the measurement accuracy of the resolver 5 is reduced. On the other hand, in this embodiment, while the insulating part 8 is provided between the resolver rotor 51 and the fitting part 45c, each protrusion part 51b and the permanent magnet 43 are arrange | positioned as mentioned above, Therefore Generation of a magnetic path in the rotor 51 is suppressed, and a decrease in measurement accuracy of the resolver 5 can be suppressed. Further, the rotation stopper 51a is also disposed at a position facing the same pole of the permanent magnet 43, and further suppresses the generation of a magnetic path in the resolver rotor 51.

  The operation of the driving device 1 described above will be described below. Here, the case where the motor 4 is energized and driven and the rotational position is detected by the resolver 5 will be described.

  When the motor stator coil 49 of the motor 4 is energized, the motor rotor 41 rotates. As the motor rotor 41 rotates, the resolver rotor 51 also rotates. At this time, magnetic flux leaks from the permanent magnet 43 of the motor rotor 41 to the rotor hub 40. Further, a magnetic flux having a strength corresponding to the energized voltage leaks from the motor stator 42 to the rotor hub 40.

  A part of the leakage magnetic flux reaches the fitting portion 45 c of the rotor hub 40. Here, since the insulating portion 8 is formed between the fitting portion 45 c and the resolver rotor 51, the leakage magnetic flux of the fitting portion 45 c is suppressed from leaking to the resolver rotor 51. Further, projections 51b are formed to position the resolver rotor 51 in the radial direction, and each projection 51b is in contact with the fitting portion 45c. However, since each protrusion 51b is arranged to face the same poles of the permanent magnet 43 of the motor rotor 41, leakage magnetic flux from the permanent magnet 43 is prevented from leaking.

  Furthermore, the resolver rotor 51 is in contact with the fitting portion 45c in the axial direction via the spacer 54 and the retainer 55. Since the spacer 54 and the retainer 55 are made of a non-magnetic material, the leakage magnetic flux of the fitting portion 45c. Leakage to the spacer 54 and the retainer 55 is prevented, and leakage to the resolver rotor 51 is suppressed.

  As described above, according to the drive device 1 of the present embodiment, the resolver rotor 51 and the rotor hub 40 are provided at least partially between the outer peripheral portion of the resolver rotor 51 and the inner peripheral portion of the fitting portion 45c of the rotor hub 40. Are provided with an insulating portion 8 formed of a gap that magnetically insulates from each other. For this reason, the leakage magnetic flux that has entered the rotor hub 40 from the motor rotor 41 and the motor stator 42 is less likely to leak to the resolver rotor 51, and the magnetic flux generated from the excitation coil of the resolver stator 50 is received from the leakage magnetic flux when passing through the resolver rotor 51. Since the inhibition can be reduced, a decrease in the measurement accuracy of the resolver 5 can be suppressed.

  Further, according to the driving device 1 of the present embodiment, the protrusion 51b for positioning the resolver rotor 51 in the radial direction is formed on the outer peripheral portion of the resolver rotor 51, so that, for example, a steel plate constituting the resolver rotor 51 is pressed. It can be manufactured easily and at low cost by a method such as punching out with a.

  Further, according to the driving device 1 of the present embodiment, the plurality of protrusions 51 b are arranged at positions facing the same pole among the plurality of permanent magnets 43 embedded in the motor rotor 41. For this reason, even if the magnetic flux leaks to the resolver rotor 51 through the one protrusion 51 b facing from the one permanent magnet 43, the other protrusion 51 b faces the permanent magnet 43 having the same polarity as the one permanent magnet 43. Therefore, the magnetic flux leaking from the other protrusion 51 b to the other permanent magnet 43 via the one protrusion 51 b and the resolver rotor 51 facing each other from the one permanent magnet 43 is not formed. Therefore, since the obstruction received from the leakage magnetic flux in the resolver stator 50 can be further reduced, a decrease in measurement accuracy of the resolver 5 can be suppressed.

  Further, according to the drive device 1 of the present embodiment, the resolver rotor 51 is made of a nonmagnetic material so that the resolver rotor 51 is sandwiched in the axial direction and the axial position with respect to the rotor hub 40 is restricted, and the retainer 55 is made of a nonmagnetic material. 51 is magnetically insulated from the rotor hub 40 not only in the circumferential direction but also in the axial direction. For this reason, the leakage magnetic flux of the rotor hub 40 becomes more difficult to leak to the resolver rotor 51, and the inhibition received from the leakage magnetic flux in the resolver stator 50 can be further reduced, so that a decrease in measurement accuracy of the resolver 5 can be suppressed. .

[Second Embodiment]
Next, a driving apparatus 1 according to a second embodiment of the present invention will be described with reference to FIG. Unlike the first embodiment, the drive device 1 has a different configuration in that a plurality of protrusions for positioning the resolver rotor 51 in the radial direction with respect to the rotor hub 40 are provided on the rotor hub 40 instead of the resolver rotor 51. To do. Since the other configuration is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are given and description thereof is omitted.

  In the present embodiment, as shown in FIG. 4, a protrusion 45 f protruding toward the resolver rotor 51 is formed on the inner peripheral surface of the fitting portion 45 c of the hub portion 45 of the rotor hub 40. Each protrusion 45f is in contact with the outer peripheral surface of the resolver rotor 51, and positions the resolver rotor 51 in the radial direction. The space between the projecting parts 45f constitutes the insulating part 8 as in the first embodiment. Furthermore, each protrusion 45f is arranged at a position facing the same pole among the plurality of permanent magnets 43 embedded in the motor rotor 41, as in the first embodiment. In addition, each protrusion part 45f can be formed by cutting out the internal peripheral surface of the fitting part 45c, for example.

