Static speed control circuit for polyphase induction motors

Details Static speed control circuit for polyphase induction motors Static speed control circuit for polyphase induction motors

1976-09-10

1977-12-27

Rubinson, Gene Z.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318240, H02P 536

Patent

active

040657043

ABSTRACT:
A modified three-phase bridge circuit, incorporating resistors and thyristors connected in specific configuration in one leg of each phase circuit and diodes in a second leg, is adapted for connection to the motor rotor. A speed control signal, modulated with a triangular waveform of predetermined frequency, below the instantaneous rotor frequency, is applied to a plurality of AND circuits acting as pulse width modulators. Each AND circuit has an output coupled to the gate of one thyristor in each phase circuit. Changes in speed control signal representative of calls for increasing speed produce sequentially, on successive outputs, a train of pulses increasing in pulse width to full turn on. Additional thyristors are thus gated on in each phase circuit to modify the effective resistance presented by the resistors in each leg so as to smoothly decrease the resistance of the bridge circuit.

REFERENCES:
patent: 3375433 (1968-03-01), Haggarty et al.
patent: 3529224 (1970-08-01), Bedford
patent: 3657622 (1972-04-01), Reuland et al.

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