Abstract
This paper describes an instantaneous harmonic-reactive-power based IPM motor control system without a rotor position sensor and three techniques to improve its drive performance. The first technique is a harmonic-current injection control method using resonant regulators in a current control loop, which prevents the injected harmonic currents from being distorted mainly due to spatial harmonics of the motor. The second one is a method to compensate for coordinate transformation errors of the feedback currents and the voltage commands caused by a position estimation error. This method is effective to suppress a current oscillation as well as speed ripples that depend on the position estimation error. The last technique is devoted to compensation for the disturbance load torque, which utilizes acceleration information in the position estimator. Also, this paper presents performance of position control without any position sensors. In the paper, all techniques were examined with a DSP based fully digital prototype and effective performance improvements were confirmed through the tests.
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