Speed control means for ac motor

Details Speed control means for ac motor Speed control means for ac motor

H - Electricity

02

P

318/103

H02P 25/14 (2006.01)

Patent

CA 1050609

ABSTRACT OF THE DISCLOSURE An unbalanced switching circuit is connected with a bi-directional control rectifier in such a manner that variation of counter electro motive forces produced by rotation of an AC motor affects the lower switching voltage in the unbalanced switching circuit through diodes and a capacitor to increase or decrease the conduction angle of the bi-directional control rectifier. In this manner, the switching circuit may be used to vary the speed of the motor and assure that the selected speed remains constant under varying loads. Furthermore, the switching circuit may be conveniently used in connection with a position setting means which ensures that the motor comes to rest in a predetermined, angular position.

240006

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