Patent ID: 6362582
Filing Date: 2002-03-26
Classification: H02P

Abstract:
An electronically commutated motor, comprising:a stator carrying winding strands; and a rotor in which individual winding strands are controlled via power amplifiers during staggered periods of time, the periods being divided into control time intervals and idle time intervals, the control time intervals being subdivided into initial time segments and final time segments in which time durations having low motor currents and high motor currents are differentiated by a threshold value, wherein, at the low motor currents, in the initial time segments, the power amplifiers are pulsed only via pulse width modulation, pulse widths lengthening with increasing low current, and, in the final time segments, the winding strands are disconnected from a supply of current, and wherein, at the high motor currents, in the initial time segments, the power amplifiers are completely switched through, and additionally, in the final time segments, the power amplifiers are completely switched through during closing time intervals, the closing time intervals lengthening with increasing high current.