Title :
Special Losses in Rotors of Electronically Commutated Brushless DC Motors Induced by Non-Uniformly Rotating Amature MMFS
Author :
Nagarkatti, A.K. ; Mohammed, O.A. ; Demerdash, N.A.
Author_Institution :
Virginia Polytechnic Institute and State University
Abstract :
This paper analyzes special eddy current losses induced in the rotor of an electronically commutated permanent magnet motor powered from a d.c. source, on account of the non-uniform rotation of the stator field. Formulas are established for the losses induced by the tangential component of the stator magnetic field. These formulas are applied to a specific motor design where the magnet retainment was accomplished by means of a metallic nonmagnetic stainless steel sleeve surrounding the rotor structure. The resulting losses are given with consequent conclusions.
Keywords :
Brushless DC motors; Commutation; DC motors; Eddy currents; Magnetic analysis; Magnetic fields; Permanent magnet motors; Rotors; Stators; Steel;
Journal_Title :
Power Apparatus and Systems, IEEE Transactions on
DOI :
10.1109/TPAS.1982.317302