Electromagnetic Analysis of High Speed Machines with Diametrically Magnetized Rotor, Considering Slotting Effect and Applied to New Magnetization Modeling

Abstract

This paper deals with the analysis of high speed machines with diametrically magnetized rotor, accounting for slotting effect. On the basis of a two dimensional (2-D) field solutions derived in terms of magnetic vector potential and polar coordinate systems, this paper predicts open-circuit field, armature reaction field, field on load, torque and back emf. In particular, new magnetization modeling technique which is reasonable in polar coordinate system is presented. The analytical results are validated extensively by comparison with finite element (FE) analyses.

Integrated Design of a High Speed Magnetic Levitated Brushless Direct Current Motor System

“…The maximum value of B is calculated as 0.35 T. The result of back-EMF coefficients are 0.0677 Vs/rad, which would be validated via deceleration EMF test in Section 4.1. The general solutions for back-EMF and the flux density distribution in air-gap are introduced in [31] in detail. Then, electromagnetic field equation is modeled.…”

“…Then, electromagnetic field equation is modeled. In addition the eddy current expression, including varieties of harmonic components penetrating into the whole surface of the rotor, can be deduced from equivalent current sheet [31]. Thus, based on the Poynting vector theory, the corresponding average electromagnetic power loss in rotor is given by [27]:…”

Analytical Expression of the Magnetic Field Created by a Permanent Magnet With Diametrical Magnetization

“…Permanent magnets have been widely utilised in various applications [1][2][3][4][5][6][7][8][9][10]. Amongst them, cylindrical and ring shaped permanent magnets with diametrical magnetization have been widely used in electrical motors [11][12][13][14] and in position sensory systems [15][16][17][18] including human intention recognition [19]. The requirement for an accurate and fast-computed analytical expression of the magnetic field generated by a diametrically magnetised permanent magnet that can facilitate the design optimization of magnetic devices and modelling dynamical systems [20,21], leads to various ways of expressing the magnetic field of a permanent magnet of this kind.…”