The development and testing of a scalar double-loop controller for a 3Φ WM inverter-fed IPM motor

This paper presents the development and performance testing of a scalar 2 loop decoupled resolution-level controlled (RLC) WM inverter-fed three-phase (3phi) interior permanent magnet (IPM) motor drive system. The proposed RLC WM inverter-fed IPM drive system is based on controlling the WM inverter output voltages using both a phase-shift thetas and the maximum value of the scale J. These two parameters are employed to adjust the output voltage of the used WM inverter in response to any change in the command speed and/or the motor load. The proposed control approach is designed so that one loop is to hold J constant for small changes in thetas in response to steady-state deviations in the motor speed, while the second loop is responsible for adjusting thetas to vary the WM inverter output voltages. This control approach can offer stable and effective responses to both steady-state and step changes over a wide range of motor operating speeds. The 2 loop RLC WM inverter-fed IPM drive system is realized for both simulation as well as experimental performance testing under different operating conditions. Simulation and experimental performance test results show effective responses to different changes in operating conditions of the tested drive.