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用单片机实现投影机的多功能控制
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作者 欧阳军 《电子制作》 2003年第7期3-4,共2页
各位朋友在自制投影机的时候,比较难解决的是镜头的制作,因为在市面上的镜头中能够实现手动变焦,又能保证40-60mm口径的通光量,焦距范围又要符合自己的需要,价格还不能太高,这样的镜头很难找到,如果用参数最接近的相机的镜头,外观漂亮。
关键词 单片机 投影机 电动聚焦 步进电机 延时关断风扇 温度监控报警 图像翻转
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Development of HEP-XXMF Series Hall Thrusters in BICE 被引量:2
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作者 HU Yantin HU Dawei +5 位作者 WU Pengan LI Shengjun ZANG Juanwei MAO Wei SHAN Shihua YANG Jian 《Aerospace China》 2016年第2期9-16,共8页
Hall thruster is a type of electric propulsion thruster which is often regarded as a moderate specific im- pulse space propulsion technology and is used primarily for station keeping and orbit maintenance tasks. Magne... Hall thruster is a type of electric propulsion thruster which is often regarded as a moderate specific im- pulse space propulsion technology and is used primarily for station keeping and orbit maintenance tasks. Magnetic field is the most important aspect in Hall thruster's design. Each time the performance improvement of Hall thrusters is accompanied with the regeneration of magnetic field design. Now, all the maior space nations treat the magnetic field design as the key technology for Hall thrusters, and many Hall thrusters have emerged in recent years, for example, BPT-4000 and NASA- 173M. In China, based on magnetic focus technology, the Beijing Institute of Control Engineer- ing (BICE) has been developing Hall thrusters ranged from hundreds of watts to 5 kilowatts, including the IS00 W HEP- 100MF and the 5 kW HEP- 140blF Hall thrusters. This paper briefly reviews the development of the HEP-XXMF series Hall thruster. The principle of the Hall thruster, the design methods and the current status of HEP-100MF and HEP- 140MF are discussed in the paper. 展开更多
关键词 Hall thruster Electric propulsion
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