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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...
The paper introduces a new scheme to track the rotor position of an induction motor. The scheme uses the measurement of current derivatives during null switching vectors of a standard PWM scheme and reduces the minimum pulse widths required to allow high frequency switching oscillations to die down. The motor current distortion is therefore also reduced. The method uses H-Bridges connected in series...
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