Title :
Rotor Eddy Current Loss in Single-Phase Permanent Magnet Brushless DC Motor
Author :
Zhu, Z.Q. ; Chen, Y. ; Howe, D. ; Gliemann, J.H.
Author_Institution :
Univ. of Sheffield, Sheffield
Abstract :
Due to spatial harmonics in the pulsating stator mmf and temporal harmonics in the excitation current, a significant eddy current loss may be induced in the rotor of a single-phase permanent magnet brushless dc (BLDC) motor. The eddy current loss is also dependent on the level of airgap asymmetry which is employed to facilitate unidirectional rotation. The paper investigates the eddy current loss which results in the permanent magnets and retaining sleeve of a 1.1 kW, 45 krpm, single-phase BLDC motor, and considers the influence of the phase current waveform and the level of airgap asymmetry, as well as the effectiveness of segmenting the magnets in reducing the loss.
Keywords :
brushless DC motors; eddy current losses; harmonics; permanent magnet motors; stators; airgap asymmetry; excitation current; phase current waveform; power 1.1 kW; pulsating stator mmf; rotor eddy current loss; single-phase permanent magnet brushless dc motor; spatial harmonics; temporal harmonics; unidirectional rotation; Brushless DC motors; Brushless motors; DC motors; Eddy currents; Magnetic losses; Permanent magnet motors; Rotors; Stators; Torque measurement; Velocity measurement;
Conference_Titel :
Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-1259-4
Electronic_ISBN :
0197-2618
DOI :
10.1109/07IAS.2007.87
