High-frequency modeling, parameterization, and simulation of IPM motor drive systems

Interior-permanent-magnet (IPM) motor drive systems are widely used in industrial applications. As power transistors are made faster, it is important to establish accurate high-frequency (HF) models of IPM motor drive systems so that transient overvoltages, electromagnetic interference (EMI), and motor/converter losses can be predicted more accurately to facilitate system design and verification. In this paper, a HF IPM motor model is proposed. A conventional qd0 IPM motor model is augmented to portray the HF transients. The motor model is parameterized using measured differential-mode (DM) and common-mode (CM) impedance characteristics. In addition, a HF cable model is proposed whose parameters can be established from DM and CM impedance measurements under short- and open-circuit conditions. An αβ0 model is used to implement the cable model in simulation. Both models can readily be implemented using circuit-based simulators, such as LTspice, so that established SPICE transistor models can be used to predict switching transients, EMI and losses.