Evaluation of an efficiency-optimized calculation of PM synchronous machines' operating range using time-saving numerical and analytical coupling

Abstract

In this paper, a new method for an accurate and also time-saving calculation of permanent magnet synchronous machines is presented. The method is based on a coupled numerical-analytical approach. The aim is to determine efficiency optimized torque-speed characteristics of the drive system. The novel approach considers all kinds of losses, such as switching and conduction losses of the inverter, copper losses, friction losses as well as saturation-dependent hysteresis and eddy current losses of the electrical machine. The presented approach is verified by measurements of a high-torque wheel hub drive

Fault tolerant wheel hub drive with integrated converter for electric vehicle applications

“…Thus, the thermal resistance of the winding is 0.063 KlW and the predicted constant torque at ISO°C winding temperature is 6S0 Nm. A detailed investigation of the motor efficiency with a measured efficiency map and a description of the ditlerent loss mechanisms in the wheel hub motor is given in [12]. The thermal behaviour of the drive system and a coupled thermal-electromagnetic model for the energy consumption of an electric vehicle using the presented wheel hub drive is described in [13].…”

Low voltage and high power DC-AC inverter topologies for electric vehicles

“…The entire look-up table of this machine is implemented in MATLAB as a library. Therefore, the working point data of the electric machine is available for precise loss calculation of the entire traction system for the given driving cycle [11].…”