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This paper describes a sensorless position estimation method of a permanent magnet motor fed from a three-phase matrix converter using only its space vector PWM (SVPWM) sequence. The scheme employs measurements of the di/dt of the motor line currents to construct orthogonal ldquoresolver likerdquo position signals. In principle, the SVPWM waveforms provide sufficient excitation to extract the position...
This paper reports the implementation of a sensorless control scheme for AC machines that requires neither a model observer nor a test-signal. The model is based on saliency detection through the use of fundamental PWM excitation and the measurement of the derivatives of the line currents induced by the PWM voltage vectors. Derivation of the rotor position is possible at low and zero speeds without...
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 off-line pre-commissioning process. The method is based on a set of synchronous filters to identify the disturbance waveforms, and...
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