Permanent magnet synchronous motor
AssigneesNissan Motor Co., Ltd., Wisconsin Alumni Research Foundation
InventorsKensuke Sasaki, Takashi Fukushige, Takashi Katou, Apoorva Athavale, Robert D. Lorenz
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Abstract
A permanent magnet synchronous motor includes a stator, a rotor rotatable relative to the stator, and a magnetic structure with a low coercive force magnet and a high coercive force magnet that are arranged magnetically in series with respect to each other to define a pole-pair of the permanent magnet synchronous motor. A magnetization level of the low coercive force magnet is changeable by a stator current pulse such that a stator magnetomotive force at a rated current is equal to or larger than a product of a magnetic field strength for fully magnetizing the low coercive force magnet and a thickness of the low coercive force magnet.
Claims8
A permanent magnet synchronous motor comprising:
- a stator;
- a rotor rotatable relative to the stator;
- and
- a magnetic structure with a low coercive force magnet and a high coercive force magnet that are arranged magnetically in series with respect to each other to define a pole-pair of the permanent magnet synchronous motor,
- a magnetization level of the low coercive force magnet being changeable by a stator current pulse, and
- a rated current of the permanent magnet synchronous motor being set such that a stator magnetomotive force at the rated current is equal to or larger than a product of a magnetic field strength for fully magnetizing the low coercive force magnet and a thickness of the low coercive force magnet.
Dependencies are inferred from the claim text.