General analytical model for calculating electromagnetic performance of permanent magnet brushless machines having segmented Halbach array

Abstract

Since a Halbach array exhibits a number of attractive features, it has been increasingly applied to different market sectors, including aerospace, industrial, domestic, renewable and healthcare and so on. The need of fast global optimisation, cost-effective design and physical understanding of the relationship between parameters and performance requires a powerful analytical model. Hence, this study develops a general analytical model which is capable of predicting the electromagnetic performance of slotted/slotless permanent magnet (PM) brushless machines with both even-and odd-segment Halbach array, having different magnet remanence, magnetisation angle and arc for each single magnet segment. The emphasis has been on the magnetisation which is the key in analytical modelling of PM machines having a segmented Halbach array and its investigation. The validity of proposed analytical model is extensively examined by finite-element analyses, together with its applications for global optimisation and comparative study.

Electromagnetic-based evaluation of different Halbach array topologies with gap consideration for the permanent magnet synchronous machines

“…The field vector in airgap and magnetic blocks (PMs) [4] can be calculated using where the amplitude of magnetization vector M in polar coordination for parallel topology can be defined in (3)…”

“…Electromagnetic (EM) solutions possess many technical advantages contrary to conventional topologies in terms of performance of electrical machines using the HABO that results in the improvement and increase in sinusoidal electromotive forces (EMFs) waveforms which originate from an increased sinusoidal airgap flux density distribution, and reduced machine's mass because of its self-shielding magnetization that allows the machine to operate without any back iron [1][2][3][4][5][6]. The main objective is to determine the best possible magnetization orientation with the gap consideration between magnetic segments particularly in the HABOs for the first time.…”

“…Shen and Zhu [4] discussed a general analytical model which is capable of predicting the electromagnetic performance of slotted/slotless brushless PMSMs with both even-and odd-segment Halbach array, having different magnet remanence, magnetization angle and arc for each single-magnet segment. The emphasis has been on the magnetization which is the key in analytical modeling of PMSMs having a segmented Halbach array and its investigation.…”

High specific torque motor for propulsion system of aircraft

“…The Halbach magnetic cylinder gives the effect of concentration of magnetic flux for either outward or inward cylinder and can be used in synchronous machines with PM [7,8]. The topology of this kind of synchronous machine with inner concentration of magnetic field is shown in Fig.…”

Modeling and Analysis of Halbach Magnetized Permanent-Magnets Machine by Using Lumped Parameter Magnetic Circuit Method

“…Magnetization (M ) of PMs was resolved into radial and tangential components using the analytical model in [23][24][25]. Especially, a general analytical model of magnetization (M ) was proposed to predict electromagnetic performance of PM brushless machines having segmented halbach array in [26].…”