异步电动机起动的方法外文资料翻译 (2).doc

南京工程学院 电力工程学院 毕业设计(论文)外文资料翻译 原 文 题 目： INDUCTION MOTOR STARTING METHODS 原 文 来 源： ASHRAE Journal, Jan. 2009 学 生 姓 名： 学 号： 所在院(系)部： 专 业 名 称： 南京工程学院 2011年03月15日 英文资料： INDUCTION MOTOR STARTING METHODS Abstract - Many methods can be used to start large AC induction motors. Choices such as full voltage, reduced voltage either by autotransformer or Wyes - Delta, a soft starter, or usage of an adjustable speed drive can all have potential advantages and trade offs. Reduced voltage starting can lower the starting torque and help prevent damage to the load. Additionally, power factor correction capacitors can be used to reduce the current, but care must be taken to size them properly. Usage of the wrong capacitors can lead to significant damage. Choosing the proper starting method for a motor will include an analysis of the power system as well as the starting load to ensure that the motor is designed to deliver the needed performance while minimizing its cost. This paper will examine the most common starting methods and their recommended applications. I. INTRODUCTION There are several general methods of starting induction motors: full voltage, reduced voltage, wyes-delta, and part winding types. The reduced voltage type can include solid state starters, adjustable frequency drives, and autotransformers. These, along with the full voltage, or across the line starting, give the purchaser a large variety of automotives when it comes to specifying the motor to be used in a given application. Each method has its own benefits, as well as performance trade offs. Proper selection will involve a thorough investigation of any power system constraints, the load to be accelerated and the overall cost of the equipment. In order for the load to be accelerated, the motor must generate greater torque than the load requirement. In general there a