Circuit arrangement for overload protection of a drive motor

Details Circuit arrangement for overload protection of a drive motor Circuit arrangement for overload protection of a drive motor

1975-02-06

1976-08-10

Miller, J D

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

317 22, 318469, H02H 708

Patent

active

039744221

ABSTRACT:
The circuit arrangement is provided with a pickoff in the inhibitor cancelling means which activates the cancelling means only after the lapse of a predetermined time interval during an "on" start signal for a reversal of the motor. Once activated, the cancelling means deactivates the inhibitors which are used to prevent restarts of the motor in the same direction as before a switch-off caused by a motor-load-responsive measuring means.
The pickoff used may be a delay element which lengthens the first brief "on" signal after a stop for the predetermined minimum "on" time. Alternatively, the pickoff may be in the form of an integrator in which "on" signals shorter than the predetermined "on" time are summated. In this case, after summation of the discrete "on" times to the predetermined minimum "on" time, the integrator emits a signal to activate the cancelling means.

REFERENCES:
patent: 3075134 (1963-01-01), Manney
patent: 3513374 (1970-05-01), Koment
patent: 3611099 (1971-10-01), Kuroyama
patent: 3875487 (1975-04-01), White
patent: 3891909 (1975-06-01), Newson

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