JP2012157180A - Rotating machine with built-in resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve anti-magnetic performance of a resolver stator and cooling performance of a stator of a rotating machine by a simple configuration.SOLUTION: In a rotating machine 100 with built-in resolver, a resolver 30 measuring a rotating angle position of a rotor 16 is incorporated into a casing 10 of a non-magnetic material. The rotating machine 100 with built-in resolver has an anti-magnetic shield 40 of a non-magnetic material. The anti-magnetic shield 40 includes: an annular fixation ring 41 having a resolver stator 33 mounted to an inner peripheral face 41a thereof; a cylindrical part 42 extending axially from the fixation ring 41 and covering an outer peripheral face of a coil end 35 of the resolver stator 33; and an annular part 43 mounted to an axial end of the cylindrical part 42 and covering an axial end face of the coil end 35 of the resolver stator 33. The anti-magnetic shield 40 is disposed with a space from a stator 13 or the rotor 16 of the rotating machine 100.

Description

  The present invention relates to a structure of a resolver built-in type rotating machine.

  In recent years, a hybrid vehicle that travels by the output of an engine and an electric motor has been increasingly used. Such a hybrid vehicle has a built-in resolver that detects the rotational angle position of the motor rotor in order to efficiently control the engine and the motor. The resolver rotates an elliptical rotating body coaxially with the rotor of the motor, and detects the change in voltage or current of the winding of the resolver stator arranged around the rotating body to detect the rotational angular position of the rotor of the motor. There are many types of measuring. On the other hand, a rotating machine such as an electric motor and various devices mounted on a vehicle are required to be downsized due to the arrangement. For this reason, the resolver rotor and the resolver stator for detecting the rotation angle of the rotor of the rotating machine may be incorporated in the casing of the rotating machine.

  However, magnetic flux and radio noise generated from the stator and rotor of the rotating machine may affect the resolver signal. In particular, when the distance between the resolver stator incorporated in the casing of the rotating machine and the stator and rotor of the rotating machine is short, the effect is large, and noise is added to the resolver measurement signal, and the resolution of the resolver decreases. There was a problem of doing. For this reason, it has been proposed to provide an electromagnetic shield that covers the stator and rotor of the rotating machine so as to be integrated with the casing of the rotating machine (see, for example, Patent Document 1).

JP 2002-95200 A

  On the other hand, since the stator and rotor of the rotating machine generate heat during operation, it is necessary to cool them with cooling oil or the like. However, in the rotating machine of the prior art described in Patent Document 1, the electromagnetic shield is configured to substantially entirely cover the outer surfaces of the stator core and the coil, and therefore cooling can be performed by directly applying cooling oil to the stator coil. There is a problem that the cooling performance of the stator is deteriorated.

  In addition, the rotating machine described in Patent Document 1 requires a separate resolver stator after an electromagnetic shield is attached to the casing of the rotating machine, which takes time for assembly and complicates the structure. was there.

  An object of the present invention is to improve the magnetic resistance of a resolver stator and the cooling performance of a stator of a rotating machine with a simple configuration.

  A resolver built-in type rotating machine of the present invention is a resolver built-in type rotating machine in which a resolver for measuring the rotational angle position of a rotor is incorporated in a non-magnetic casing, and a resolver stator is attached to the inner peripheral surface thereof. An annular, non-magnetic fixing ring, a cylindrical portion extending in the axial direction from the fixing ring and covering the outer peripheral surface of the coil end of the resolver stator, and a coil end of the resolver stator attached to the axial end of the cylindrical portion A nonmagnetic magnetic shielding shield including an annular portion covering the axial end face, and the magnetic shielding shield is disposed with a space between the stator or the rotor of the rotating machine. .

  In the resolver built-in rotating machine according to the present invention, the magnetic shield is attached to the casing inner surface of the rotating machine after the resolver stator is assembled to the inner peripheral surface of the fixing ring. This is also preferable.

  The present invention has an effect of improving the magnetic resistance of the resolver stator and the cooling performance of the stator of the rotating machine with a simple configuration.

It is sectional drawing of the resolver built-in type rotary machine in embodiment of this invention. It is explanatory drawing which shows the structure of the magnetic-shielding shield and resolver stator of the rotary machine with a built-in resolver in embodiment of this invention. It is a perspective view which shows the structure of the magnetic-shielding shield and resolver stator of the rotary machine with a built-in resolver in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a resolver built-in type rotating machine 100 of this embodiment includes a casing 10 made of a nonmagnetic material such as aluminum, a stator 13 fixed in the casing 10, and a rotation center shaft 23. And a rotor 16 fixed to the shaft 15. The casing 10 includes a casing main body 11 to which a stator 13 is fixed, and a lid 12 fixed to the casing main body 11 with bolts 18. Ball bearings 19 and 20 are respectively attached to the casing body 11 and the lid 12, and the shaft 15 is rotatably supported by the ball bearings 19 and 20. A resolver 30 that detects the rotational angle position of the rotor 16 is attached to the lid 12 side of the rotating machine 100. The resolver 30 includes a resolver rotor 31 fitted on the lid 12 side of the shaft 19 and fixed by a ring 32, and a resolver stator 33 attached to the inner surface of the lid 12. The resolver stator 33 includes a stator core 34 in which electromagnetic steel plates are laminated, a coil wound around a slot provided in the stator core 34, and coil ends 35 protruding from both end surfaces in the axial direction of the stator core 34. 40 and is fixed to the lid 12 with bolts 36. A space 22 is formed between the magnetic shield 40 and the stator 13 and the rotor 16 of the rotating machine 100, and a space 21 is formed between the stator 13 of the rotating machine 100, the casing body 11, and the lid 12.

