Title :
Open-circuit field distribution in a brushless motor with diametrically magnetised PM rotor, accounting for slotting and eddy current effects
Author :
Ng, K. ; Zhu, Z.Q. ; Howe, D.
Author_Institution :
Dept. of Electron. & Electr. Eng., Sheffield Univ., UK
fDate :
9/1/1996 12:00:00 AM
Abstract :
An analytical model has been developed for calculating the open-circuit time-varying magnetic field distribution in the airgap/magnet/retaining sleeve region of a brushless permanent magnet motor equipped with diametrically magnetised magnets. It accounts for the stator slotting and curvature, as well as for parasitic eddy currents induced in the retaining sleeve and magnets. The analytically predicted time-varying field distribution in the different regions is compared with corresponding finite element predictions
Keywords :
brushless machines; eddy currents; machine theory; magnetic fields; permanent magnet motors; rotors; airgap/magnet/retaining sleeve; analytical model; brushless motor; diametrically magnetised magnet; open-circuit time-varying magnetic field distribution; parasitic eddy current; permanent magnet rotor; stator curvature; stator slotting; Analytical models; Angular velocity; Boundary conditions; Brushless motors; Equations; Frequency; Magnetic flux; Magnetization; Permanent magnet motors; Rotors;
Journal_Title :
Magnetics, IEEE Transactions on
