Current control for microprocessor motor drive

Details Current control for microprocessor motor drive Current control for microprocessor motor drive

1988-07-27

1990-09-18

Smith, Jerry

Boots, shoes, and leggings

318801, 318806, 318811, H02D 540, H02P 126

Patent

active

049582690

ABSTRACT:
A motor control for controlling current in an induction motor. A microcomputer generates three inputs to control an inverter circuit that energizes the three phase windings of the motor. A speed control modulates the three inputs to adjust motor speed and voltage. A current sensing circuit also modulates the three inputs to reduce motor current using a technique that over rides the speed control. By monitoring the current sensing circuit the microcomputer adjusts the speed control to force motor current to a level near a set threshold value.

REFERENCES:
patent: 4371824 (1983-02-01), Gritter
patent: 4491768 (1985-01-01), Slicker
patent: 4602201 (1986-07-01), Edwards
patent: 4719398 (1988-01-01), Paice

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