Permanent-Magnet A.C. and D.C. Machines
Design analysis procedures have been developed and validated for permanent-magnet synchronous motors. The potential for exploitation of the properties of Nd-Fe-B is demonstrated by design, construction and evaluation of alternative SmCo5 and Nd-Fe-B rotors in a 7.5 kW machine, showing the performance advantages of the latter material.
The high-field properties of Nd-Fe-B raises the feasibility of slotless-stator brushless d.c. machines. Design approaches to the effective utilisation of magnets in such machines are developed and verified by construction and testing of an experimental machine. This is shown to yield an advantageous reduction of torque pulsation.
Problems of large permanent-magnet machines have been approached by study of new methods of in-situ magnetisation. Results obtained from an experimental magnetiser are reported, with a view to their application in production of a prototype 200kW motor.
KeywordsInduction Motor Electrical Machine Rotor Position Experimental Machine Torque Ripple
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