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This paper proposes a sensorless matrix-converter IPMSM drive system based on detecting the PWM switching-state current-ripples. By detecting the current-ripple of each PWM switching-state, the rotor position of the IPMSM can be estimated. As a result, the circuit of high-frequency sinusoidal voltage or current source is not required. A nonlinear controller is proposed here. The proposed nonlinear...
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