  As shown in FIG. 2A, the magnetic shield 40 includes a fixing ring 41, a cylindrical portion 42 extending in the axial direction from the fixing ring 41, and an annular portion 43 attached to the axial end of the cylindrical portion 42. It is configured so as to be integrated with a non-magnetic material. The fixing ring 41 has an annular plate shape whose thickness is slightly thicker than the thickness of the stator core 34 of the resolver stator 33, and a hole 37 for a bolt 36 is provided around the fixing ring 41. The diameter of the inner peripheral surface of the fixing ring 41 is substantially the same as the outer diameter of the stator core 34, and the outer peripheral surface 34 a of the stator core 34 is fitted into the inner peripheral surface 41 a of the fixing ring 41. It is attached. In the resolver stator 33, coil ends 35 protrude from both sides of the stator core 34 in the axial direction. The cylindrical portion 42 and the annular portion 43 of the magnetic shield 40 are configured to cover the outer peripheral surface and the axial end surface of the coil end 35 protruding in the direction opposite to the lid 12. Further, the outer peripheral surface and the axial end surface of the coil end 35 protruding in the direction of the lid 12 are each covered with a non-magnetic lid 12.

  When assembling the rotating machine 100 of the present embodiment, as shown in FIG. 3, first, the outer peripheral surface 34 a of the stator core 34 of the resolver stator 33 is attached to the inner peripheral surface 41 a of the fixing ring 41 of the magnetic shield 40. After being fitted into the peripheral surface 41a and fixed with an adhesive or the like to be integrated, the end face in the axial direction of the fixing ring 41 of the magnetic shield 40 is fixed to the lid 12 with a bolt 36 as shown in FIG. The stator 33 and the magnetic shield 40 can be attached at a time. For this reason, the resolver 30 can be easily incorporated.

  As shown in FIG. 1, the magnetic shield 40 has a cylindrical portion 42 and an annular portion 43 disposed between the stator 13 or the rotor 16 of the rotating machine 100 via the space 22, and thus the magnetic shield of the resolver 30. Thus, it is possible to suppress the magnetic flux and electromagnetic noise from the rotating machine 100 from affecting the measurement of the resolver 30. Since the magnetic shield 40 has a compact configuration, a space 22 is formed between the stator 13 of the rotating machine 100 and the coil end 14 of the stator 13 or between the rotor 16 of the rotating machine 100. Furthermore, since the space 21 can be formed in the outer peripheral portion of the coil end 14, a cooling oil nozzle or the like is arranged in these spaces to effectively cool the coil end 14 and the rotor 16 of the rotating machine 100. The cooling performance of the rotating machine 100 can be improved.

  DESCRIPTION OF SYMBOLS 10 Casing, 11 Casing main body, 12 Lid, 13 Stator, 14, 35 Coil end, 15 Shaft, 16 Rotor, 18, 36 Bolt, 19, 20 Ball bearing, 21, 22 Space, 23 Rotation center axis, 30 Resolver, 31 Resolver rotor, 32 ring, 33 resolver stator, 34 stator core, 34a outer peripheral surface, 37 holes, 40 magnetic shield, 41 fixed ring, 41a inner peripheral surface, 42 cylindrical portion, 43 annular portion, 100 rotating machine.

Claims (2)

A resolver built-in type rotating machine incorporating a resolver for measuring the rotational angle position of a rotor in a non-magnetic casing,
An annular, non-magnetic fixing ring to which the resolver stator is attached on its inner peripheral surface, a cylindrical portion extending axially from the fixing ring and covering the outer peripheral surface of the coil end of the resolver stator, and an axial direction of the cylindrical portion An annular part that is attached to the end and covers the axial end surface of the coil end of the resolver stator, and a nonmagnetic shield for shielding,
The resolver built-in type rotating machine, wherein the magnetic shield is disposed with a gap between the rotating machine and a stator or rotor. A resolver built-in rotating machine according to claim 1,
The magnetic shield is configured such that after the resolver stator is assembled to the inner peripheral surface of the fixing ring, the axial surface of the fixing ring is attached to the casing inner surface of the rotating machine.
Resolver built-in type rotating machine.

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