Title :
Unbalanced Magnetic Pull in Fractional-Slot Brushless PM Motors
Author :
Dorrell, David G. ; Popescu, Mircea ; Cossar, Calum ; Ionel, Dan
Author_Institution :
Dept of Electron. & Electr. Eng., Glasgow Univ., Glasgow
Abstract :
This paper reports on an investigation into the unbalanced magnetic pull in brushless PM motors due to either magnetic asymmetry or rotor eccentricity. Several machines are investigated. These have different slot and pole number combinations. Some of the windings contain sub-harmonics and these are found to be more susceptible to UMP when there is rotor eccentricity and also to produce vibrating UMP. Consequent rotor poles are also found to produce high UMP under rotor eccentricity conditions.
Keywords :
brushless DC motors; machine windings; permanent magnet motors; rotors; brushless PM motors; fractional-slot motors; magnetic asymmetry; permanent magnet motors; rotor eccentricity; rotor poles; unbalanced magnetic pull; Air gaps; Analytical models; Brushless motors; Frequency; Machine windings; Magnetic analysis; Magnetic flux; Permanent magnet motors; Rotors; Synchronous motors;
Conference_Titel :
Industry Applications Society Annual Meeting, 2008. IAS '08. IEEE
Conference_Location :
Edmonton, Alta.
Print_ISBN :
978-1-4244-2278-4
Electronic_ISBN :
0197-2618
DOI :
10.1109/08IAS.2008.63
