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This paper proposes a method for the efficiency optimization of ultrahigh-speed permanent-magnet machines. Analytical methods are applied for the modeling of the machine that is equipped with a diametrically magnetized rotor and a slotless stator. The outer dimensions of the machine are design constraints, and the internal dimensioning is optimized for(More)
A controller structure is proposed for the tracking of the rotor flux angle in a speed sensorless induction motor. The method is based on the fundamental-wave induction motor model that is augmented with the mechanical dynamics. A low-frequency current test signal is injected into the stator winding, and the response of the stator voltage is used to produce(More)
This paper deals with the flux estimation for induction motor drives. The equations for the parameter sensitivity of both the flux estimation and the torque production are derived for a full-order flux observer. Based on the parameter sensitivity analysis, a very simple method to determine a robust observer gain combining the current model and the voltage(More)