Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1980-06-19
1982-12-28
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318798, 318806, 318714, H02P 540
Patent
active
043664296
ABSTRACT:
A variable speed controller for an alternating current induction motor reestablishes the start time for firing pulses and clock pulses in a circuit having a uniform frequency generator generating firing and clock pulses. Feedback from the stator terminals sets an oscillator with a sawtooth type ramp output. Subsequent feedback from the stator terminals are compared with the output of the oscillator in a comparator that establishes a time or phase shift in the generated output having the same frequency, for resetting the firing pulses so that the frequency of current to the stator winding is a function of the relationship between the stator and rotor positions, and of the current amplitude in the stator windings. Adjustment of the circuit parameters reduces the difference between the rotor and stator positions and optimizes stator current to maintain flux balance.
REFERENCES:
patent: 3662247 (1972-05-01), Schieman
patent: 3967173 (1976-06-01), Stich
HPS, Inc.
Scholnick Seymour A.
Smith Jr. David
Turner, Jr. Thomas A.
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