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This study presents a simple model for a brushless DC (BLDC) motor drive operated directly from rectified mains without a DC link capacitor. A switching strategy with single switch control is adopted to regulate either the speed or torque. Operation of the drive during any switching state is similar to that of a buck converter and, thus, a buck converter based model is proposed to accurately predict...
A chattering-free robust nonlinear controller is proposed for the speed control of an IPMSM drive system to compensate for the parameter uncertainties and load disturbances. First, the input-output feedback linearization technique is used with a load torque estimator. Next, the upper bounds of the uncertainties are defined in design of the chattering-free robust controller. After that, in order to...
This paper proposes the design and implementation of adaptive controllers for a sensorless synchronous reluctance drive system with direct torque control. Two adaptive control algorithms, which include adaptive back-stepping control and model-reference adaptive control, are proposed to improve the performance of a sensorless direct-torque controlled synchronous reluctance motor drive system. A digital...
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