Method of AC motor coil rewinding step
First, the data in the old motor coils
AC motor when rewinding the following data collection is complete, accurate, and make records. Be
1. The total number of slot motor. Be
2. The diameter of the coil wire (standard model). Be
3. Wiring (triangle or star). Be
4. parallel branch. Be
The winding and the number. Be
6. The winding method (single or double). Be
7 turns each. Be
8. Pitch (how many cross-slot). Be
FIG 9. depicts the windings expand. Be
The measuring coil end portion and the straight portion length. Be
11. The insulation between the primary coil and the insulation layer thickness (number of layers) and material specifications models. Be
Second, the preparation before the coil rewind
1. The winding made according to the measurement data. Note that the line not be too large mold, can not be too small. Be
The number of turns of the coiled coil. Be
3. an insulating material, and embedding the tool wedge preparation. Be
4. Clean the trough. Be
Third, the developed view according to the winding coil embedded, and note:
1. coil embedded in insulating mat should be preceded by good insulating core projecting length depends on the size of the motor capacity, the core extending generally 15 ~ 25mm. Be
2. Note that at the notch wire coil embedded, must not damage the main insulation. Be
3. It should be made uniform both longitudinal ends, arranged in neat rows. Be
4. The lower-layer winding side should be embedded. Using multiplexed pilot slot insulating interlayer to cover the pad when the insulation, into the wedge. Phase to the end portion of the insulating pad. Be
5. FIG Expand coil connected, with a solder weld, no insulating portion insulating wrap, the motor can be small glass tube with plastic sleeve. By tying the ends good binding, and do not loose neat. The entire coil end portion is formed bell mouth. Be
Fourth, the electrical Jinqi
1. Before impregnation the motor prebake 105 ~ 110 ℃ 4-6 hours. Pre-bake must be thorough, if moisture is not drained, after dipping can not be discharged. Be
2. Conditional dipping method may be employed, the inversion motor (trough upright orientation) wholly immersed in the paint, dip 10 ~ 15min to need no bubble to emerge so far. Be
3. The casting method can be used many times: The inverted motor (trough upright orientation), put under a Qipan, paint poured from the top until the lower end until the full penetration, the method described above and then turn counter is poured. After dipping in the paint drip dry air, clean core lumen. Be
4. The motor was warmed gradually dried, the drying temperature is the same as prebaking. The same method was dried multiple times, and at least 6 h were dried at the middle. Last drying should be stable at temperatures (105-110 ° C) insulated resistance (greater than or equal to 0.5 mΩ) stabilization 3-5h is qualified.
5. The rotor winding type motor can replace the coil after dipping by the above method. Be
6. Common motor melamine alkyd varnish grades 1032. No grade or gas shall not be used in insulating paint. Be
Fifth, motor test
1. Measurement of the insulation resistance. 2. The DC resistance of the measuring coil. 3. The measured polarity. Be
4. Test for the coil voltage. 5. for load test. 6. If necessary for load test.
The stator windings of the motor rewinding step
Serious damage to the motor windings, when local repair can not, it should remove the original whole winding, embedded in the heart re-winding, rewinding stator winding step as follows:
1. identify the causes of damage, the original data record
Identify the cause of damage, the repair can be re-burn prevention. Record raw data to fill a single motor repair records. In the removal of the winding, should leave a more complete coil so that amount of each portion size. Recording test data in a single test to go through re-filled after rewinding well.
2. Remove the damaged stator winding
The method of removal of the stator winding has a lower: (1) electric current heating method: connecting the winding ends open, into a single phase in low voltage high current heated one phase winding, when the insulating softens when winding smoke, power off , hit wedge, by hot removal of winding. (2) using an oven, a heating burner, etc., winding and quickly dismantled. Note that prevent burning heating core. (3) a solvent for dissolving method: This method is only applicable to removal of one kilowatt or less compact motor windings. Common solvents are toluene, paraffin solvents and the like. (4) cold drawing method: a core at a first end of the coil abuts against cut, the wire is pulled out with forceps in the other end, such as a coil integrally bonded to the coil end portion can be used with small iron rods severed against the hammer .
3. The ready insulating material
(1) Insulation tank: The tank cited paper, the projecting length of the core with the temporary lead groove paper slot insulation, to be based on the capacity of the motor.
(2) end of the insulating: same as phase insulation composite polyester film with a layer of insulating paper end, the rear end portion of the insulation must be lashing.
(3) Lead Insulation: lead portion and the winding end of the wire is connected, with alkyd glass cloth tape coated with a layer stack half, and then put out with alkyd glass fiber sleeve, when the lashing bar with its end portion firmly .
4. Rao coil system
Simple production (1) of the winding body: the stator coil is made from the winding former Shangrao. (2) Rao coil system: three-phase asynchronous motor using small coils are embedded bulk molding using a wire wound on a winding machine. (3) coil for Rao should note: when the wire should be wound neatly to avoid cross confusion; turns must be accurate; consistent wire diameter; wire insulation intact; both ends of the coil winding to be tied good relief; with good after about DC resistance measurement bridge for each phase winding, to check the number of turns. Read more
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