| Abstract |
In this paper synchronous reluctance machine topologies are investigated regarding power and efficiency for a low power industrial drive. Starting from an existing standard induction motor two rotor types, flux barrier and salient pole, were designed for a wide speed range of the electric drive. By adaptation of the stator winding the drive requirements are met for both topologies. In this work the focus is set to the behavior in the flux weakening region for utilizing a high power capability and high efficiency in an application. Both rotor types are analyzed by finite element methods and show different characteristics. The salient pole machine is able to provide a power at maximum speed more than two times higher than the flux barrier type and shows a much broader constant power speed range. Further, because of nearly constant machine saliency, the part load efficiency of the salient pole rotor is higher, although the flux barrier machine has a higher efficiency at maximum torque. Experimental results are presented and confirm the higher torque per ampere characteristic of the salient pole machine because of its lower quadrature axis inductance. The torque vs. speed limit during flux weakening shows the higher performance of the salient pole rotor. Thus, in this application at driving cycles with major operation time at high speeds the salient pole rotor is preferred. |
