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Patent Searching and Data


Title:
INTERIOR PERMANENT MAGNET MOTOR
Document Type and Number:
WIPO Patent Application WO/2014/038062
Kind Code:
A1
Abstract:
The present invention provides an interior permanent magnet motor which allows for improved riding comfort by mitigating electromagnetic vibrational forces attributable to cogging torque and is capable of operating in a high-speed range by reducing q-axis inductance. In this interior permanent magnet motor, a rotor core is configured from a plurality of divided rotor cores arranged coaxially such that the centers of their magnetic poles are aligned in the axial direction and such that the divided rotor cores are in close contact with each other, and auxiliary grooves are recessed on the outer circumferential surface of each of the plurality of divided rotor cores at positions between magnetic poles such that each auxiliary groove is symmetric with respect to a plane containing the center position between the corresponding magnetic poles and the axial center of the respective divided rotor core and extends from one side of the divided rotor core in the axial direction to the other side. Auxiliary grooves recessed on the circumferential surface of the same divided rotor core have the same groove shape, and the widths of the auxiliary grooves recessed on the circumferential surfaces of the plurality of divided rotor cores are set such that predetermined orders of cogging torque harmonic components (electrical angles) caused by each of the plurality of divided rotor cores cancel out with each other.

Inventors:
KAYANO SHINSUKE (JP)
INOUE MASAYA (JP)
NISHIMURA SHINJI (JP)
Application Number:
PCT/JP2012/072875
Publication Date:
March 13, 2014
Filing Date:
September 07, 2012
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
KAYANO SHINSUKE (JP)
INOUE MASAYA (JP)
NISHIMURA SHINJI (JP)
International Classes:
H02K21/16; H02K1/27
Foreign References:
JP2009081909A2009-04-16
JP2002058218A2002-02-22
JP2004048912A2004-02-12
Attorney, Agent or Firm:
SOGA, Michiharu et al. (JP)
Michiharu Soga (JP)
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