Design and Experimental Validation of Performance for a Maglev Moving-Magnet-Type Synchronous PM Planar Motor

Abstract

IntroductionAmong the planar actuators, the SPMPM has the advantages such as no heating problem, high power conversion ratio, and so on. However, conventional moving-coil type SPMPMs are shown to have the limits to expend their working range since they have power cables in the mover. In addition, x-and ydirection motions are coupled each other [1]. In this paper, we propose a novel Maglev moving-magnet-type SPMPM that has a simple and thin stator composed of several PCBs. In order to study the feasibility of the proposed SPMPM, the magnetic flux density and thrust force equations are estimated analytically and verified using the finite-element method (FEM) and experimental works Design and Analysis Fig. 1(a) and 1(b) show the side view of analytical model and the upper view of the stator respectively. The three-phase PWM method is used to supply the power source into the prototype motor fed by an IGBT inverter, using the standard vector control for normal brushless PM DC servo-motors. Distribution equations of the electromagnetic systems can be expressed using Maxwell's equations and Ohm's law, and governing equation of the electromagnetic systems is expressed as the partial differential equations for the magnetic vector potential A. From the boundary conditions of the system, the z-direction flux density distribution in the air gap is calculated. The intensity of propulsion planar force depends on the values of the current density of the stator windings and the flux density established by PMs. Experimental Validations Fig. 2 shows the structure of the proposed SPMPM, which has the dimensions and parameters given in Table I. Fig. 3(a) and 3(b) show the analytical and 3-D FEM results of the z-direction flux density distribution respectively. Fig. 4 shows the comparison results between the analytical and experimental values for the propulsion force. Table II presents the values of the x-direction thrust force corresponding to the phase currents by means of the analytical, FEM, and experimental method. The measured values of thrust force are smaller than the analytical results because some parameters are neglected to simplify the modeling

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“…The relationships between THD and τ can be calculated by (5) and (6). Figure 5 shows their relationships in x-(y-) direction and in z-direction.…”

“…Usually permanent-magnet synchronous planar motors have either moving magnets and stationary coils, or moving coils and stationary magnets. The mover of planar motor is controlled in six degrees of freedom and magnetically levitated by the Lorentz force generated between the mover and stator [6].…”

Modeling of Maglev Yaw System of Wind Turbines and its Robust Trajectory Tracking Control in the Levitating and Landing Process Based on Ndob

“…The H∞ control method was applied to the maglev system [16], and the system robustness on the change of air gap or the mass of suspension electromagnet was improved, however, its problem was the higher order of controller. Linear state feedback control was used widely in most suspension controls, and a large number of works adopted Taylor series expansion to linearize the system model at the equilibrium position, which could result in the poor robustness performance due to ignoring the higher order terms [17,18]. In [19], an adaptive control approach was employed to the maglev bearing.…”

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