Circuit for detecting the failure of a step motor to respond to

Details Circuit for detecting the failure of a step motor to respond to Circuit for detecting the failure of a step motor to respond to

1984-06-25

1986-09-02

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

361 23, 361 31, G01R 3102

Patent

active

046098682

ABSTRACT:
A circuit for detecting the failure of a step motor to respond to energization commands, which takes advantage of the time constant decrease of an energized phase which occurs due to stalling of the motor. A predetermined current level I in the energized phase is reached in a time interval TI which is shorter than a time interval TO necessary to reach the same current level when there is a response of the motor. The circuit comprises a timer having a predetermined period between TI and TO which activates a bistable circuit indicative of a failure to respond if the current level I is reached in a time shorter than the required time period.

REFERENCES:
patent: 4107593 (1978-08-01), Anderson
patent: 4336486 (1982-06-01), Marinko
patent: 4358725 (1982-11-01), Brendemuehl
patent: 4477758 (1984-10-01), De Biasi

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