Pulse excitation torque amplifier

Details Pulse excitation torque amplifier Pulse excitation torque amplifier

1976-11-22

1977-12-27

Hohauser, Herman

Electricity: motive power systems

With flywheel or massive rotary member

H02P 146

Patent

active

040657035

ABSTRACT:
A starting control system for synchronous motors having circuits for detecting motor speed, the zero crossings of the current induced in the field windings, and the motor load angle. A circuit responsive to the detected motor speed, zero crossings and load angle triggers the DC excitation of the field at the zero crossings upon reaching a predetermined rotor speed and terminates the DC excitation at predetermined load angles. The pulsed DC excitation provides a torque that pulls the rotor into synchronism within several rotor slip cycles. In one embodiment the pulsed DC excitation is applied on both positive and negative half-cycles of the induced field current waveform.

REFERENCES:
patent: 3588645 (1971-06-01), Gilmore
patent: 4012679 (1977-03-01), Matsuda et al.

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