Stalled motor thermal stopping control with preparation for reverse
阅读：980发布：2022-03-18
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1. ELECTRICAL ACTUATING APPARATUS COMPRISING A REVERSIBLE ELECTRIC MOTOR, A MEMBER DRIVABLE BY SAID MOTOR THROUGH A RANGE DETERMINED BY STOP MEANS WHICH MECHANICALLY PREVENT MOTION OF THE MEMBER BEYOND THE RANGE THEREBY TO STALL SAID MOTOR, CURRENT RESPONSIVE MEANS COMPRISING A BI-METAL ELEMENT CONNECTED IN SERIES WITH SAID MOTOR THROUGH NORMALLY CLOSED CONTACT MEANS FOR ENERGIZING SAID MOTOR, SAID BI-METAL ELEMENT BEING RESPONSIVE TO HEAT GENERATED IN IT FOR OPENING SAID CONTACT MEANS WHEN THE CURRENT PASSING THROUGH IT REACHES A SUSTAINED VALUE RESULTING FROM THE STALLING OF SAID MOTOR, WHEREBY WHEN SAID MOTOR IS STALLED AND THE CURRENT DRAWN BY SAID MOTOR REACHES SAID SUSTAINED VALUE SAID CURRENT RESPONSIVE MEANS CAUSES SAID CONTACT MEANS TO DE-ENERGIZE THE MOTOR AND CAUSES SAID CONTACT MEANS TO BE SET SO THAT UPON SUBSEQUENT ACTUATION THE MOTOR IS ENERGIZED IN THE OPPOSITE SENSE.
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