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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...
Permanent magnet (PM) array has great influence on flux field distribution of motor. A Halbach PM array is used in the motor of this paper, which not only increases the thrust output, but also decreases the mover mass. A new analytical model for magnetic flux density in circumferential direction is proposed in this paper based on equivalent surface current method, which could solve the flux density...
Ferromagnetic material affects the magnetic field of electromagnetic actuators significantly. This paper studies the effect of back iron on magnetic field of linear motors. Designs of linear motors with single-sided, double-sided, and without back irons are analyzed quantitatively. The magnetic field for different structures is formulated analytically based on magnetic vector potential. The simulation...
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