MINIMIZATION OF TORQUE RIPPLE
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United States of America Patent
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Issued Date -
Apr 21, 2016
app pub date -
Dec 15, 2015
filing date -
Aug 16, 2011
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Abstract
Systems and methods of operating an electric motor including a first linear actuator including a first coil, a second linear actuator including a second coil, a rotational shaft, a cam assembly mounted on said rotational shaft for translating linear movement of the first and second linear actuators to rotational movement of the rotational shaft. The first coil is driven with a first signal that produces a first radially-directed force. The second coil is simultaneously driven with a second signal that produces a second radially-directed force, wherein the first radially-directed force is represented by a sine function and the second radially-directed force is represented by the sine function phase shifted by ±π/2 radians.
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