Magnetic device for controlling starting of a single phase induc

Details Magnetic device for controlling starting of a single phase induc Magnetic device for controlling starting of a single phase induc

1981-11-16

1983-06-14

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318786, H02P 142

Patent

active

043885802

ABSTRACT:
A starter device for a single phase A.C. motor having a main winding and a starting winding disposed for connection to a single A.C. source. This starter device comprises a semiconductor switching device having a control electrode and a transconductive path, such as, for example a triac. This switching device is connected in series with the starting winding and the single A.C. source to energize or disconnect this starting winding. A magnetic detector is disposed between two adjacent poles of the main winding of the stator of the motor and has its axis of detection extending in the direction of the lines of magnetic flux forced out of the two adjacent saturated poles of the main winding during the initial inrush of current through this main winding upon starting of the motor. This detector has its two terminals respectively connected to the control electrode and to one of the power electrodes of the switching device in order to supply the control electrode when a magnetic flux is sensed to activate the switching device and therefore, to energize the starting winding. Upon starting of the motor, the sensed magnetic flux induces a current through the detector and energizes the starting winding. When the motor runs at nominal speed, the starting winding is disconnected because no magnetic flux is sensed.

REFERENCES:
patent: 3116445 (1963-12-01), Wright
patent: 3538411 (1970-11-01), Knauer et al.
patent: 3573579 (1971-04-01), Lewus

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