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Electromagnetic limited-angle torque motors (LATMs) which have a limited angular movement less than 180 degrees are widely applied in industry, particularly for positioning tasks. Compared with common rotating motors, LATMs have many advantages such as simple structure, high reliability, and uncomplicated control mode. In general, radial-flux permanent-magnet LATMs have two conventional types which...
The drive system of induction motor is a complex nonlinear system. Several studies have been performed on the saddle-note bifurcation of induction motor ignoring iron loss. However, little work has been done on the system with iron loss. In this paper, we will analyze this problem with Lyapunov stability theory. By the analysis and simulation verification, the following conclusions are obtained: The...
Since the magnetic anisotropy of ferromagnetic (FM) films on semiconductor substrates has promising application for spintronics, it has stimulated extensive studies in the last two decades [1]. Remarkably, amorphous FM alloy films also exhibit uniaxial magnetic anisotropy (UMA) in the film plane when deposited on semiconductor substrates, e.g. CoFeB/GaAs (001) [2]. Although several models, including...
For bulk HTS rotating machines, enhancement of the trapped flux is a crucial task to achieve practical applications with high torque density. The increase of critical current density Jc using artificial pinning centers is an efficient technique for the enhancement of the flux trapping properties. We attempted to enhance both Jc and the trapped flux in bulk HTS with magnetic/ferromagnetic particles...
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