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This paper addresses the position sensorless control for brushless DC motor (BDCM) with repetitive position-dependent load torque which is a function of the absolute rotor position (not incremental rotor position). The robust sensorless control is composed of sensorless control and robust speed control. In order to commutate winding currents, the former one estimates the incremental rotor positions...
This paper deals with induction machines analysis by finite element analysis (FEA) for position sensorless control drives based on rotating voltage carrier injection. In details, it focuses the analysis of the supply conditions of the machine, both the high frequency rotating voltage carrier and the fundamental frequency supply, for the optimal detection of the rotor slotting saliency effects. With...
Sensorless control of ac machines which is able to work even at zero speed can be realized using high frequency excitation. Different schemes have been presented recently, which use transient excitation caused by the switching of the voltage source inverter. Transient excitations of only one pair of test vectors are applied for each measurement in this paper. The signals resulting from transient excitation...
This paper addresses the sensorless speed and position control of induction motors using high-frequency injection at zero and low frequencies. A novel algorithm is presented which allows the rejection of saturation and nonlinear inverter effects without the need for an offline precommissioning process. The method is based on a set of synchronous filters to identify the disturbance waveforms and a...
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