【正文】 drawback to this method is that the motor heating on the first step of the operation is greater than that normally encountered on acrosstheline start. Therefore the elapsed time on the first step of the part winding start should be minimized. This method also 8 increases the magic noise of the motor during the first step. IV .Conclusion There are many ways asynchronous motor starting, according to the constraints of power systems, equipment costs, load the boot device to select the best method. From the device point of view, was the first fullpressure launch the cheapest way, but it may increase the cost efficiency in the use of, or the power supply system in the region can not meet their needs. Effective way to alleviate the buck starts the power supply system, but at the expense of the cost of starting torque. These methods may also lead to increased motor sizes have led to produce the required load torque. Inverter can be eliminated by the above two shortings, but requires an additional increase in equipment costs. Understand the limitations of the application, and drives the starting torque and speed, allowing you for your application to determine the best overall configuration. 9 英文資料 翻譯： 異步電動機(jī)起動 的 方法 摘要： 大容量的交流異步電動機(jī)有多種啟動方法。 電力工程 學(xué)院 畢業(yè)設(shè)計 (論文 )外文資料翻譯 原 文 題 目： INDUCTION MOTOR STARTING METHODS 原 文 來 源： ASHRAE Journal, Jan. 2021 學(xué) 生 姓 名： 學(xué) 號： 所在院 (系 )部 ： 專 業(yè) 名 稱 ： 南京工程學(xué)院 2021 年 03 月 15 日 1 英文資料 ： 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 mon starting methods and their remended applications. I. INTRODUCTION There are several general methods of starting induction motors: full voltage, reduced voltage, wyesdelta, 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 es 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 are three points of interest on the mo tor39。s speedtorque curve. The first is lockedrotor torque (LRT) which is the minimum torque which the motor will develop at rest for all angular positions of the rotor. The second is pullup torque (PUT) which is defined as the minimum torque developed by the motor during the period of acceleration from rest to the speed at which breakdown torque occurs. The last is the breakdown torque (BDT) which is defined as the maximum torque which the motor will develop. If any of these points are below the required load curve, then the motor will not start. The time it takes for the motor to accelerate the load is dependent on the inertia of the load and the margin between the torque of the motor and the load curve, 2 sometimes called accelerating torque. In general, the longer the time it takes for the motor to accelerate the load, the more heat that will be generated in the rotor bars, shorting ring and the stator winding. This heat leads to additional stresses in these parts and can have an impaction motor life. II. FULL VOLTAGE The f