外文翻譯--感應(yīng)電動(dòng)機(jī)的起動(dòng)方法和問(wèn)題-資料下載頁(yè)
2025-01-09 17:07本頁(yè)面
【正文】 nt from mon mode voltage. Without these features, shaft currents, which circulate through the shaft to the bearing, through the motor frame and back, create arcing in the bearings that lead to premature bearing failure, this potential for arcing needs to be considered when applying a motor/drive package in a hazardous environment, Division2/Zone2. 漁農(nóng)處的最大的缺點(diǎn)是成本相對(duì)于其他方法。驅(qū)動(dòng)器是最昂貴的使用，可能還需要具體的電機(jī)的設(shè)計(jì)被使用?；隍?qū)動(dòng)器的輸出信號(hào)，過(guò)濾或未經(jīng)過(guò)濾的，可能需要額外的電機(jī)結(jié)構(gòu)特點(diǎn)。這些結(jié)構(gòu)特征包括絕緣軸承，軸接地電刷和絕緣接頭，由于潛在的軸從共模電壓電流。如果沒(méi)有這些功能，軸電流，循環(huán)通過(guò)軸的軸承，通過(guò)電機(jī)支架與背，創(chuàng)造，導(dǎo)致軸承過(guò)早失效的軸承弧，潛在的電弧時(shí)需要考慮應(yīng)用電機(jī) /驅(qū)動(dòng)封裝在一個(gè)危險(xiǎn)的環(huán)境中，第二冊(cè) /區(qū)。 An additional construction feature of a motor used on an AFD may require is an upgraded insulation system on the motor windings. An unfiltered output signal from a drive can create harmonic voltage spikes in the motor, stressing the insulation of the motor is important to note that the features described pertain to motors which will be startedand run on an AFD. If the drive is only used for starting the motor, these features may not be necessary. 一種用在 AFD 電機(jī)的額外建筑功能可能需要的是升級(jí)的絕緣系統(tǒng)的電機(jī)繞組。從驅(qū)動(dòng)一個(gè)未經(jīng)過(guò)濾的輸出信號(hào)可以在電機(jī)產(chǎn)生諧波電壓尖峰，強(qiáng)調(diào)電機(jī)繞 組絕緣。需要注意的是，所描述的功能涉及到的發(fā)動(dòng)機(jī)將在該處跑起步很重要。如果驅(qū)動(dòng)器是用于啟動(dòng)電機(jī)，這些特征可能是不必要的。 Consult with the motor manufacturer for application specific requirements. 隨著應(yīng)用程序的具體要求，電機(jī)制造商咨詢。 D. Primary Resistor or Reactor Starting 初級(jí)電阻或電抗起動(dòng) This method uses either a series resistor or reactor bank to be placed in the circuit with the motor. Resistor starting is more frequently used for smaller motors. 該方法利用一系列電阻器或電抗器的銀行被放置在電路與電機(jī)。電阻起動(dòng)更頻繁地使用較小的電機(jī)。 When the motor is started, the resistor bank limits the flow of inrush current and provides for a voltage drop at the motor terminals. The resistors can be selected to provide voltage reductions up to 50%. As the motor es up to speed, it develops a counter EMF (electromagic field) that opposes the voltage applied to the motor. This further limits the inrush currents. As the inrush current diminishes, so does te voltage drop across the resistor bank allowing the torque generated by the motor to increase. At a predetermined time a device will short across the resistors and open the starting contactor effectively removing the resistor bank from the circuit. This provides for a closed transition and eliminates the concerns due to switching transients. 當(dāng)電動(dòng)機(jī)啟動(dòng)時(shí)，電阻銀行限制浪涌電流的流動(dòng)，并提供電機(jī)端子的電壓降。電阻可以選擇提供電壓降低到 50%。當(dāng)電機(jī)達(dá)到的速度，它開發(fā)了一個(gè)反電動(dòng)勢(shì)（電磁場(chǎng)）反對(duì)電機(jī)電壓。這進(jìn)一步限制了浪涌電流。由于浪 涌電流減少，那么 T＞ E 壓降電阻銀行允許轉(zhuǎn)矩由電動(dòng)機(jī)產(chǎn)生的增加。在預(yù)定的時(shí)間的裝置將在短路電阻和打開起動(dòng)接觸器的電路能夠有效消除電阻銀行。這提供了一個(gè)封閉的過(guò)渡，消除了由于切換瞬變的關(guān)系。 Reactors will tend to oppose any sudden changes in current and therefore act to limit the current during starting. They will remain shorted after starting and provide a closed transition to line voltage. 反應(yīng)堆將傾向于反對(duì)當(dāng)前的任何突然變化，因此起到限流起動(dòng)過(guò)程。他們將開始提供短路電壓關(guān)閉后過(guò)渡期。 IV. INCREMENT TYPE 四、增量型 The first starting types that we have discussed have deal with the way the energy is applied to the motor. The next type deals with different ways the motor can be physically changed to deal with starting issues. 首先，我們討論的類型與能量施加到電機(jī)的方式處理。第二類有不同方式的運(yùn)動(dòng)身體可以改變處理啟動(dòng)問(wèn)題。 Part Winding 部分繞組 With this method the stator of the motor is designed in such a way that it is made up of two separate windings. The most mon method is known as the half winding method. As the name suggests, the stator is made up of two identical balanced windings. A special starter is configured so that full voltage can be applied to one half of the winding, and then after a short delay, to the second half. This method can reduce the starting current by 50 to 60%, but also the starting torque. One 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 shoul 用這種方法對(duì)電機(jī)的定子是這樣一種方式，它是由兩個(gè)獨(dú)立的繞組設(shè)計(jì)。最常見(jiàn)的方法被稱為半繞組的方法。顧名思義，定子是由兩個(gè)相同的平衡繞組。一個(gè)特殊的起動(dòng)器被配置為全電壓可用于纏繞的一半，然后在短暫的延遲后，到下半年。該方法可以由 50～ 60%降低啟動(dòng)電流，而且起動(dòng)轉(zhuǎn)矩。這種方法的一個(gè)缺點(diǎn)是，在操作的第一步電機(jī)發(fā)熱是大于通常遇到的跨行開始。因此，經(jīng)過(guò)時(shí)間的部分繞組起動(dòng)引起的第一步。
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