Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1988-06-21
1990-02-27
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318806, 318811, H02P 540
Patent
active
049049194
ABSTRACT:
A method and circuit for application in a PMW inverter for controlling power to an AC motor in which a hysteresis modulator is employed as a current limiter to override sine-triangle modulation in a PWM generator circuit. When the magnitude of motor current reaches a hysteresis band upper limit, the hysteresis modulator generates a large limit current to a summing input on a current regulator which feeds the PWM generator to override and mask out the normal sine-triangle modulated signal. When the magnitude of motor current decreases to a hysteresis band lower limit, the limit current is terminated, and the sine-triangle modulation is resumed.
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Allen-Bradley Company Inc.
Smith Jr. David
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