Magnetic field-electric circuit coupled method for brush DC motor simulations

Micro-hybrid or “stop-start” developments for automotive applications are continuously growing due to recent European regulations on emissions and pollution. A reinforced starter is able to ensure this new function in addition to the classical cold start. Such devices must be optimized, especially their process of commutation in order to minimize commutator and brush wears and keep the device running during the whole life of the vehicle. The starter performances are computed with the help of a FE model, coupled with circuit equation. Brush/segment contact resistance introduced in the circuit model has been measured and computed. An electrical arc model has also been developed and used in the model. Losses in sliding contact, and also during arcing contact, and other internal variable can thus be determined.