Title :
Design considerations of a direct drive brushless PM machine with concentrated windings
Author :
Wrobel, R. ; Mellor, P.H.
Author_Institution :
Dept. of Electr. & Electron. Eng., Bristol Univ.
Abstract :
The paper considers the optimal design of an open slot, external rotor torque motor. Combinations of pole and slot numbers are presented for which the winding factor is maximal and torque ripple is minimal. A detailed optimisation of the magnetic circuit design of the six most promising pole-slot configurations has been undertaken using the combination of a genetic algorithm (GA) and a parametric finite element model. These candidate motor versions are characterised by the same total slot area available for the winding and by equal volumes of permanent magnet. An alternative two-segment Halbach arrangement of the rotor permanent magnets is also proposed to further increase the volumetric torque density
Keywords :
brushless machines; design engineering; finite element analysis; genetic algorithms; magnetic circuits; motor drives; permanent magnet machines; rotors; torque; concentrated windings; direct drive brushless PM machine; finite element model; genetic algorithm; magnetic circuit design; pole-slot configurations; rotor permanent magnets; rotor torque motor; two-segment Halbach arrangement; volumetric torque density; Algorithm design and analysis; Design optimization; Finite element methods; Genetic algorithms; Machine windings; Magnetic circuits; Permanent magnet motors; Permanent magnets; Rotors; Torque;
Conference_Titel :
Electric Machines and Drives, 2005 IEEE International Conference on
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-8987-5
Electronic_ISBN :
0-7803-8988-3
DOI :
10.1109/IEMDC.2005.195793
