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A new method to estimate the rotor position of permanent magnet synchronous motor (PMSM) drives over a wide speed range, including zero frequency is introduced. The method measures the motor current derivative in response to the standard pulse width modulation (PWM) sequence to estimate rotor position. No additional signal injection or separate test vectors are required although modification is needed...
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 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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