A new loss minimization control of interior permanent magnet motor drives operating with a wavelet based speed controller

The paper presents a new loss minimization control for interior permanent magnet (IPM) motor drives. A wavelet-based speed controller is integrated with the loss minimization control. The loss minimization control in addition to the maximum torque per ampere control provides minimum input power for IPM motor drives. The proposed loss minimization control regulates the command flux current at its optimum point to ensure minimum electrical losses of the IPM drive system. The wavelet-based speed controller provides the command torque current for the drive system. A wavelet based de-noising technique is used inside the speed controller in order to minimize the torque ripple, which reduces the iron losses of the motor. The IPM motor drive with the loss minimization control and the wavelet-based speed controller is modeled in the m-file script of MATLAB software. The speed response and the power consumption of the complete drive system are investigated for speed and torque variations. The performances of the loss minimization control with the wavelet-based speed controller are compared with the loss minimization control operating with the PID speed controller. The drive system with the wavelet speed controller shows more efficient and more robust performances than the PID speed controller based IPM drive system.