Method for reducing the starting current for a multi-phase machine operated with block commutation

摘要

The method involves controlling switches (S1-S10) e.g. power MOSFETs, by a drive schema to control current of a multiphase machine, for stepped adjustment of a block commutation angle, where the phase number of the multiphase machine is larger than 3. The drive schema having a series connection of phase windings (1-5) e.g. stator windings, is used as a function of an operating point. Rotation speed of a rotor of the machine is determined, and the current control is performed depending upon the rotational speed that is less than a predetermined threshold.