Abstract
This paper presents the reduction method of torque ripple in position sensorless control at standstill/low-speed region of the wound-field synchronous motor with double three-phase wound stator for Integrated Starter Generator(ISG). High-frequency signal injection method which is commonly used for PMSMs is selected for the test motor's position sensorless control. Due to the injected signal, a large torque ripple is generated on the output torque. As our target machine, Wound-field Synchronous Motor with Double Three-phase Wound Stator, has two sets of three-phase windings, we proposed a method by injecting signal to the set of windings in the opposite sign to reduce the torque ripple. The proposed method can realize position sensorless control but also reduce the torque ripple significantly. The effectiveness of the proposed sensorless control method is shown by actual experiment.
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