| 摘要 |
A reluctance-type electric motor of the invention is provided with a reverse current-preventing diode which prevents the released electric power of magnetic energy of a first exciting coil from refluxing into a DC power source. The object of the prevention is that when the flow of current to the first exciting coil is interrupted, the magnetic energy stored therein is transformed into the magnetic energy of a second exciting coil to which a current is supplied next in order that magnetic energy is quickly released from the first exciting coil and is quickly stored in the second exciting coil. Further, the magnetic energy in the first exciting coil is charged in a capacitor of a small capacitance to produce a high voltage. By using this high voltage, the magnetic energy is stored in the second exciting coil in order to quickly release and store magnetic energy and to prevent the torque from decreasing or to prevent the antitorque from generating. Therefore, even when the applied voltage is low, the reluctance-type motor rotates at high speeds with high efficiency. Further, the exciting current is a saw-tooth wave whose current value at the last stage is larger than that at the initial stage in order to improve the rise in the exciting current. |
