TY - JOUR
T1 - Field weakening for radial force reduction in brushless permanent-magnet DC motors
AU - Jiao, Guandong
AU - Rahn, Christopher D.
N1 - Funding Information:
Manuscript received September 9, 2002; revised June 7, 2004. This work was supported by the U.S. Office of Naval Research. G. Jiao is with the Department of Mechanical Engineering, Clemson University, Clemson, SC 29634 USA (e-mail: gjiao@clemson.edu). C. D. Rahn is with the Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802 USA (e-mail: cdrahn@psu.edu). Digital Object Identifier 10.1109/TMAG.2004.832989
PY - 2004/9
Y1 - 2004/9
N2 - In brushless permanent-magnet de (BLDC) machines, the attraction between the rotor permanent magnets and the stator iron causes radial stator forces that excite the stator structural response and radiate unwanted acoustic noise. In this paper, we develop an analytical model that predicts rotor torque and radial force ripple as functions of the stator currents. The model shows that field weakening of sinusoidally commutated BLDC machines can reduce radial forces but requires higher currents to maintain the desired torque. We confirmed the analytical results numerically on a BLDC motor using ANSYS finite-element analysis and found a 30% reduction in force ripple at no load.
AB - In brushless permanent-magnet de (BLDC) machines, the attraction between the rotor permanent magnets and the stator iron causes radial stator forces that excite the stator structural response and radiate unwanted acoustic noise. In this paper, we develop an analytical model that predicts rotor torque and radial force ripple as functions of the stator currents. The model shows that field weakening of sinusoidally commutated BLDC machines can reduce radial forces but requires higher currents to maintain the desired torque. We confirmed the analytical results numerically on a BLDC motor using ANSYS finite-element analysis and found a 30% reduction in force ripple at no load.
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U2 - 10.1109/TMAG.2004.832989
DO - 10.1109/TMAG.2004.832989
M3 - Article
AN - SCOPUS:4644361129
SN - 0018-9464
VL - 40
SP - 3286
EP - 3292
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 5
ER -