| 摘要 |
A synchronous motor which causes decrease in iron loss without increase in copper loss due to increase in q-axis current, and increases efficiency. The synchronous motor includes a rotor, the number of magnetic poles of which is changeable. The magnetic poles of the rotor include permanent magnets and electromagnets having changeable polarity, and the number of the magnetic poles of the rotor is changed by changing a current flow direction of the electromagnets. |
