Title :
Analytical Methods for Minimizing Detent Force in Long-Stator PM Linear Motor Including Longitudinal End Effects
Author :
Mingna Ma ; Liyi Li ; Jiangpeng Zhang ; Jikun Yu ; He Zhang ; Yinxi Jin
Author_Institution :
Sch. of Electr. Eng. & Autom., Hefei Univ. of Technol., Hefei, China
Abstract :
The detent force in long-stator linear motor is caused by open longitudinal ends of permanent magnet mover, which differs from rotary motor and short-armature counterparts. First, the modeling of end magnetic field is established, and then the nonuniformity of magnetic field between edge and middle magnets is analyzed. Based on the corrected factors of air-gap magnetic field calculation, a general mathematical expression of the detent force by energy method and Fourier transform is developed. Finally, a novel method by unequal pole-arc coefficients of edge and middle magnets is proposed, and the optimized pole-arc coefficients combinations are obtained. The effectiveness of the proposed method is verified by finite-element results.
Keywords :
Fourier transforms; finite element analysis; linear motors; machine insulation; machine theory; magnetic fields; permanent magnet motors; stators; Fourier transform; air-gap magnetic field calculation; analytical methods; detent force minimization; edge magnets; end magnetic field; finite element results; long-stator PM linear motor; longitudinal end effects; middle magnets; permanent magnet mover; rotary motor; short-armature counterparts; unequal pole-arc coefficients; Analytical models; Force; Magnetic fields; Magnetic flux; Permanent magnet motors; Permanent magnets; Synchronous motors; Detent force; Linear motor; detent force; linear motor; longitudinal end effects; pole-arc coefficients;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2436704
