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This paper relates to a vibration analysis of brushless dc (BLDC) motors using the asymmetrical Z-axis overhang of permanent magnet (PM). In BLDC motor, the asymmetrical Z-axis overhang of PM generates Z-axis thrust, which leads to Z-axis eccentric force by commutated current on the rated load and then the Z-axis vibration. The Z-axis thrust ripple, which is the source of Z-axis vibration under commutated current, is analyzed by using 3-D finite element method, and the phenomena of Z-axis vibration are analyzed by experimentation.
Date of Publication: Sept.-Oct. 2008