| Abstract |
In this paper, the theory of operation of a new type of converter-fed synchronous machine drive is discussed first, which is capable of controlling the stator current waveforms to a shape which can be decided by the designer. Then, the Schwarz-Chirstoffel transformation (used in obtaining the Carter’s coefficient) is utilized to obtain the airgap permeance models of a six-phase design of the above machine drive types. The models are due to the stator slots effects with smooth rotor and vice versa. The machine drive was designed and built with a 225 frame and a slip-ring induction motor rotor in order to produce the stator current waveforms an approximate to sine-wave. A step by step computer program was developed to model the machine drive/system on PC. The simulated and practical results obtained are in a close agreement. |
