Design and Analysis of Tubular Linear Machines with Dual Halbach Arrays

Abstract

Linear machines are widely employed in robotics, transportation and manufacturing industries because complex rotation-to-translation conversion mechanism is no longer required. This paper proposed a novel tubular linear machine with dual permanent magnet (PM) Halbach arrays to achieve high force output performance. Based on Lorentz force law, the magnetic force output and force ripple for three-phase winding linear machine is formulated in analytical way. By taking advantage of the analytical models, the force output is simulated with respect to the motion of the mover. Numerical result is then obtained to validate the analytical force models. In addition, based on the technology of non-dimensionalization, the mathematical force models are employed to analyze the influence among the structure parameters on the force output and force ripple for design purpose of the tubular linear machines. The study in this paper could contribute to the design analysis and optimization of electromagnetic linear machines with similar poles patterns.

Magnetic field modeling of a linear permanent magnet motor with two isolated movers

“…There are many researchers and institutions study modelling of PM linear machines [18,19]. The flux density distribution can be assumed as uniform due to the air gap is small.…”

Design and analysis of an improved Halbach tubular linear motor with non-ferromagnetic mover tube for direct-driven EHA

“…However, special shaped magnets are difficult to fabricate and magnetizing, making this design unavailable in practice. We have also conducted innovative attempts such as dual Halbach array [14][15][16], which lays the foundation of this work.…”