Inverter nonlinearities and discrete-time vector current control

This paper studies all-digital discrete-time vector current control loops containing a voltage fed invertor in series with a permanent-magnet synchronous motor. Normal operation of the typical pulse width modulating voltage fed inverter introduces nonlinear distortion into the voltage and the current waveforms of the motor. This paper focuses on both the causes and the attenuation of these disturbances using all-digital control. An effective, fully-digital current controller is developed and experimental results from a Motorola 68020 microprocessor based system are presented