| 摘要 |
An electronic commutation circuit for a three phase electric motor is supplied with direct current by a circuit having a high internal non-ohmic impedance in relation to the impedance of the load. The supply circuit comprises an electronic interrupter, an inductance coil and a resistance in series with the motor commutation circuit. The supply circuit is opened when the current reaches a selected upper limit value and is closed when the current reaches a lower limit value thereby maintaining the current substantially constant. The limits may be made responsive to a motor function, for example speed or load. The switching of the commutating circuit is effected by transistors or thyristors under control of a cyclical impulse generator and distributor. |
