| 摘要 |
A reluctance motor and a brushless direct current motor capable of operating at a high efficiency, at a high speed and with a high torque. When one excitating coil or armature coil is deenergized, the magnetic energy accumulated in the magnetic core is prevented from returning to the power source side by a reverse current blocking diode, and a capacitor of a small capacitance is charged and maintained at a high voltage. Therefore, the current falls rapidly. After a given time, the next excitating coil or armature coil is energized, but the applied voltage at that time is a high voltage at which the capacitor is charged. Therefore, the current rises rapidly. Since the rising and falling of the charge are sharp, it is possible to obtain a revolution of several tens of thousands per minute. At the same time, a counter torque is produced by means of a chopper circuit to execute the regenerative braking by shifting to the reserve conduction mode during the normal rotation. |
