Protective circuit for an electric motor

Details Protective circuit for an electric motor Protective circuit for an electric motor

1982-12-10

1985-03-12

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 28, 361240, 361242, 318434, 318461, 318476, H02H 7093

Patent

active

045048819

ABSTRACT:
A protective circuit for an electric motor comprises a frequency signal generating circuit for generating a frequency signal in accordance with the rotational speed of the motor, a switching circuit switched over to either permit or cut off supply of current to the motor, and a detecting circuit for detecting that the period of the generated frequency signal has become larger than a predetermined period due to a decrease in the rotational speed of the motor, and cutting off the supply of current to the motor by the switching circuit.

REFERENCES:
patent: 3636545 (1972-01-01), Boyd et al.
patent: 3845375 (1974-10-01), Stiebel
patent: 3931557 (1976-01-01), Osburn
patent: 4314186 (1982-02-01), Gille et al.

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