High and low voltage motor maintenance steps - Solutions - Huaqiang Electronic Network

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one. The winding high-voltage motor needs to use double imine, monoimine, single thin double wire and other specifications of wire-wrapped flat wire according to the voltage level. After the material is ready, it can be wound into a winding machine to form a shuttle-type loop, general motor The shortest coil has a straight line portion of 25 cm and a maximum coil linear portion of 1.2 m. The winding can be single flat wound, single vertical winding, or double flat shifting, or double flat shifting, depending on specific requirements. The round enameled wire coil can also be wound by universal adjustment in the disc. The winding machine has a built-in speed regulating motor and a turbo vortex reducer to drive the winding machine to achieve 0-120 rpm, which can be reversed and braked, and can be counted back and forth. Generally, it can be wound 1600KW. Within the various motor coils, there is also a set of simple tensioners, which can control the tightness of the coils. The general repairing factory can choose the above products. If you encounter special large-scale specifications, you can choose special winding. equipment.
two. After the high-speed motor shuttle coil is wrapped before molding, it is wrapped with an insulating material such as a shrink tape and a yellow wax ribbon. The purpose is to protect the outer insulation of the coil, the interlayer insulation, and the inter-turn insulation from damage. It is protected from friction between the mold clamp and the nose pin during the drawing machine to prevent loose deformation.
The dressing coil is generally used by female workers. Because the female workers are fine-handed and work fast, 3-5 people are usually bandaged for pulling. An electric tape wrapping machine can also be used.
three. The forming machine, the expanding machine and the drawing machine are actually a kind of machine. The main purpose of the forming machine is to draw the vertical winding bobbin or the flat winding bobbin coil wound by the winding machine into a frame row coil, and the frame coil is a motor. The inner and outer circles of the stator core are standard, and they form a centripetal angled coil. The winding type coil can be completed by two technicians, while the pull (up) type generally requires three people. In the past, before there was no molding machine, there were several experienced masters in our department who could hand-mold, and 72 coils could be manually drawn in 15 minutes, but it was a little difficult for the larger coil drawing. The pull type machine can generally pull out 72 coils within 3 hours, and the straight part of each forming coil can be adjusted to a maximum length of 1.5 meters, the height can be adjusted within 80 cm, and the angle adjustment range is 0-60. Degrees, four fixtures can achieve universal locking. General manufacturers, such as a motor factory in Harbin, a factory in Xiangtan Motor Factory, etc., after purchasing more than ten such manual drawing machines, the overall evaluation is that the production seems to be simple, but the operation is flexible and convenient, the upper module, the mold release Quick, easy to pull, accurate positioning, accurate adjustment of the angle adjustment, is a practical product. Before the drawing type, the shape of the coil is drawn into a picture according to the actual condition of the motor to be repaired and used as a template to adjust the drawing machine. The drawing machine generally adjusts the drawing machine with the old coil as a template, and the drawing machine is four. The clip has an up, down, left and right adjustment mechanism, and the clamping mechanism locks the locking coil into the pull type program. The electric drawing machine produced by our company is almost the same as that produced in Shanghai. They are around 90,000 yuan. I am practical for the purpose. The electric drawing machine is priced at 25,000 yuan, and the hydraulic type drawing machine is priced at 26,000 yuan. Molding machine in China. Shanghai and Shenyang manufacturers do a good job. The mainframes they do mainly focus on large generators, but they are cumbersome to operate. They are mainly inflexible, moving, pitching, heightening, clamping, etc., and they are more expensive. .
four. After adding the mica insulation material with different layers, the thickness of the plastic high-voltage motor is increased a lot. The distance between the ends of the coil is occupied by the insulation layer. If you pay attention to it, the embedded line will not be embedded, which will make the ruled line difficult. Cold type. Cold-type molds (or positive molds), traditionally used in wood, each type of motor needs to make a set of molds, and the positive molds used by our company have the pitch adjustment, angle adjustment, height adjustment, etc. Aspect flexibility. Care must be taken during the tapping of the positive type to prevent damage to the interlayer insulation.
After the low-voltage motor is drawn, it is generally not cold-formed and directly enters the weaving process.
Fives. After the mica tape and the hot-pressed stator coil are cold-shaped, they enter the dressing process. At present, the materials with high coil insulation grade are basically localized, but the quality and price of the mica material are very different. Our company has been making coils and winding high-voltage motors for many years. We are familiar with the quality and price of more than a dozen products. After the students complete the work, they will inform the manufacturers of the details. High-voltage and low-voltage, different seasons, different grades of mica and other materials subscription standards are different. A female worker bandaged the coil for 10 hours a day, and the perimeter of the frame coil was expected to be bandaged in a 2 meter volt ring. How many layers of various motor grade coils are wrapped, whether the first package is straight or the end of the package is determined by the time of the rule. Mica tape, high resistance zone, shrinkage tape, what role does it play in the coil, which is good in quality, low in price, how to wrap it, where to wrap it, how many layers to pack, etc. It is best to master and memorize in the follow-up study. Essentials. Our company produces universal mica tape wrapping machine. The general case of the tape machine can replace 3-5 people. The manufacturers of mass production coils can be purchased. The customers who have purchased the large motor are still hand-wrapped at the beginning. When repairing a high-voltage motor, the following steps should generally be carried out at the same time: winding, drawing, cold-type, wrap-bearing, bag-high and low-resistance belts, all of which require 2-3 operations. At the same time, the working procedure of the next hot coil should also begin. The main purposes of hot pressing are:

