Analysis of high speed permanent magnet motor with powder core material

Abstract

Purpose -The purpose of this paper is to investigate application possibilities of soft magnetic composites (SMC) in the design of high speed permanent motors for home appliances. Design/methodology/approach -The design of high speed permanent magnet motor (HSPM) with core made of SMC has been proposed. The governing information about SMC has been presented. The possible advantages and disadvantages of applying magnetic powder materials in the design of electrical machines have been studied. To solve the partial differential equations describing magnetic vector distribution in considered HSPM, the edge element method (EEM) has been applied. The formulas of permanent magnet and winding descriptions, and electromagnetic torque calculations have been presented and studied. To verify accuracy of methodology and functionality of the elaborated software, a prototype of the considered motor has been built and the experimental setup for testing torque and electromotive force has been elaborated. The comparison between measured and simulated motor characteristics have been presented and discussed. Findings -Comparison between measured and simulated motor characteristics proves the model accuracy. The obtained results show that the designed HSPM motor has sinusoidal electromotive force waveforms, low cogging torque value and the sinusoidal torque versus rotor angle characteristics. Moreover, it has been indicated that the application of SMC materials can reduce power losses in the high speed motors. Originality/value -The paper describes the development of the numerical method and software for analysis of HSPM with core made of powder materials.

A correlation of magnetic properties with material density for soft magnetic composite cores

“…e.g. (Cyr, 2007, May et al, 2011, Wojciechowski et al, 2012. In the present paper an attempt to combine the effects of compaction pressure and hardening temperature in a description of magnetic properties is undertaken.…”

Decomposition of the compromise objective function in the permanent magnet synchronous motor optimization

“…There are considered numerous structures of PMSM rotors in literature (Chang et al, 2012;Hafner et al, 2010;Gwozdziewicz and Zawilak, 2013;Wojciechowski et al, 2012). Typical structures are shown in Figure 1.…”

Strategies for two‐dimensional and three‐dimensional field computation in the design of permanent magnet motors

“…When describing sources, the electric vector potentials were used, T m and T 0 , where T m is the magnetisation vector of permanent magnets, whereas T 0 describes the conduction field of currents in windings made of thin wires. Details about how to establish the components Θ m and Θ 0 for 2D and 3D formulations may be found in [12][13][14] and will not be repeated here. Instead the procedure for finding the reluctance R μ,i,j will be explained.…”

“…It is then possible to derive relationships of the dependence of the torque and emf on time or rotor position angle. The electromagnetic torque was established using the Maxwell tensor method [16], whereas 'emfs' in the windings wound with thin wires used a formula presented in [12,14].…”