Variable speed control for AC induction motors

Details Variable speed control for AC induction motors Variable speed control for AC induction motors

1999-07-23

2000-10-31

Masih, Karen

Electricity: motive power systems

Induction motor systems

Primary circuit control

318254, 318138, 318439, 318807, 318599, 318801, H02P 318

Patent

active

06140795&

ABSTRACT:
A speed control apparatus for varying the speed of an AC motor while maintaining the torque and power constant over a range of angular speeds The AC motor is driven by a D.C. source. A universal conmutator capable of providing two symmetrical non-contending signals with a frequency that can be selectively varied. A microprocessor unit for monitoring the frequency of the signals and control proportionally varying the duty cycle of the signals calculates the necessary duty cycle to maintain the torque constant over a range of angular speeds.

REFERENCES:
patent: 5592062 (1997-01-01), Bach
patent: 5661379 (1997-08-01), Johnson
patent: 5838134 (1998-11-01), Cummins

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