Phase current determining method for synchronous machine of drive system in e.g. motor vehicle, involves calculating phase voltage based on intermediate circuit voltage at input side of converter and based on control signal

摘要

The method involves implementing a current regulation using a current regulation unit (4) for generating a control signal (A) for a converter (3) based on information about an actual-phase current (i'a, i'b, i'c) in a multi-phase electrical machine and a predetermined reference-phase current (ia-soll, ib-soll, ic-soll). A phase voltage (ua, ub, uc) is calculated using a phase voltage-reconstruction unit (10) based on an intermediate circuit voltage (uzk') at an input side of the converter and based on the control signal. The actual-phase current is determined based on the phase voltage. Independent claims are also included for the following: (1) a device for determining phase current of a multi-phase electrical machine (2) a computer program product having instructions to perform a method for determining phase current of a multi-phase electrical machine.