Overload protection for series resistances of electric motors, e

Details Overload protection for series resistances of electric motors, e Overload protection for series resistances of electric motors, e

1986-09-26

1988-06-21

Tolin, G. P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 33, 318421, H02H 500

Patent

active

047528516

ABSTRACT:
Overload protection for the series resistance of an electric motor in which a voltage drop across the electric motor is monitored. During the occurrence of a reduced voltage drop, for example, as a result of a blocking of the motor or of a fan driven by the electric motor, the series resistance is short-circuited by a relay so that the blocking can be overcome by an increased driving torque of the electric motor or a fuse in the load current input line to the motor responds. As a result thereof, an effective overload protection is created which is of simple construction, involves no additional wiring expenditure and requires few additional components and which also permits to dimension the series resistance for normal operating currents and to be able to dispense with a thermal monitoring.

REFERENCES:
patent: 4249118 (1981-02-01), Roof
patent: 4408244 (1983-10-01), Weible
patent: 4430682 (1984-02-01), Babsch
patent: 4611154 (1986-09-01), Lambropoulos et al.

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