Design Optimization of Radially Magnetized, Iron-Cored, Tubular Permanent-Magnet Machines and Drive Systems

Abstract

Abstract-In this paper we deduce, from analytical field solutions, the influence of leading design parameters on the performance of a radially magnetized, iron-cored, tubular permanent-magnet machine and its drive system. We derive analytical formulas for predicting the open-circuit electromotive force, the thrust force, the iron loss, and the winding resistance and inductances, as well as the converter losses. The force density, the machine and drive system efficiencies, and the power factor and converter volt-ampere (VA) rating are established as functions of a set of machine dimensional ratios, with due account of magnetic saturation and subject to a specified thermal constraint. We validate the utility and accuracy of the analytically derived formulas by finite-element calculations. Finally, we show that the design optimization of such a linear drive system must account for the losses and VA rating of the converter as well as the design parameters of the tubular machine.

Design and Optimization of a Tubular Permanent Magnet Linear Motor Using Finite Element Method and Permeance Analysis Method for Spray Application

“…At that point, the thrust constant should be the maximum value. The above mentioned analyses have good arguments with previous studies carried by Wang and Howe (2004), Hirata et al (1992) and Mizuno et al (2000). The main objective of this analysis was to optimize the size of the linear motor by comparing the data of the thrust constant, electrical time constant and mechanical time constant corresponding to coil height.…”

“…Magnetic flux distribution can also be predicted from FEM analysis. Then several permeance thrust models are developed to optimize the size of the motor by analyzing the effect of thrust constant, electrical and mechanical time constant (Parvez Iqbal et al, 2011b;Wang and Howe, 2004;Hirata et al, 1992;Mizuno et al, 2000). Finally, based on the optimized data the linear motor has been fabricated and tested with newly developed spray gun.…”

Design Aspects of an Active Electromagnetic Suspension System for Automotive Applications

“…It should be noted that for Halbach and axial magnetization the back iron for the magnets vanishes, h ti = 0 or h si = 0 for interior and exterior magnet, respectively. Modeling of the magnetic field, B, inside the air gap is performed using the analytical framework proposed in [6], [13], hence end effects of the finite length of the stator and translator are neglected. Calculation of the force is obtained using the Lorentz equation at the center of the air gap and coil region, R ag .…”

Performance Analysis and Modeling of a Tubular Staggered-Tooth Transverse-Flux PM Linear Machine

“…Hence, linear machines are being used increasingly in applications ranging from manufacturing automation [2,3], electromagnetic launcher [4], transportation [5,6] and electrical power generation [7][8][9], to household appliances [10] and healthcare [11]. Within the various types of linear machines, tubular permanent magnet (PM) linear machines are quite promising for linear drive systems because of their distinctive features, including high power density, low force ripple, no unbalanced magnetic force on the shaft, and excellent servo characteristics, etc.…”