Direct Flux Control of PM Synchronous Motor Drives for Traction Applications

Three Permanent Magnet traction motors are controlled via a unified Direct Flux Vector Control scheme. Two of the motors have the same stator with concentrated windings, one combined with a Surface Mounted PM rotor and the other with an Interior PM rotor. The third motor is a PM-assisted Synchronous Reluctance motor with distributed windings. The algorithm has a predictive nature and no regulators that need to be tuned. When switching from one motor to another, the set of motor parameters is changed and nothing else. The key parameters are the stator resistance and the dq flux linkage curves. Drive commissioning issues are addressed along with the effects of parameter errors on the control performance, and both are quite acceptable for traction applications. Experimental results are provided for all three motors.