| 摘要 |
Controlled semiconductor switches are inserted in series with the armature windings of the motor. To effect commutation when the difference between counter emf and applied voltage is small, that is, when the counter emf is high, so that commutation of armature current is effected during low, or no armature current flow, the control circuit includes circuit elements connected to and controlling current flow in the stator winding to considerably reduce the flow therethrough shortly before the theoretical commutation time, and increase current, or connect current to flow only shortly after the theoretical commutation time so that reliable commutation is effected. These circuit elements may, for example, be capacitors, R/C networks, artificial inductances, and the like, or circuits superimposing additional commutating signals derived directly from the induced counter emf, or by a separate sensing coil to the power supply for the commutating element.
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