Disengageable one-way mechanism for synchronous motors
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United States of America Patent
Stats
-
Dec 29, 1987
Grant Date -
N/A
app pub date -
Nov 6, 1986
filing date -
Nov 6, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mechanism prevents the start-up of a synchronous a.c. motor in other than a desired direction. The mechanism includes a flexible arm having a finger that will engage a radially projecting abutment on the motor shaft. The finger blocks rotation of the shaft in a first direction and slides over the abutment when the shaft rotates in the opposite direction. A solenoid moves the arm and finger out of the path of the abutment shortly after the motor is energized, to allow the shaft to rotate in the first direction if the motor encounters an overload. Alternately, the arm may be formed of a bi-metal which is differentially heated by electrical current following motor energization to move the arm out of the path of the abutment.
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