A new kind of magnetic elevator is presented in this paper, and the traction force of elevator is provided by the double long-primary short-secondary linear induction motor. The elevator has the advantages of simple structure, less heat, good adaptability. The circuit model of traction motor is established. Magnetic elevator running speed curve is analyzed, and the VVVF control system of linear induction motor for magnetic elevator is designed, and the double long-stator windings are piecewise controlled. Through simulation, the feasibility of the magnetic elevator is verified. The paper laid the solid foundation for the further application.
A non-uniform rational B-spline (NURBS) parametric curve interpolation and S-shape acceleration/deceleration (ACC/DEC) for CNC machine tool were studied. In the proposed algorithm, the commanded velocity is maintained at most of the time and adaptively reduced in large curvature areas to meet the demand of the machining accuracy requirement, while at the same time, a S-shape look ahead algorithm is proposed to limit the acceleration and jerk values within the machine’s capabilities during the whole interpolation process. It reduces mechanical shock to the machine tools. The real time performance of this interpolator is also measured to demonstrate its practical application. A NURBS curve interpolation experiments is provided to verify the feasibility and advantages of the proposed algorithm.
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