This thesis focues on the realization of small size brushless DC fan motor driving circuit, adding the protection circuit of commutation to H bridge, in addition, the function of low current limiter, and slow rotation speed limiter are also implemented to the more stable rotation. With regard to the strategy of rotation speed control, we use speed feedback controller to slove noise problem which occurs in high frequency full speed excited and adopt thermistor accompanied with the voltage divided circuit to achieve speed control with temperature. Finally, for the sake of reducing the cost and shrinking the size of system, the design of sensorless mode is proposed and the rotation speed control system is realized under sensorless mode.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0718107-172856 |
| Date | 18 July 2007 |
| Creators | Chen, Yi-Chun |
| Contributors | I-Chih Kao, Yung-Chun Wu, Tzuen-Lih Chern, Jerome Chang, Geeng-Kwei Chang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718107-172856 |
| Rights | not_available, Copyright information available at source archive |
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