Sensorless Speed Control for DC Permanent Magnetic Motors

W. Zhan (USA)


Pulse Width Modulation, motor speed control, modeling and simulation


DC permanent magnetic motors are widely used in industry for their high reliability and low cost. The accuracy of motor speed control is a key issue. It is desirable that the motor speed be controlled within a given band under various known or unknown disturbances. Cost associated with the sensors that directly or indirectly measure the motor speed makes many existing control designs not production viable. In this paper, we study the challenging task of controlling the speed of sensorless DC permanent magnetic motors. The feasibility of such controller design is evaluated by simulation in the Matlab/Simulink environment first. Different type of controllers are analyzed and compared. The new controller, Closed Loop Speed Control, is tested in an ABS system and shown to be as good as a controller with a position sensor.

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