| 摘要 |
An electric motor has a supplementary field magnet including a magnetization coil, a yoke serving as a magnetic path for magnetic flux produced by the magnetization coil, and a variable magnet. The supplementary field magnet is arranged on one axial end side of the rotor with a gap. A rotor core is provided with first projections projecting toward one axial end side of the electric motor from first magnetic pole portions, and second projections projecting toward the one axial end side from second magnetic pole portions and arranged radially inward of the first projections. The yoke includes an outer magnetic pole portion axially opposed to the first projections, and an inner magnetic pole portion axially opposed to the second projections such that an annular gap is formed between the inner magnetic pole portion and the outer magnetic pole portion. |
