Ohjauslaite ja menetelmä magneettisen kannatuksen ja momentinkehityksen ohjaamiseksi

摘要

An electrical drive comprises an electrical machine (103), a first converter stage (106) connected to terminals (107-109) of stator phase-windings of the electrical machine, and a second converter stage (113) connected to intermediate points (114-116) of the stator phase-windings. A control device (101) determines first component currents and second component currents so that torque is generated in accordance with electrical machine control and magnetic levitation force is di- rected to a rotor (105) of the electrical machine in accordance with levitation con- trol when portions of the phase-windings between the terminals and the intermedi- ate points carry both the first and second component currents and the other por- tions of the phase-windings carry the first component currents. The reference cur- rents for the first converter stage are determined based on the first and second component currents, and the reference currents for the second converter stage are determined based on the second component currents.