Variable speed controller with improved efficiency of energy tra

Details Variable speed controller with improved efficiency of energy tra Variable speed controller with improved efficiency of energy tra

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

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