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It has been reported that the fundamental space vector PWM (SVPWM) waveforms of both a DC link voltage source inverter (VSI) and a matrix converter (MC) can be used as excitation signals for position estimation of a permanent magnet synchronous motor (PMSM). This paper evaluates the quality of the position estimates as well as the influence when the sensorless algorithm is implemented on a VSI and...
Two encoderless control methods for permanent magnet machines are compared for automotive applications. At low and zero speeds, model based methods cannot be utilised, and therefore a saliency tracking method is needed. A ldquod-axis injectionrdquo method and a ldquocurrent derivativerdquo method are evaluated in terms of quality of position signal and additional current distortion introduced. The...
A sensorless control system for a surface mounted permanent magnet (PM) machine is developed which uses measurement of motor current derivative during the fundamental PWM vector excitation only. Vector extension is required when the vector width falls below a minimum time duration. The extension is made to allow the high frequency switching oscillations due to parasitic capacitances in the drive to...
A method of detecting current using a single shunt resistor is required for motor-drive systems in home-electrical appliances to reduce the cost of inverters. This paper proposes a method of correcting the voltage reference vector by converting coordinates from a rotating reference frame into a fixed reference frame. It also proposes a new method of transforming coordinates that is appropriate for...
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