Development of brushless and sensorless vibration motor used for mobile phone
- Authors
- Chung, SU; Hwang, GY; Hwang, SM; Kang, BS; Kim, HG
- Issue Date
- Sep-2002
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- axial gap; mobile phone; permanent-magnet motor; sensorless drive; vibration motor
- Citation
- IEEE TRANSACTIONS ON MAGNETICS, v.38, no.5, pp.3000 - 3002
- Journal Title
- IEEE TRANSACTIONS ON MAGNETICS
- Volume
- 38
- Number
- 5
- Start Page
- 3000
- End Page
- 3002
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/26804
- DOI
- 10.1109/TMAG.2002.803187
- ISSN
- 0018-9464
- Abstract
- With the wide use of mobile phones, a paging signal by a sound transducer acts as an environmental noise on many occasions, thus necessitating an alternative paging signal by a vibration motor. Conventional vibration motors employ three-phase windings with mechanical brushes for commutation, which is disadvantageous to manufacturing cost and productivity. In this paper, a new one-phase brushless and sensorless vibration motor is introduced utilizing digital signal processor chips in mobile phones. For electromagnetic field analysis, two-dimensional modeling can be implemented to determine the back electromotive force using axisymmetric boundary conditions. Geometric design parameters, such as coil pitch and magnet pitch. are considered for performance optimization. Through the experiments, it is shown that the proposed design has the equivalent performance with reduced number of parts, thus enhancing manufacturing productivity and reducing manufacturing cost.
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