Optimal control and identification of model parameters of traction interior permanent magnet synchronous motor drive

This paper deals with a design of control of gearless wheel mounted drives of trams with interior permanent magnet synchronous motors (IPMSMs). The proposed control is based on a field oriented control linked to a rotor flux and optimally utilizes the reluctance component of torque in order to achieve maximum motor efficiency in entire speed range. For the optimal control, the stator inductances have to be known. Consequently, the three methods of their measurement were tried and compared. The first identifies motor inductances under steady-state conditions with freewheeling rotor. The second one has presented rotor locked rotor method technique which applies voltage pulses and the last one operates also with locked rotor, but a sinusoidal three-phase voltage source is used. The proposed drive control has been verified by experimental tests carried out on developed laboratory prototype of IPMSM.