Strategy and Application of Rotor Field Orientation Correction for Asynchronous Traction Motors in the Full Speed Domain
High power asynchronous traction systems typically use indirect vector control,where field orien-tation is easily affected by rotor resistance,and scalar control was used in the high-speed square wave re-gion.A segmented rotor field orientation correction method was proposed to address this issue.Compensating for slip frequency by observing electromagnetic torque differences in different coordinate systems in the non square wave region.The square wave region compensates for slip frequency based on q-axis current error.The flux observation adopted voltage model method with BPF,which could eliminate the DC bias and initial value error of the collected current.A method for rebuilding voltage through the amplitude of instruction volt-age in timer interrupts and the actual voltage angle in carrier interrupts was proposed based on the character-istics of the dual interrupt architecture in traction control systems,which improved the accuracy of voltage re-construction and was easy to implement in engineering.Finally,through simulation and experiments,it was verified that this method can achieve full speed domain correction for field orientation deviation caused by changes in rotor resistance.
asynchronous motorindirect vector controlflux observationfull speed domainrotor field o-rientation correction
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