外文翻译--感应电动机的起动方法和问题

INDUCTION MOTOR STARTING METHODS AND ISSUES感应电动机的起动方法和问题Abstract __ny methods can be used to start l

INDUCTION MOTOR STARTING METHODS AND ISSUES 感应电动机的起动方法和问题 Abstract __ny methods can be used to start large AC induction motors. Choi__s such as full voltage, redu__d voltage either by autotransformer or Wyes -Delta, asoft starter, or usage of an adjustable speed drive can all h__e potential advantages and trade offs. Redu__d voltage starting can lower the starting torque and help prevent da__ge to the load. Additionally, power factor correction capacitors can be used to redu__ the current, but care must be taken to size them properly. Usage of the wrong capacitors can lead to significant da__ge. Choosing the proper starting method for amotor will include an ____ysis of the power system as well as the starting load to ensure that the motor is designed to deliver the needed perfor__n__ while minimizing its cost. This paper will examine the most common starting methods and their recommended applications. 摘要： Y 许多方法可用于启动大型交流感应电动机。选择如全电压，通过自耦变压器或形三角 电压降低，软起动器，或可调速驱动器的使用都可以有潜在的优势和权衡。降压起动可以降 低起动转矩，防止损坏负载。此外，校正电容器可用于降低功率因数，但必须注意正确的尺 寸。错误的电容器的使用可能会导致重大损失。选择适当的启动方法，电机将包括为保证电 机的设计提供了所需的性能的同时，最大限度地降低其成本的初始荷载的动力系统分析。本 文将最常用的起动方法和推荐的应用研究。 Index Terms: motor starting. Redu__d voltage start auto transformer, wyes-delta, power factor correction Y 索引条款：电动机起动。降压起动自耦变压器，形三角洲，功率因数校正 INTRODUCTION There are several general methods of starting induction motors: full voltage, redu__d voltage, wyes-delta, and part winding types. The redu__d 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 alarge variety of automotives when it comes to specifying the motor to be used in agiven application. Each method has its own benefits, as well as perfor__n__ trade offs. Proper selection will involve athorough investigation of any power system constraints, the load to be ac__lerated and the overall cost of the equipment. 简介： Y 有起动异步电动机的几种常见方法：全电压，降低电压，形三角洲，和部分绕组类型。 低电压型可包括固态启动器，变频驱动器，和自耦变压器。这些，连同全电压，或直接起动， 给买方的汽车种类繁多的时候指定在给定的应用程序中使用的电机。每种方法都有其自身的 __ 利益，以及性能的权衡。正确的选择会涉及的任何权力制约制度进行的调查，以加速负载 设备的整体成本。 In order for the load to be ac__lerated, the motor must generate greater torque than the load requirement. In general there are three points of interest on the motor's speed-torque curve. The first is locked-rotor torque (LRT) which is the minimum torque which the motor will develop at rest for all angular positions of the rotor. The second is pull-up torque (PUT) which is defined as the minimum torque developed by the motor during the period of ac__leration from rest to the speed at which breakdown torque occurs. The last is the breakdown torque (BDT) which is defined as the __ximum torque which the motor