| 摘要 |
1. An electronic commutating device for direct current machines with a plurality of phase-windings having semiconductor switching elements which can be controlled into the blocking state via their control electrodes, and wherein each of the semiconductor switching elements is suddenly switched over to the conducting or blocking state, as the case may be, by "on" and "off" signals derived from the position of the rotor, characterised in that the "off" signal for the respective semiconductor switching element (4 to 6) of the phase-winding (1 to 3) which is to be disconnected is delayed compared with the "on" signal for the respective semiconductor switching element (4 to 6) of the superseding phase-winding (1 to 3) the delay being so calculated that the current in the phase-winding to be disconnected is completely or partially damped as a result of the equalizing current caused by the machine EMF. |
