直流電機(jī)原理(已修改)
2025-08-17 10:12 本頁面
【正文】 Motor Start Theory 1 Motor Start Theory 電機(jī)起動原理 T202211001MST Motor Start Theory 2 Low Slip v Full Slip 低滑移與滿滑移 0 50 100 150 200 250 300 100 90 80 70 60 50 40 30 20 10 0 SLIP (%) FULL LOAD TORQUE (%) 0 100 200 300 400 500 600 700 CURRENT (%) When applying AC speed drives the motor‘s low slip performance characteristics are important. 當(dāng)使用 AC速度驅(qū)動電機(jī)低滑移時，性能特征是十分重要的。 In contrast, when applying soft starters the motor‘s performance at all levels of slip is important. 相反 ， 當(dāng)使用軟起動器時 ， 在滿滑移水平下的電機(jī)性能是十分重要的。 Soft Start Motor Start Theory 3 A motor‘s start performance characteristics set the limits of what can be achieved with either a full voltage or reduced voltage starter. 電機(jī)起動性能規(guī)定使用全電壓起動器或降壓起動器能達(dá)到的極限值。 It is especially important to consider motor start characteristics when seeking to: Minimise start current Maximise start torque 當(dāng)嘗試以下方式時考慮電機(jī)起動特性尤其重要： 將起動電流降至最小 將起動扭矩增至最大 Motor Performance 電機(jī)性能 Motor Start Theory 4 Rotor design affects starting performance. 轉(zhuǎn)子的設(shè)計影響起動性能。 Stator design affects full speed performance. 定子的設(shè)計影響全速性能。 The shape, position and material of the rotor bars affect the current drawn and torque produced during motor starting. 轉(zhuǎn)子桿的形狀、位置和材料影響引入電流和電機(jī)起動時產(chǎn)生的扭矩。 Motor Performance 電機(jī)性能 Motor Start Theory 5 A motor‘s start performance can be identified by examining the motor data sheet. 電機(jī)起動性能可通過檢查電機(jī)數(shù)據(jù)表得到確認(rèn)。 The table details selected performance data for a range of 110kW motors. 數(shù)據(jù)表詳述了 110kW電機(jī)系列選用的性能數(shù)據(jù)。 Typical Motor Data 典型電機(jī)數(shù)據(jù) Motor Speed FLC LRC LRT % FL Torque (rpm) (amps) (%FLC) (%FLT) Ef’ncy @3xFLC A 1470 191 600 263 93 B 1475 184 600 190 C 1475 191 570 150 92 D 1480 187 660 190 E 1470 185 550 120 92 36 F 1470 191 670 150 93 G 1480 190 780 200 94 H 1475 182 850 220 I 1480 190 670 120 94 24 Sample Of Typical 110kW Motors Motor Start Theory 6 Maximum motor start current under full voltage start conditions is defined by the motor‘s Locked Rotor Current (LRC). 全電壓起動條件下最大電機(jī)起動電流是由電機(jī)鎖定轉(zhuǎn)子電流（ LRC） 確定的。 LRC levels vary considerably between motors. LRC等級在電機(jī)間有顯著變化。 In the example, Motor H will draw 55% more current at start than Motor E. 在實(shí)例中，電機(jī) H引入的起動電流比電機(jī) E多 55%。 Start Current 起動電流 Motor Speed FLC LRC LRT % FL Torque (rpm) (amps) (%FLC) (%FLT) Ef’ncy @3xFLC A 1470 191 600 263 93 B 1475 184 600 190 C 1475 191 570 150 92 D 1480 187 660 190 E 1470 185 550 120 92 36 F 1470 191 670 150 93 G 1480 190 780 200 94 H 1475 182 850 220 I 1480 190 670 120 94 24 LRC ranges from 550% to 850% Sample Of Typical 110kW Motors Motor Start Theory 7 Motor start torque performance is indicated by the motor‘s Locked Rotor Torque (LRT) figure. 電機(jī)起動扭矩性能是由電機(jī)的鎖定轉(zhuǎn)子扭矩（ LRT） 圖表示的。 LRT levels vary considerably between motors. LRT等級在各個電機(jī)間有顯著變化。 In the example, Motor A produces twice as much torque during start as Motor I. 在實(shí)例中，電機(jī) A起動時產(chǎn)生的扭矩是電機(jī) I的兩倍。 Start Torque 起動扭矩 Motor Speed FLC LRC LRT % FL Torque (rpm) (amps) (%FLC) (%FLT) Ef’ncy @3xFLC A 1470 191 600 26
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