Vector control of an induction motor

• Main Authors: Tarkiainen, Antti, Pöllänen, Riku
• Format: Patent
• Language: English
• Published: 18.10.2005

ACdqdqd,jpfq,jpfq,refd,refe,refrefe,refrefThe 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, i) of the inverter are converted to a synchronous dq coordinate system in order to achieve vector components (i, i), the synchronous current vector components (i, i) are low pass filtered in order to achieve current vector components (i, i), a current reference (i) is generated in the direction of the q axis, a current reference (i) is generated, a torque reference (t) is generated, an absolute value reference (|ψ|) of a flux linkage is generated from the currents and switching commands are formed on the basis of the torque reference (t) and the flux reference (|ψ|) using the optimum switching table.