531X305NTBANG1 電源連接卡GE一般都要先烘軟繞組再拆線。但較大容量的電機(jī)，烘軟和拆線都較困難，故可采用下述方法拆除舊繞組：用一把扁鏟，將繞組的一端鏟除，切口與槽口齊平。繞組的另一端用鐵皮剪刀剪開(kāi)，然后用一根粗細(xì)適合的銅棒將槽中的漆包線沖出，最后清槽。如果銅棒合適，操作方法正確，每槽中的導(dǎo)線可一起沖出。在使用扁鏟時(shí)，要小心謹(jǐn)慎，切勿鏟壞定子鐵心用上述方法拆線時(shí)，可省去拆前的烘軟工序，節(jié)省時(shí)間，節(jié)約電能，且拆起來(lái)比較省力。
531X305NTBANG1 電源連接卡GE但這種方法適用于容量為7.5KW以下的電動(dòng)機(jī)，因小電機(jī)或微電機(jī)的機(jī)殼小，使用扁鏟不便操作。直流電機(jī)或者轉(zhuǎn)子是繞線式電機(jī)更新電刷，當(dāng)刷握與換向器表面垂直時(shí)，研磨電刷的方法是：在換向器的表面上鋪一張砂紙，手握相同型號(hào)的新電刷沿?fù)Q向器軸向往復(fù)摩擦，電刷的被磨面很快會(huì)被磨出與換向器表面相吻合的弧面來(lái)。先用較粗的砂紙，后用細(xì)砂紙。

531X305NTBANG1

531X305NTBANG1 電源連接卡GE研磨時(shí)，手握電刷要正，來(lái)回運(yùn)動(dòng)都要沿?fù)Q向器的軸線方向，不能偏斜，往復(fù)行程不要太長(zhǎng)。要注意防止電刷粉進(jìn)入電樞及換向器溝槽內(nèi)。磨好后，將電刷裝入刷握，起動(dòng)電機(jī)空載運(yùn)行幾分鐘后，取出各電刷檢查，接觸面一般要占總面積的80%以上才行，否則，要重新研磨直到合格為止。當(dāng)電機(jī)的刷握與換向器表面不垂直時(shí)，宜采用下述方法：將砂紙鋪在平面上，手握電刷按刷握的傾斜角度磨出一個(gè)斜面。然后將電刷裝進(jìn)刷握，用手轉(zhuǎn)動(dòng)電機(jī)轉(zhuǎn)子，這樣就會(huì)在電刷的斜面上磨出光亮點(diǎn)，然后用砂紙打磨光亮點(diǎn)（也可用刀子刮）。
531X305NTBANG1 電源連接卡GE打磨后，再將電刷裝進(jìn)刷握，用手轉(zhuǎn)動(dòng)電機(jī)轉(zhuǎn)子，同樣又會(huì)被磨出亮斑，面積比第一次大。如此進(jìn)行幾次，電刷的接觸面會(huì)愈來(lái)愈大，逐漸形成弧形。打磨亮斑時(shí)，每次不要打磨得太多，特別是到最后一次，一定要小心，只要用細(xì)砂紙稍微擦一下即可。如擦多了，接觸面反而會(huì)變小。經(jīng)實(shí)踐證明用這種方法研磨傾斜的電刷，時(shí)間快，效果好。步進(jìn)電機(jī)轉(zhuǎn)矩與轉(zhuǎn)速的曲線關(guān)系從上圖可以看到，步進(jìn)電機(jī)在低速段轉(zhuǎn)矩穩(wěn)定(變化量不大)；當(dāng)轉(zhuǎn)速大于約750rpm時(shí)，轉(zhuǎn)矩急速下降。由此，在使用步進(jìn)電機(jī)控制時(shí)，不應(yīng)進(jìn)行過(guò)高轉(zhuǎn)速的運(yùn)行使用。若使用過(guò)程中，將轉(zhuǎn)速設(shè)計(jì)過(guò)高，則可能會(huì)因?yàn)殡姍C(jī)轉(zhuǎn)速的下降而出現(xiàn)電機(jī)抖動(dòng)的現(xiàn)象。

531X305NTBANG1

531X305NTBANG1 power connection card GE generally must first dry the winding and then remove the wire. However, the larger capacity of the motor, drying and dismantling are more difficult, so the following method can be used to remove the old winding: with a flat shovel, one end of the winding is removed, and the incision is flush with the notch. The other end of the winding is cut with iron shears, and then a copper rod of suitable thickness is used to flush out the enameled wire in the groove, and finally the groove is cleaned. If the copper rod is suitable and the operation method is correct, the wires in each slot can be flushed out together. In the use of flat shovel, be careful, do not shovel the stator core with the above method when dismantling, can save the drying process before dismantling, save time, save energy, and more labor.
531X305NTBANG1 Power connection card GE However, this method is suitable for motors with a capacity of less than 7.5KW, because the small motor or micromotor housing is small, the use of flat shovel is inconvenient to operate. The DC motor or rotor is a winding motor to update the brush, when the brush grip is perpendicular to the commutator surface, the method of grinding the brush is: lay a piece of sandpaper on the surface of the commutator, hold the same type of new brush along the commutator axial friction, the grinding surface of the brush will soon be ground out of the commutator surface of the arc to match. Use coarse sandpaper first, then fine sandpaper.
531X305NTBANG1 power connection card GE grinding, the hand brush should be positive, the back and forth movement should be along the axis of the commutator, can not be deflected, and the reciprocating stroke should not be too long. Care should be taken to prevent brush powder from entering the armature and commutator groove. After grinding, the brush is loaded into the brush grip, the starting motor runs for a few minutes without load, take out the brush check, the contact surface generally accounts for more than 80% of the total area, otherwise, to re-grind until qualified. When the brush grip of the motor is not perpendicular to the surface of the commutator, the following method should be used: Lay the sandpaper on the plane, and grind a bevel according to the tilt Angle of the brush grip. Then put the brush into the brush holder, turn the motor rotor by hand, so that it will grind out bright points on the bevel of the brush, and then polish the bright points with sandpaper (you can also scrape with a knife).
531X305NTBANG1 power connection card GE after grinding, and then put the brush into the brush grip, rotate the motor rotor by hand, the same will be ground out bright spots, the area is larger than the first time. This is done several times, the contact surface of the brush will become larger and larger, and gradually form an arc. When polishing bright spots, do not polish too much at a time, especially to the last time, be careful, just use fine sandpaper to rub it a little. If you wipe more, the contact surface will become smaller. It has been proved by practice that the grinding of inclined brush with this method has fast time and good effect. The curve relationship between stepper motor torque and speed can be seen from the figure above, the stepper motor torque at low speed is stable (little change); When the speed is greater than about 750rpm, the torque decreases rapidly. Therefore, when using the stepper motor control, the operation of too high speed should not be used. If the speed is designed too high during use, it may cause motor jitter due to the decrease in motor speed.