Analysis of hunting in Synchronous Hysteresis Motor
Author(s)Truong, Cang Kim, 1979-
Analysis and control of hunting in Synchronous Hysteresis Motor
Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
Jonathan Cole and James Kirtley.
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The Synchronous Hysteresis Motor has an inherent instability when it is used to drive a gyroscope wheel. The motor ideally should spin at a constant angular velocity, but it instead sporadically oscillates about synchronous speed. This phenomenon is known as 'hunting'. This problem produces current ripples at the motor's electrical terminals and induces noise on the sensors that monitor gyro activity. This thesis examines the cause of hunting by deriving the motor's torque characteristics from first principles. It also derives a scheme for suppressing hunting by monitoring the motor's current as an indicator of drag angle and using it to modulate the motor's drive frequency. Explanation of the circuit that successfully implements this scheme is included and lab results are shown to verify the working theory.
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (leaf 86).
DepartmentMassachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology
Electrical Engineering and Computer Science.