Zero-torque eddy current motor system and method for controlling same
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United States of America Patent
Stats
-
May 15, 1990
Grant Date -
N/A
app pub date -
Jun 2, 1988
filing date -
Jun 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable speed eddy current electric motor includes a zero-torque regulating circuit that senses and responds to the current flowing through an eddy current motor field coil. As the magnitude of the field coil's current is changed by the eddy current motor's speed control circuit, the operating method of the zero-torque regulating circuit supplies varying amounts of current to flow through the field coil in a direction opposite to that of the current applied thereto by the speed control circuit. Thus, when the eddy current motor's speed control circuit no longer causes any current to flow through the field coil, the current supplied to the field coil by the zero-torque regulating circuit produces a magnetic filed that removes all torque from the eddy current motor's output shaft.
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