机车服务厂空气压缩机节能控制系统.外文翻译..docx

J. Electromagnetic Analysis Applications, 2009, 2: 114-117 doi:10.4236/jemaa.2009.12018 Published Online June 2009 (www.SciRP.org/journal/jemaa)Air Compressor Control System for Energy Saving in Locomotive Service PlantWenyu Mo Department of Control Science of Engineering, Huazhong University of Science and Technology, Wuhan, China.Email: Mowenyu@ Received January 2nd, 2009; revised March 12th, 2009; accepted March 20th, 2009.ABSTRACTThe actuality and disadvantages of traditional high power asynchronism motor drive air compressor in locomotive service plant are discussed. In order to reduce the energy consumption and obtain safe running, a variable frequency control method to the motor is supplied. A PLC with touch screen is used for monitoring the status of the compressor and its control system. It also presents energy consumption analysis caused by the variable frequency control method in a locomotive service plant.Keywords: Variable Frequency, Air Compressor, Locomotive Service Plant1. Introduction Air compressor is a key equipment to provide air power, which is driven by asynchronism motor. Air compressor is operated by adjusting rotation speed of the motor. In general, the output air pressure in pipeline of the air tank is acted as controlling object in the system. The air pressure in the pipeline is controlled to be fluctuate in a certain range. Its upper limit (0.7MPa) is under the rating pressure of the pipeline, and its lower limit (0.4MPa) is above the rating pressure of the equipment using the compressive air. Usually, there are two ways to control the air pressure in the pipeline to content this demand. The first method is starting up and stopping the motor continually for adjusting air pressure in pipeline. When the air pressure is under the upper limit, the air compressor operates until the air pressure goes up to the upper limit, then the motor stops running. But the air pressure will be lowered with air leak or air consuming equipment operating. Whe