Nissan Motor Company Limited

Tohru Nakada

Kohei Murota

Shunji Oki

A rotor structure for an electric rotating machine has a rotor, a plurality of strip-shaped permanent magnets which are arranged in a circumferential direction of the rotor, each of which penetrates the rotor in an axial direction of the rotor, flux barriers which are air gaps provided at positions corresponding to width-direction end portions of the permanent magnets to face the width-direction end portions of the permanent magnets, and demagnetization prevention holes, each of which is provided at a position in a vicinity of a corresponding one of the flux barriers and on an opposite side of the flux barrier from a stator and configured to reduce demagnetization at a corresponding one of the width-direction end portions of the permanent magnets.

Rotor structure for electric rotating machine

A flux barrier includes a radially outer proximate part and a radially inner proximate part that are a rotor radially outer side surface and a rotor radially inner side surface extending from a communicating part, at least one of the radially outer proximate part and the radially inner proximate part is connected to an end part of a magnet fixing part of a magnet hole in an inward direction of the magnet hole, and a projecting part projecting in an inward direction of the flux barrier is provided on at least one of the radially outer proximate part and the radially inner proximate part connected to the magnet fixing part. A constricted part in which a width of the flux barrier is narrower than on a side closer to the communicating part than the projecting part is formed by the projecting part.

Permanent magnet rotor with flux barrier for reduced demagnetization

A rotor core is provided in which a plurality of poles each composed of a pair of first permanent magnets arranged in a V-shape open toward an outer peripheral side and a second permanent magnet arranged in parallel to a circumferential direction in an open part of the V-shape are arranged in the circumferential direction while alternately changing the polarities thereof. A groove is formed which has a groove center in a range between an electrical angle position shifted by &#xbc; cycle of a harmonic component of an induced voltage toward a d-axis and an electrical angle position shifted by &#x215b; cycle of the harmonic component toward a q-axis from a base point located between a line connecting a rotor outer peripheral side corner portion of the second permanent magnet and a rotor shaft center and the q-axis out of a plurality of dividing lines connecting a plurality of dividing points set at an electrical angle interval corresponding to one cycle of the harmonic component from the d-axis to the q-axis on the rotor core outer periphery and the rotor shaft center.

Rotor for electric motor

A rotating electric machine rotor is equipped with a rotor core and a pair of permanent magnets disposed in a V-shape that opens toward an outer periphery of the rotor core. The pair of permanent magnets is separated in an inner periphery direction of the rotor core, and the rotor core contains a gap formed by connecting between at least the separated permanent magnets.

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Yokohama, Japan

Tohru Nakada