METHOD FOR REDUCING THE TORQUE RIPPLE OF ELECTRONICALLY COMMUTATED ELECTRICAL MACHINES, DEVICE FOR DRIVING SUCH A MACHINE AND MOTOR VEHICLE

摘要

The invention relates to a method for reducing the torque ripple of an electronically commutated electrical machine, to a device (10) for driving an electronically commutated electrical machine and to a motor vehicle. The electrical machine (120) is driven in at least three phases using control voltages for the phases. The method comprises the following steps: estimating phase resistances using a recursive least squared error method and determining differences of the resistances from target phase resistances. The method is characterized in that control voltage differences for compensating the resistance differences are determined using the resistance differences. The amplitude of the second electrical order of the torque ripple is markedly reduced by the compensation scheme.