Current limiting control circuit for d.c. motors with line...

Details Current limiting control circuit for d.c. motors with line... Current limiting control circuit for d.c. motors with line...

H - Electricity

02

P

318/103, 318/79

H02P 1/18 (2006.01) H02P 7/28 (2006.01)

Patent

CA 2009838

ABSTRACT In accordance with a first embodiment of the invention, line dropout protection is provided for a d.c. motor wherein motor operation is prevented if power is applied at the time a main speed control device is not set in a zero position. Re-enabling motor operation is simply provided by resetting the motor speed control device to a zero position and reapplying power. In accordance with the second embodiment of the invention, line dropout protection is provided for a d.c. motor wherein predetermined excess motor acceleration is prevented when power is applied to the d.c. motor. The instant invention prevents motor start-up under unexpected conditions, thereby clearly enhancing safety during operation of any device controlled by the d.c. motor.

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