By Topic

Experimental Measurement and Simulated Verification of the Unbalanced Magnetic Force in Brushless DC Motors

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Lee, C.I. ; Dept. of Mech. Eng., Hanyang Univ., Seoul ; Jang, G.H.

This paper investigates the characteristics of the unbalanced magnetic force (UMF) of a brushless dc (BLDC) motor due to uneven magnetization of a permanent magnet (PM), rotor eccentricity, stator eccentricity, and interactions between these factors. An experimental device is developed to measure the UMF of an electric motor directly. Finite-element analysis is performed to compare experimental and simulated results. The characteristics of the measured UMF match those of the simulated one. The UMF always exists in the symmetric design of pole, slot and winding of BLDC motors if there are manufacturing or operating errors such as uneven magnetization of the PM, or rotor and stator eccentricities. This research shows that the driving frequencies of the UMF due to uneven magnetization of the PM are the first harmonic and the harmonics of slot number plusmn 1. It also shows that rotor and stator eccentricities mainly generate the first harmonic and the harmonics of the pole number, respectively.

Published in:

Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 11 )