  Here, the protruding portion may be any one that protrudes and contacts either the resolver rotor 51 or the rotor hub 40 toward the other and positions the resolver rotor 51 in the radial direction with respect to the rotor hub 40. The protrusion 51b may be provided on the resolver rotor 51 as in the first embodiment, or the protrusion 45f may be provided on the rotor hub 40 as in this embodiment.

  Further, a contact portion 45g with which the side surface of the resolver rotor 51 abuts is formed on the axial flange portion 44 side of each protrusion 45f. Further, an annular retainer 55 is disposed on the opposite side of the axially flange portion 44 of the resolver rotor 51. As a result, the resolver rotor 51 is positioned in the axial direction without falling off by bending the caulking claw 45e of the fitting portion 45c while being sandwiched in the axial direction by the contact portion 45g and the retainer 55. It has become.

  Similarly to the first embodiment, the drive device 1 of the present embodiment also includes the insulating portion 8 formed of a gap between the outer peripheral portion of the resolver rotor 51 and the inner peripheral portion of the fitting portion 45c of the rotor hub 40. Therefore, the obstruction received from the leakage magnetic flux in the resolver rotor 51 can be reduced, and the decrease in measurement accuracy of the resolver 5 can be suppressed.

  Also, with the driving device 1 of the present embodiment, the projections 45f are arranged so as to face the permanent magnets 43 of the same polarity, so that the generation of a magnetic path in the resolver rotor 51 is suppressed, and the measurement accuracy of the resolver 5 is measured. Can be suppressed.

[Third Embodiment]
Next, the drive device 1 which concerns on the 3rd Embodiment of this invention is demonstrated along FIG. Unlike the first embodiment, the drive device 1 includes the insulating ring 9 made of a nonmagnetic material without the insulating portion 8 made of a gap in order to magnetically insulate the resolver rotor 51 and the rotor hub 40. Different configuration in terms of provision. Since the other configuration is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are given and description thereof is omitted.

  In the present embodiment, as shown in FIG. 5, an insulating ring (insulating portion) 9 made of a nonmagnetic material such as stainless steel is provided between the resolver rotor 51 and the rotor hub 40 in a thin, substantially cylindrical shape. The insulating ring 9 has a notch portion 9a for avoiding interference between the rotation stopper 51a of the resolver rotor 51 and the key groove 45d of the hub portion 45, and the resolver rotor 51 and the hub portion 45 do not contact in the axial direction. And a spacer portion 9b interposed therebetween. When the resolver rotor 51 is fixed in the axial direction, the resolver rotor 51 is fixed together with the insulating ring 9 by bonding or bending the caulking claw 45e.

  Also in the drive device 1 of this embodiment, as in the first embodiment, the insulating ring 9 made of a nonmagnetic material is provided between the outer peripheral portion of the resolver rotor 51 and the inner peripheral portion of the fitting portion 45c of the rotor hub 40. Therefore, the obstruction received from the leakage magnetic flux in the resolver rotor 51 can be reduced, and the decrease in measurement accuracy of the resolver 5 can be suppressed.

  In the drive device 1 of each embodiment described above, the outer peripheral portion of the resolver rotor 51 and the inner peripheral portion of the fitting portion 45c of the rotor hub 40 are not magnetically insulated over the entire periphery. However, the rotation stopper 51a or the protrusions 51b and 45f are in contact with each other. However, the present invention is not limited to this, and may be magnetically insulated over the entire circumference.

  Moreover, in the drive device 1 of this Embodiment, the case where the drive device 1 was applied to a hybrid vehicle was demonstrated. However, the drive device according to the present invention is not limited to this, and can be applied to all vehicles equipped with a rotating electrical machine such as an electric vehicle.

1 Drive device 4 Motor (rotary electric machine)
5 Resolver 8 Insulating part 9 Insulating ring (insulating part)
40 rotor hub 41 motor rotor (first rotor)
43 Permanent magnet 45f Protrusion 51 Resolver rotor (second rotor)
51b Projection 54 Spacer (fixing tool)
55 Retainer (fixture)

Claims (5)

A rotating electrical machine having a rotor hub that supports the inner periphery of the first rotor;
The outer peripheral portion is supported by the inner peripheral portion of the rotor hub, and the second rotor is fixed to rotate integrally with the rotor hub, and the first rotor is detected by detecting the rotational position of the second rotor. In a drive device comprising a resolver capable of detecting the rotational position of a rotor,
An insulating portion that magnetically insulates the second rotor and the rotor hub is provided at least at a portion between the outer peripheral portion of the second rotor and the inner peripheral portion of the rotor hub.
A drive device characterized by that. A plurality of outer peripheral portions of the second rotor and inner peripheral portions of the rotor hub that protrude toward the other and contact with each other and that position the second rotor in the radial direction with respect to the rotor hub With protrusions,
The drive device according to claim 1. The plurality of protrusions are formed on the outer periphery of the second rotor.
The drive device according to claim 2, wherein: The plurality of protrusions are disposed at positions facing the same polarity of the plurality of permanent magnets embedded in the first rotor.
The drive device according to claim 2, wherein the drive device is provided. A fixing device for holding the second rotor in the axial direction and regulating an axial position with respect to the rotor hub;
The fixture is made of a nonmagnetic material.
The drive device according to any one of claims 1 to 4, wherein the drive device is provided.

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