Arc reduction of high-voltage DC-motor for automotive application by targetwise parameter optimization (TPO)

The aim of this work is to determine the optimal design parameter for reduced arc characteristics of the high-voltage direct current (dc) motor due to the increase of the terminal voltage from 14 to 42 V. The main interesting focus is whether the reactance voltage decreases according to kinds of the brush, the magnet and the electroangle of the stator magnet. To limit the coil inductance, the electrographite instead of the metal graphite is applied to the electromagnetic design for the 42-V dc motor as automotive application. Supposing the law of energy conservation during the commutation period, the resistivity of the eletrographite with high value makes the inductance of the rotor coil with low value. As a result, the arc appearance decreases remarkably. It is applicable to the automotive application such as cooling fan for engine with the continuous high current of the 42-V power net. As an extra approach, the elecromagnetic design is optimized with the same models to make low coil inductance upon similar required load. Finally, we verify the appearance of the arc reduction through comparing a few photographs, which show how these approaches play a role as a bridge from 14 to 42 V. Index Terms--Automotive, arc reduction, direct current (dc) motor, targetwise parameter optimization (TPO), 42 V.