Drive and protection system for variable speed motor

Details Drive and protection system for variable speed motor Drive and protection system for variable speed motor

1987-09-08

1988-10-25

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 323286, 361 90, 361 30, H02P 540, H02H 7122

Patent

active

047806567

ABSTRACT:
An electronic control for a motor drives the motor with pulses of current, and protects the motor from extreme values of line voltage and motor current. A current sensor, connected in series with a conductor which supplies current to the motor windings, develops a monitoring signal that is sensed for the purpose of shutting down the motor when the monitoring signal indicates that the motor current is excessive. A power supply in the control isolates the control from the AC line voltage, provides regulated DC voltages to power various portions of the control, and provides an unregulated DC sense voltage which indicates when the AC line voltage is too high or too low so that the motor can be shut down.

REFERENCES:
patent: 4527214 (1985-07-01), Hattori et al.
patent: 4594517 (1986-06-01), Cohen et al.
patent: 4686617 (1987-08-01), Colton
patent: 4695961 (1987-09-01), Arinobu
G.E. Publication "Electronics Data Library--Semiconductors; Transistors--Diodes", 2nd Edition, 1984; pp. 148-161.

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