Driving Performance of a Two-Dimensional Homopolar Linear DC Motor

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  • Driving Performance of a Two-DimensionaI Homopolar Linear DC Motor
  • DrivingPerformanceofaTwo-DimensionaIHom

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Abstract

This paper presents a novel two-dimensional homopolar linear dc motor (LDM) which can realize two-dimensional (2-D) motion. For position control purposes, two kinds of position detecting methods are proposed. The position in one position is detected by means of a capacitive sensor which makes the output of the sensor partially immune to the variation of the gap between electrodes. The position in the other direction is achieved by exploiting the position dependent property of the driving coil inductance, instead of using an independent sensor. The position control is implemented on the motor and 2-D tracking performance is analyzed. Experiments show that the motor demonstrates satisfactory driving performance, 2-D tracking error being within 5.5% when the angular frequency of reference signal is 3.14rad./s.

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