TY - JFULL AU - E T. Rakgati and E. Matlotse PY - 2011/1/ TI - Novel Direct Flux and Torque Control of Optimally Designed 6 Phase Reluctance Machine with Special Current Waveform T2 - International Journal of Mechanical and Mechatronics Engineering SP - 2624 EP - 2631 VL - 5 SN - 1307-6892 UR - https://publications.waset.org/pdf/15810 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 60, 2011 N2 - In this paper the principle, basic torque theory and design optimisation of a six-phase reluctance dc machine are considered. A trapezoidal phase current waveform for the machine drive is proposed and evaluated to minimise ripple torque. Low cost normal laminated salient-pole rotors with and without slits and chamfered poles are investigated. The six-phase machine is optimised in multi-dimensions by linking the finite-element analysis method directly with an optimisation algorithm; the objective function is to maximise the torque per copper losses of the machine. The armature reaction effect is investigated in detail and found to be severe. The measured and calculated torque performances of a 35 kW optimum designed six-phase reluctance dc machine drive are presented. ER -