Effect of pole embrace on the cogging torque and unbalanced magnetic forces of BLDC motors

Author

Sargazi, M. ; Esmaili, M. ; Jafarboland, M. ; Khajavi, M.

Author_Institution

Dept. of Electr. Eng., Malek Ashtar Univ. of Technol., Isfahan, Iran

fYear

2014

fDate

20-22 May 2014

Firstpage

826

Lastpage

830

Abstract

One of the important objects in Submarines is reducing or eliminating acoustic noise, where results Submarines hidden from scopes of enemies. BLDC motors are used in submarines, and Cogging torque and unbalanced magnetic forces in BLDC motors are important source of acoustic noise. This paper is a study on the Cogging torque for BLDC motors, with 14 poles and 12 slots. Cogging torque is calculated for various pole embrace by using the finite element method (FEM). The results show that there is optimal pole embrace for minimizing Cogging torque. Unbalanced magnetic forces are introduced by eccentricity between stator and rotor during magnetic process, this paper investigates effect of Pole embrace on the unbalanced magnetic force when rotor eccentricity exists.

Keywords

brushless DC motors; finite element analysis; magnetic forces; noise abatement; rotors; stators; torque; BLDC motors; FEM; acoustic noise elimination; cogging torque; finite element method; magnetic process; optimal pole embrace; rotor eccentricity; stator; submarines; unbalanced magnetic forces; Brushless DC motors; Forging; Magnetic forces; Permanent magnet motors; Rotors; Torque; Brushless dc motor; Cogging torque; Pole embrace; Submarine; Unbalanced magnetic force;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering (ICEE), 2014 22nd Iranian Conference on

Conference_Location

Tehran

Type

conf

DOI

10.1109/IranianCEE.2014.6999650

Filename

6999650