Overload protecting device

Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits

Patent

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Details

361110, 318434, H02H 504

Patent

active

057197326

ABSTRACT:
An overload protecting device which includes a comparator 11 to which an output voltage V10 in proportion to the current flowing through a motor 5 and a start detecting reference voltage E11 are inputted, and a comparator 13 to which the output voltage V10 and an overload detecting reference voltage E13 are inputted, a starting timer 14 for clocking a first period of time T1 lapsing since the output of a signal from the comparator 11, an overload timer 14 for clocking a second period of time T2, which is shorter than the first period of time T1, lapsing since the output of a signal from the comparator 13, a transient finish detecting circuit 300 for outputting a signal V33 representing a finish of transient of the motor 5 finish based on signal outputted from the comparators 11 and 13, and an overload trip relay 18 for cutting off a motor current to the motor 5 through the logical operation of the signal V33 representing motor transient finish or an output signal V12 from the starting timer 12, with an output signal V14 from the overload timer 14. The driving mechanism driven by the motor 5 is properly protected from the overload.

REFERENCES:
patent: 4268884 (1981-05-01), Ford, Jr. et al.
patent: 4412162 (1983-10-01), Kitamura

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