A design of a two-phase permanent magnet vibration motor used for mobile phones

With the advent of the telecommunications era, a mobile phone becomes a necessary communication device in modern society. However, a paging signal by a sound transducer often acts as an unpleasant noise, thus necessitating a paging signal by a vibration motor. The conventional flat type vibration mo...

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Bibliographic Details
Published in:Journal of applied physics 2002-05, Vol.91 (10), p.6985-6987
Main Authors: Chung, Shi-Uk, Hwang, Sang-Moon, Kim, Tae-Jong, Hwang, Gun-Yong, Kang, Beom-Soo
Format: Article
Language:English
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Summary:With the advent of the telecommunications era, a mobile phone becomes a necessary communication device in modern society. However, a paging signal by a sound transducer often acts as an unpleasant noise, thus necessitating a paging signal by a vibration motor. The conventional flat type vibration motor uses three-phase windings with three phase coils. In this article, a new design of a vibration motor using a V connection with two phase coils is presented, increasing mass productivity. For electromagnetic field analysis, due to the motor symmetry, two-dimensional modeling can be implemented for fast computation, and performance is predicted by the finite element method. The winding distribution angle turns out to be the most important design parameter for the elimination of dead points, and a new coil configuration is suggested which has no adverse effect on motor size and weight. Experimental tests of vibration confirm the validity of the proposed design.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1456399