1. It is convenient to embed after shaping.
2. The coil is cured to prevent moisture and water immersion.
3. Corona discharges out of the notch.
4. Complete the closure of the outside world and avoid high voltage breakdown.
Our company produces a thermoforming machine with a length of 1.2 meters, which can be adjusted up and down, left and right, and angle. After the customer has a fully automatic computer-controlled hot press, YR, JR, JS, TDK, and stator coils of the motor can be processed within 1600KW. And can be customized according to customer requirements.
The hot press can be equipped with automatic control devices, such as how many degrees of temperature work in the H-class temperature, how many degrees of constant temperature work in the F-class, when the hot-pressing time is more than one plant, when it is turned on, when the standby heat preservation can be realized, when hot pressing You should bring your own mold release agent, scavenger, residue and other tools to your designated manufacturer.
six. After testing the pressure-resistant hot-pressed coil, it should be placed for a period of time and then tested for withstand voltage. This is a process for testing the product. It has different pressure requirements according to different working voltages such as 3000V, 6000V, and 10000V.
How to prevent the piercing of the straight part or the curved part, and send it all must be mastered during hot pressing. Our company has mastered some techniques for repairing the coil of high-voltage motor, and mastered the technique of copying the coil after punching after pressure. You need to attend the study in person to know.
For pressure-resistant instruments, there are many products in the Wuhan area.
From the winding of the coil to the completion of the rule, it is generally necessary to make one more coil for the purposes of:
1. Leave the technical data of the model (wire gauge, number of turns, insulation thickness, straight length, camber, end length, lift height and pitch angle data).
2. Replace with which coil is not acceptable.
High-voltage motors are generally 200KW-2000KW, and the weight is most generally more than 3 tons. According to their own conditions, suitable cranes can be designed to facilitate the maintenance of motors. Seven. Ruled line (stator, rotor)
After the motor stator and rotor are dusted (usually flushed by high-pressure water gun), they are baked in the oven. After cooling, it is determined whether it is minor repair or overhaul. When the high-voltage motor is under minor repair, there is a set of small repair tools for coil tools, arc bending tools for rotor guide lines, and hot pressing tools for stator coil movements. There are many similar tools and self-made tools. The key is to combine technology and experience. How to not damage the original coil is the key. It is time-consuming and labor-intensive to take out the coil rework. Whether the old coil can be retrofitted is the key to saving time. (Generally, the purchase cycle of the wire package used for high-voltage motors is 1~2 weeks, which delays the repair time. These important issues need to be learned in the course. grasp).
When repairing the rotor, how to remove the copper bar (aluminum strip) in the rotor, how to change the strip, how to wrap the standard coil, and how to weld the test, etc., are not discussed here. When overhauling the rotor of the motor, it is necessary to take out all the coils. How to take them, how to keep the coils intact is the key technology. For example, a high-voltage motor should be taken out as completely as possible. If the wire gauge is not damaged, it can save money and save time when re-wrapping. When you need to recreate the coil, you must calculate the wire gauge and waste time. Generally, every three coils are subjected to withstand voltage when the stator is inlaid, so as to prevent the coil from discharging to the notches at both ends or discharging the rings at both ends and causing damage to the coil due to mistakes in the lower line. The wiring, the distance, the grouping, the wiring, the banding, the star point, and the motor lead are all embedded in the whole coil according to the operating rules of each class of motor. The general motor is sealed after hitting the pressure before the star point, and the three lead wires can be externally cited. There are also special lead wires for the outer lead triangle or external star line. General lead wires are purchased from the designated high voltage cable manufacturer. After all the wires are wired, the whole motor will be fully pressured and completed.
Eight. When the manufacturer of the varnish motor produces a motor in batches, it is required to purchase vacuum immersion equipment, which is provided by professional manufacturers. Generally, the repairing manufacturer uses an electric heating rod to heat the stator to a certain temperature and then flips it, and the stator port is double-sidedly painted upward. At the bottom of the painting, there is a lacquering device. It takes about two hours to complete the varnish and then put it into the oven. It is baked for three hours at low temperature and then dried for 18 hours at high temperature. It is released after 24 hours. The purpose is to insulate the insulation of the wire rod from the inner and outer wires of the groove to prevent the vibration from damaging the insulation structure. Please assemble the residual paint in the inner cavity of the stator.