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

Abstract

Direct-driven Electrical Hydrostatic Actuator (D-EHA) is a novel actuator for large aircraft Power-By-Wire (PBW) system. Achieving high dynamic response is an important task for D-EHA. In this paper, a tubular oscillating motor with improved Halbach array and non-ferromagnetic mover tube is proposed for high-dynamic system. Its structure and operating principle is first clarified. Then, focusing on the novel magnet array, analytical modelling is put forward and validated by FEM simulation. Comparisons with common used quasi-Halbach design over flux distribution, flux density and thrust are conducted. The results indicate that this novel magnet design has superior thrust and dynamic performance over traditional ones, especially for oscillating motor with relatively small stroke.

Magnetic Flux Distribution of Linear Machines with Novel Three-Dimensional Hybrid Magnet Arrays

“…It can enhance the flux density on the one side of PM, and reduce the flux leakage on the other side in a certain degree. Yan et al [ 20 ] proposed a high dynamic performance linear machine with improved Halbach array. A combination of two axial magnets and one radial magnet is utilized in the design of magnet topology.…”