【正文】 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. 簡介 ： 有起動異步電動機(jī)的幾種常見方法：全電壓，降低電壓， Y 形三角洲，和部分繞組類型。錯誤的電容器的使用可能會導(dǎo)致重大損失。INDUCTION MOTOR STARTING METHODS AND ISSUES 感應(yīng)電動機(jī)的起動方法和問題 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. 摘要 ： 許多方法可用于啟動大型交流感應(yīng)電動機(jī)。此外，校正電容器 可用于降低功率因數(shù)，但必須注意正確的尺寸。 Index Terms: motor starting. Reduced voltage start auto transformer, wyesdelta, power factor correction 索引條款：電動機(jī)起動。每種方法都有其自身的利益，以及性能的權(quán)衡。一般有三點(diǎn)對電機(jī)轉(zhuǎn)速的扭矩曲線的興趣。如果這些點(diǎn)所需的負(fù)荷曲線的下方，然后電機(jī)不能啟動。 II. FULL VOLTAGE The full voltage starting method, also known as across the line starting, is the easiest method to employ, has the lowest equipment costs, and is the most reliable. This method utilizes a control to close a contactor and apply full line voltage to the motor terminals. This method will allow the motor to generate its highest starting torque and provide the shortest acceleration times. This method also puts the highest strain on the power system due to the high starting currents that can be typically six to seven times the normal full load current of the motor. If the motor is on a weak power system, the sudden high power draw can cause a temporary voltage drop, not only at the motor terminals, but the entire power bus feeding the starting motor. This voltage drop will cause a drop in the starting torque of the motor, and a drop in the torque of any other motor running on the power bus. The torque developed by an induction motor varies roughly as the square of the applied voltage. Therefore, depending on the amount of voltage drop, motors running on this weak power bus could stall. In addition, many control systems monitor under voltage conditions, a second potential problem that could take a running motor offline during a full voltage start. Besides electrical variation of the power bus, a potential physical disadvantage of an across the line starting is the sudden loading seen by the driven equipment. This shock loading due to transient torques which can exceed 600% of the locked rotor torque can increase the wear on the equipment, or even cause a catastrophic failure if the load can not handle the torques generated by the motor during staring. II。這種方法也提出了最高的菌株對電力系統(tǒng)由于高的起動電流，一般可以在六到七倍的電機(jī)電流正常滿負(fù)荷。因此，根據(jù)電壓下降量，電機(jī)在這一弱勢客車運(yùn)行可能失速。 A. Capacitors and Starting Induction motors typically have very low power factor during starting and as a result have very large reactive power draw. See Fig. 2. This effect on the system can be reduced by adding capacitors to the motor during starting. 答：電容起動異步電動機(jī)通常有非常低的功率因數(shù)在起動和結(jié)果具有非常大的功畫。t create any measurable output, but is rather the energy required for the motor to function. The product of the applied system voltage and this reactive power ponent can be measured in VARS (voltampere reactive). The capacitors act to supply a current that leads the applied voltag