Generally, female workers are used to tie coils. Because they are careful and work fast, usually 3-5 people tie coils to draw pictures. You can also use an electric tape winding machine. Due to the addition of different layers of mica insulation materials, the thickness of the high-voltage motor has increased a lot, and the distance between the ends of the coil has been squeezed by the insulation layer. If you don't pay attention, it will not fit in when you bury the wire, which makes it difficult to bury the wire. This requires cold forming. Traditionally, cold forming dies (or male dies) are mostly made of wood, so each motor needs to make a set of dies, and the male dies used by our company have the flexibility to adjust the distance, angle and end. Attention must be paid to knocking during normal molding, so as not to destroy interlayer insulation.
After the low-voltage motor is led out, it is generally not cold-formed, and directly enters the assembly process. The stator coil enters the winding process after cold forming, and the materials with high insulation level of the coil are basically localized, but the quality and price of mica materials are very different. Henan Quanxin Liquid Starting Equipment Co., Ltd. has been producing coil and winding high-voltage motors for many years and is familiar with the quality and price of more than a dozen products. Students will inform the manufacturer of the specific situation after graduation. Different grades of mica and other materials have different subscription standards due to different voltages and seasons. A female worker winds the coil 10 hour a day, and a 10000 volt coil with a frame coil circumference of 2 meters is expected to wind three times. How many layers of coils of various motor brands are wrapped, whether straight lines are wrapped first or ends are wrapped later, depends on when wires are embedded. As for the function of mica tape, high stopband and shrinkage tape in the coil, which is of good quality and low price, how to pack it, where to pack it, how many layers to pack it, and so on. It is best to master and remember the essentials in the next study. Our company produces universal mica tape winding machine. Generally, a tape winding machine can replace 3-5 people to work, and manufacturers who mass-produce coils can choose. Customers who are repairing large motors for the first time, it is better to wrap them by hand when repairing them for the first time. When repairing high-voltage motors, generally, the following steps should be carried out at the same time: winding, traction, cold straightening, mica tape wrapping and high-low gear wrapping. These processes need 2-3 people to operate. At the same time, the next hot-pressing coil process should also be started. The main purpose of hot pressing is:
1. is set to facilitate rule embedding.
2. Curing of the coil can be moisture-proof and waterproof.
3. Corona discharge outside the notch.
4. Complete sealing to the outside to avoid high voltage breakdown.
The length of the hot-pressing molding machine produced by Henan Quanxin Liquid Starting Equipment Co., Ltd. is 1.2m, and the angle can be adjusted up, down, left and right. After the customer has a fully automatic computer-controlled hot press, it can process stator coils of YR, JR, JS and TDK and motors within 1600KW. And can be customized according to customer requirements.
Hot presses can be equipped with automatic control devices, such as how many degrees of H-class temperature work at constant temperature, how many degrees of F-class temperature work at constant temperature, how many factories have hot pressing time, when to start up and when to stand by and keep warm. When hot pressing, you should bring your own tools such as release agent, scavenger and slag removal from the designated manufacturer. After the hot-pressing coil is demoulded, it should be left for a period of time before testing the pressure resistance. This is a process of testing products. According to different working voltages such as 3000V, 6000V and 10000V, the withstand voltage standard is set according to different requirements.
How to prevent the straight part or the curved part from being punctured and cracked is something that must be mastered during hot pressing. Our company has mastered some skills to repair the coil of high-voltage motor, and the skills to copy the coil after it is broken down and withstand voltage need to be learned for a period of time.
For pressure instruments, there are generally many products in Wuhan.
From winding the coil to embedding, it is usually necessary to make an extra coil for the following purposes:
1. Leave the technical data of this type of motor (wire diameter, turns, insulation thickness, straight line length, curvature, end length, lifting height, pitch angle, etc.). ).
2. If the coil is unqualified, please replace it.
High-voltage motors are generally 200 kW-2000 kW and weigh more than 3 tons. Suitable cranes can be designed according to their own conditions to facilitate motor maintenance. The stator and rotor of the motor are dusted (generally cleaned with a high-pressure water gun) and then put into the oven for baking. After cooling, decide whether to repair or overhaul the motor. When repairing the high-voltage motor, there is a set of coil tools, rotor wire bending tools and stator coil motion hot pressing tools. There are many similar gadgets that need to be made by yourself. The key is to combine technology with experience. How not to damage the primary coil is the key. It is time-consuming and laborious to take out the coil and reprocess it. Whether the old coil can be rebuilt is the key to saving time (generally, the procurement cycle of winding used in high-voltage motors is 1~2 weeks, which delays the repair time. These important issues need to be mastered in the follow-up research).
During minor repairs of the rotor, a series of procedures, such as how to take out the copper bars (aluminum bars) in the rotor, how to change the bars when taking out, how to make standard coils by bandaging, and how to conduct welding tests, are not discussed here. When overhauling the motor rotor, all coils must be taken out. How to get them and how to keep them in good condition is the key technology. For example, the high-voltage motor should be taken out as completely as possible. If the measuring tool is not damaged, you can save money and time when repainting. When the coil needs to be remade, it is a waste of time to calculate the wire gauge. When embedding the stator wire, it is usually pressed once every three coils to prevent the coils from discharging to the notches at both ends or the end rings at both ends, and the coil is damaged and discharged due to offline errors. The wiring, spacing, grouping, wiring, bandaging, star connection and lead-out after the whole coil is embedded are all carried out in accordance with the operating procedures of various grades of motors. Generally, the motor is sealed together after passing through a withstand voltage before the star sealing point, and three leads can be drawn out. There is also a special lead that connects the six leads into a triangle or star line. General leads need to be purchased from designated high-voltage cable manufacturers. After all the embedded wires are connected, the whole motor is completed after one withstand voltage. Parameter test of the whole machine: Henan brand-new adopts its own patented technology-magnetically controlled switching transformer starting test equipment, which starts various motors such as 380V, 660V,140 V, 3000V, 6000V, 10000V, etc., and the high and low voltage starting test capacity is1. All squirrel-cage and slip-ring motors can be used for no-load starting and no-load running tests. The test items include measuring current, voltage, speed, temperature and noise.