A Three-Phase Permanent Magnet Brushless DC Motor for Low-Power Low-Speed Fan Applications - Optimizing Cost and Efficiency

Author

Gupta, Ranjan Kumar ; Mohan, Ned

Author_Institution

Univ. of Minnesota, Minneapolis

fYear

2007

Firstpage

846

Lastpage

852

Abstract

In this paper, a three-phase permanent-magnet brushless-DC motor is described with three-times the measured efficiency in the same frame size as compared to fan motors of conventional designs. The finite element (FE) analysis is performed to compare bonded NdFeB, ferrite and hybrid permanent magnets to optimize the cost and efficiency of the motor. Experimental results on a laboratory prototype verify the simulations. A novel design optimization procedure using Halbach magnetization is proposed to further increase the efficiency by shaping the back-EMF waveform. Based on FE analysis, efficiency gains of using Halbach-magnetization, in combination with 120-degree and 180-degree phase-current- conduction motors are compared.

Keywords

boron alloys; brushless DC motors; fans; ferrites; finite element analysis; iron alloys; neodymium alloys; permanent magnet motors; permanent magnets; Halbach magnetization; back-EMF waveform shaping; cost optimization; design optimization; efficiency optimization; ferrite magnets; finite element analysis; hybrid permanent magnets; low-power low-speed fan; three-phase permanent magnet brushless DC motor; Bonding; Brushless DC motors; Cost function; DC motors; Ferrites; Finite element methods; Magnetic analysis; Performance analysis; Permanent magnet motors; Size measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE

Conference_Location

New Orleans, LA

ISSN

0197-2618

Print_ISBN

978-1-4244-1259-4

Electronic_ISBN

0197-2618

Type

conf

DOI

10.1109/07IAS.2007.133

Filename

4347882