Motor stopped verification sensor
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United States of America Patent
Stats
-
May 18, 1999
Grant Date -
N/A
app pub date -
May 9, 1997
filing date -
Sep 12, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a sensor for verifying that a motor has stopped rotating including rotation due to inertia. Respective signal input lines are connected to three power supply lines of a three phase AC motor. A high frequency signal current is supplied to one of the power supply lines, and the difference in the current flowing in the other two power supply lines is sampled from the signal input lines connected to the two power supply lines, and made an output from a sensor section. The sensor output is subjected to a threshold value operation in a signal processing circuit, and the resultant threshold operation output is output from an on-delay circuit as a motor rotation presence judgment output.
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