Stepper motor disassembly step motor with first remove the pulley or coupling, discharge machine tail wind cover, remove the front bearing cover screw ends and screw. Bigger stepper motor, open before using scriber respectively on the two end cover and base, to prepare for the original fixed position to mark with wooden hammer hit the top of the front axle, the rotor and the end cover to open it from the stand, and then from the stator rotor. When taking the rotor is important to note that don't let the rotor abrade the stator winding end insulation. Observe the stepper motor bearings with and without damage, whether oil metamorphism, dried up. Caught with the hand shake before and after the bearing outer ring, whether its loose too much. Such as check the bearing is normal, don't disassemble, clean with kerosene or diesel on bearing, such as inspection has a problem, the available puller dismantle bearing. When the shaft and bearing fit too tight or rust, can adopt the method of heating. Encase with asbestos rope turn axis, using oxyacetylene flame burner type fast evenly heating bearings to 250 ℃ : left and right sides, with a strike it out. Cold demolition method is: under the bad bearing with good wood cushion, with an iron hammer will break outside, remove the outer ring, with a handheld grinder grinding wheel bearing inner ring cut a mouth (Don't cut through, so as to avoid damage to the rotor shaft neck)And then with a hammer percussion inner ring, make the incision rupture to take out the inner ring. In replacing bearings, directly to install easy to scratch the rotor shaft neck. Generally smaller bearings can be installed directly, when installed to replace a larger bearings, had better put the bearing into the oven heating, when the temperature to 100 ℃ left to the right, the strike will bearing sleeve on the rotor shaft neck, with steel tube on the shaft, resist bearing inner ring, tapping steel tube to make uniform shaft in place. Note: the installation of bearings, bearing should be engraved with models side outwards, in order to check change in the future. According to the capacity of bearing inner space half add grease, high speed can just add a little less, low speed can be a little more. Excess gas can lead to when bearing overheating after operation, and lubricating oil is thinning out and are swept rotor endogenous wind leaf on the stator winding, insulation between the winding down, breakdown caused by short circuit, the stepper motor winding burn. The commonly used lubricating oil with calcium base grease, grease, lithium base grease, etc. Calcium base grease has good resistance to water, but poor heat resistance (≤70 ℃ )Fat, sodium based heat (≤120% :)But poor water resistance. Lithium base grease has the advantage of the two, but the price is higher. The user can choose according to actual demand. Attention should be paid to the cleaning of the grease, don't let it with dust, scrap iron, sand, if contaminated with bearing grease, can cause bearing wear, bearing damage in advance. To sum up, due to the bearing damage sweep into the rotor chamber, make the motor winding burned a lot of examples, should focus on.
