Magnetic Flux Distribution in the Air-Gap of Cylindrical- and Disc-Form DC Micromotors used for Mobile Phones

Author

Lukács, Attila ; Halmai, Attila

Author_Institution

Dept. of Mechatronics, Opt. & Instrum., Budapest Univ. of Technol. & Econ.

fYear

2006

fDate

3-5 July 2006

Firstpage

79

Lastpage

81

Abstract

Mobile phones have a vibration function generated by a vibration motor. There are two types of the used vibration motors (DC): the bell-rotor motor and the discrotor motor. Both of them employ a rare-earth magnet to the magnetic excitation of the motor. In both cases the motor construction determines the shape of the air-gap. We have measured the magnetic induction in the air-gap in both vibration motors. A two-dimensional finite-element method (FEM) has been used to calculate extensively the magnetic field of a rare-earth magnet (NdFeB) in the air-gap. The measured and the simulated air-gap induction results are compared in this paper

Keywords

magnetic flux; micromotors; mobile handsets; neodymium alloys; NdFeB; air gap; bell-rotor motor; cylindrical-form DC micromotors; disc-form DC micromotors; discrotor motor; finite-element method; magnetic flux distribution; magnetic induction; mobile phones; motor magnetic excitation; rare-earth magnet; vibration motor; Air gaps; DC motors; Finite element methods; Induction motors; Magnetic field measurement; Magnetic flux; Micromotors; Mobile handsets; Shape; Vibration measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Mechatronics, 2006 IEEE International Conference on

Conference_Location

Budapest

Print_ISBN

0-7803-9712-6

Electronic_ISBN

0-7803-9713-4

Type

conf

DOI

10.1109/ICMECH.2006.252501

Filename

4018336