An application of the induction motor speed sensor less control to railway vehicle traction system

For railway vehicle traction purpose, slip frequency of induction traction motors are controlled with detecting rotor frequency by pulse generators or PGs as the speed sensors. Applying the speed sensor less control method to the railway vehicle traction to eliminate the PGs, we expect to improve cost efficiency and reliability of the traction control system. Though speed sensor-less control methods are popular in general industrial application purpose, some novel control functions may be added and its compatibility is verified to cope with the problem particular in railway vehicle traction application. In this paper, we present the result of the application to railway vehicle traction control with theoretical study and tests.