Analysis of indirect temperature-rise tests of induction machines using time stepping finite element method

To be able to test the temperature-rise of induction motors with indirect loading is very useful for the motor industry. In this paper different indirect loading schemes including two-frequency method, phantom loading and inverter driven method, are surveyed. Their merits and demerits are pointed out. A universal method which can analyse all of these indirect temperature-rise methods is presented. The analysis is based on the time stepping finite element model of skewed rotor bar induction machines and the solution can directly include the effects of saturation, eddy-current and high-order harmonic fields