The Torus machine is a double-sided, axial-flux, disc-type,permanent-magnet, brushless machine which may be operated as either agenerator or a motor. Its particularly short axial length and goodpower-to-weight ratio is being exploited in a number of generatorapplications and there is now fairly widespread activity in the study ofthis machine topology both as generator and as a motor. As the Torusmachine is equipped with single or double layer, full pitch uniformlydistributed windings its open circuit EMFs are far from sinusoidal.During these studies it was recognised that torque per ampere could beincreased by matching the current waveshape to that of the trapezoidalEMF, adopting the principle of instantaneous current regulation whichhas been successfully exploited in field-oriented control of inductionmachines. An investigation of improved methods of current regulation isreported based upon a 2.5 kW, 24 V, 9-phase machine previously developedas a generator
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