Overload-protection circuit for electric motors

Details Overload-protection circuit for electric motors Overload-protection circuit for electric motors

1978-02-03

1979-05-22

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 31, 361 93, 361 94, H02H 708

Patent

active

041562623

ABSTRACT:
An overload-protection circuit for an electric motor has a current transformer whose primary winding is connected in series with the windings of the motor to be protected while two secondary windings are provided. The first secondary winding is connected to an actual-value current-monitoring circuit while the second secondary winding forms part of a voltage-supply network for the circuit. The primary winding is subdivided into a plurality of winding sections having respective taps for different nominal values of the overload current. The product of the number of turns of each winding section and the nominal-current value of the respective tap (ampere-turns) is the same for each winding and the respective tap.

REFERENCES:
patent: 3296495 (1967-01-01), Paddison
patent: 3544846 (1970-12-01), Thompson
patent: 3845373 (1974-10-01), Totsu et al.

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