Control circuit for running a polyphase synchronous motor in a d

Details Control circuit for running a polyphase synchronous motor in a d Control circuit for running a polyphase synchronous motor in a d

1988-03-16

1989-05-23

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318685, H02P 540

Patent

active

048333875

ABSTRACT:
A control circuit for operating a synchronous motor with a polyphase armature winding in a d-c voltage network comprises a switch device for successively connecting the winding phases with the network, a switch signal generator which produces switch signals for the switch device, a logical stage for logically loading the switch devices with said signals. The circuit also includes a voltage/frequency converter, a starting device and a re-starting device. The converter generates a pulse succession which is increased by the starting member from zero to a predetermined value to re-start the motor when its current exceeds a predetermined value.

REFERENCES:
patent: 4250435 (1981-02-01), Alley et al.
patent: 4642543 (1987-02-01), MacMinn

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