A Low-Order Lumped Parameter Thermal Network of Electrically Excited Synchronous Motor for Critical Temperature Estimation
Eryang Wang, Philip Grabherr, Peter Wieske, Martin Doppelbauer
Abstract
With a low-order lumped parameter thermal network, online model-based thermal condition monitoring of the electrical machines can be achieved. In this paper, a topology of the thermal network for an electrically excited synchronous motor is presented. The relationships and differences between the electrically excited synchronous motor and the permanent magnet synchronous motor in terms of the low-order thermal network are discussed. For parameter identification, a concept is proposed, in which thermal resistances and capacities are identified separately. With a prototype of the electrically excited synchronous motor on the test bench, the thermal network is validated with different thermal duty cycles to ensure accuracy.