| Abstract |
For high power industrial applications requiring high dynamic performance even far in the fieldweakening range, such as spindles used to coil up laminated steel sheets, the wound rotor asynchronous motor with both its stator and rotor fed by a frequency converter offers possibly an interesting solution. Due to the high flexibility of the DFAM (four degrees of freedom) flux, torque, slip and powerfactor of the motor can be controlled independently. And since in the case of wound rotors the rotorcurrents are observable, the computation of the fluxvector doesn't require the knowledge of the (highly temperature dependent) rotorresistance. This fact, and the better field distribution of the wound rotor induction motor as compared with cage induction motors, leads to a more precise open loop torque control. This paper describes the design of the vector controller for an induction motor fed by two IGBT PWM inverters. Results of computer simulations are included. |
