| 摘要 |
A bridge ( 8 ) in conformity with a tooth opening angle of the stator ( 1 ) is provided between a permanent magnet ( 5 ) and a permanent magnet ( 5 ) in a rotor ( 4 ), so that a magnetic flux for a reluctance torque is made to pass an inner side of the permanent magnet ( 5 ). An opening angle of each of ribs ( 7 ) on both sides of the permanent magnet ( 5 ) is set to be equal to or smaller than the teeth interval opening angle and equal to or larger than a half thereof. Thereby, reluctance of the rib ( 7 ) against a magnetic flux in a circumferential direction is increased and leakage of the magnetic flux of the permanent magnet ( 5 ) is prevented.
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