| 摘要 |
The invention relates to a method in connection with an inverter, the inverter comprising a direct voltage intermediate circuit, an optimum switching table and output power switches. The method comprises steps where phase currents (i<SUB>A</SUB>, i<SUB>C</SUB>) of the inverter are converted to a synchronous dq coordinate system in order to achieve vector components (i<SUB>d</SUB>, i<SUB>q</SUB>), the synchronous current vector components (i<SUB>d</SUB>, i<SUB>q</SUB>) are low pass filtered in order to achieve current vector components (i<SUB>d,jpf</SUB>, i<SUB>q,jpf</SUB>), a current reference (i<SUB>q,ref</SUB>) is generated in the direction of the q axis, a current reference (i<SUB>d,ref</SUB>) is generated, a torque reference (t<SUB>e,ref</SUB>) is generated, an absolute value reference (|psi|<SUB>ref</SUB>) of a flux linkage is generated from the currents and switching commands are formed on the basis of the torque reference (t<SUB>e,ref</SUB>) and the flux reference (|psi|<SUB>ref</SUB>) using the optimum switching table ( 5 ). |
