Heating circuit for an electric motor

Details Heating circuit for an electric motor Heating circuit for an electric motor

1978-07-26

1980-03-25

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

318436, 318471, H02H 708

Patent

active

041953240

ABSTRACT:
An SCR is connected across one of three line contacts which couple the power lines to the windings of an a.c. motor. When the line contacts are opened to shut down the motor, heating current is applied to one of the motor windings through the SCR to raise its temperature above the ambient dew point. The SCR is fired every cycle of the line current and the firing angle is controlled in response to a command signal to provide the proper amount of heating current in the motor winding. The command signal is generated by summing a preselected reference signal with a negative feedback signal which is indicative of the amount of motor heating.

REFERENCES:
patent: 3582712 (1971-06-01), Blair
patent: 3717804 (1973-02-01), Dikinis
patent: 3774096 (1973-11-01), Hann
patent: 3959692 (1976-05-01), Wetzel
patent: 4135122 (1979-01-01), Holmquist et al.

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