Abstract
The objective of this paper is to propose a novel tubular linear machine with hybrid permanent magnet arrays and multiple movers, which could be employed for either actuation or sensing technology. The hybrid magnet array produces flux distribution on both sides of windings, and thus helps to increase the signal strength in the windings. The multiple movers are important for airspace technology, because they can improve the system’s redundancy and reliability. The proposed design concept is presented, and the governing equations are obtained based on source free property and Maxwell equations. The magnetic field distribution in the linear machine is thus analytically formulated by using Bessel functions and harmonic expansion of magnetization vector. Numerical simulation is then conducted to validate the analytical solutions of the magnetic flux field. It is proved that the analytical model agrees with the numerical results well. Therefore, it can be utilized for the formulation of signal or force output subsequently, depending on its particular implementation.
Highlights
IntroductionLinear machine generates translations directly without rotation-to-transmission conversion mechanisms, and achieves compact structure, high efficiency and good dynamic performance
Linear machine generates translations directly without rotation-to-transmission conversion mechanisms, and achieves compact structure, high efficiency and good dynamic performance.It has wide applications in aerospace industries [1,2], transportation [3,4], high-precision manufacture [5,6], energy harvesting [7,8], robotics [9,10], and medical operations
The objective of this study is to propose one novel tubular linear machine with hybrid magnet arrays and multiple layers of windings
Summary
Linear machine generates translations directly without rotation-to-transmission conversion mechanisms, and achieves compact structure, high efficiency and good dynamic performance. Coils are configured in three phases to interact with the magnet and cause translation of the mover This structure and magnetization pattern help to increase flux density near the like pole regions. The Halbach array was firstly proposed a few decades ago [18], and implemented into design of linear machines recently [19] 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 [22,23] extended conventional magnet array into three-dimensional topology, and proposed the novel dual Halbach array It helps to improve the axial force output and depress the radial vibration. The combination of conventional Halbach array and alternatively magnetized radial poles helps to enhance the magnetic flux density in the radial direction, and increase the force output of the linear machine. Numerical computation is conducted to validate the analytical model and on the proposed design
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