Fast computation of ripple torque for PM synchronous traction machines

Abstract

The document provides a way of calculation of approximate ripple torque for synchronous machines in various operating points. The traction machine taken as example is intended to power a vehicle. With such range of speed, the capability to calculate many operating points is important. The calculated ripple torque takes into account the cogging torque, the ripple torque due to open-circuit flux curve, and the effects of switching. The computation is very fast, even for a large number of operating points. The key points to ensure this fastness are emphasized. Matrix writing makes the computer code light and readable.