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A novel dual Halbach array is proposed in this paper to increase the output performance of tubular linear machines. The magnetic field distribution in three-dimensional (3D) space is formulated with Bessel functions analytically. Following that, the modeling of force output for linear machines with three-phase windings is carried out based on Lorentz force law. The formula component of force ripple...
As electro-mechanical energy conversion interface of electro-hydraulic control valve, the electro-mechanical converter has a crucial influence on the performance of valve itself and thus the whole electro-hydraulic control system. In this paper the mathematical model of electro-mechanical converter using stepping motor was established and its frequency characteristic with voltage control and current...
A new method used in error and VI characteristics measurement of current transformer is developed based on the equivalent model of current transformer. Using this method, the up-flow unit and the standard current transformer are not necessary. And more characteristics of current transformer can be inferred. The current transformer calibrator developed based on this method can carry out rapid and precise...
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