ELECTRONICALLY COMMUTATED MOTOR

摘要

The invention relates to an electronically commutated motor having a stator carrying a plurality of winding strands and a rotor in which the individual winding strands are controlled via power amplifiers in staggered periods of time, the periods being subdivided into control time and idle time. In order to reduce the power loss in the power amplifiers and consequently to increase the efficiency specifically in the range of high currents, the invention provides that the control times are subdivided into an initial time segment and a final time segment-and that at low motor currents pulsing occurs only in the initial or final time segments in pulse width modulation, while at high currents complete switching through takes place in the initial time segments and additionally in the final time segment for a more or less long period of time or in the final time segments and additionally in the initial time segments for a more or less long period of time.