Regardless of the high-voltage or low-voltage motor, the temperature limit of the motor winding is related to the winding insulation grade, and the corresponding relationship is as follows: Class A105 C; ; Class e120 c; ; Class b130 c; ; Class f155 c; ; Class h180 c; ; Class c, 180 C or above.
Extended data:
Maintenance process of high voltage motor
Wind the thread in.
According to the voltage level, the high-voltage motor adopts various specifications of winding flat wires, such as bisimine, monoimine, thin double-stranded wire and so on. After the materials are prepared, they can be wound into shuttle rings on the winding machine. Generally, the shortest straight part of motor coil is 25cm, and the largest straight part is1.2m. The winding can be single flat winding, single vertical winding, double flat transposition winding or double flat transposition vertical winding, which is determined according to specific requirements.
Circular enameled wire coils can also be wound by using a universal regulator in the disc. The winding machine is equipped with a speed regulating motor and a worm gear reducer, which drives the winding machine to realize 0- 120 rpm forward and reverse braking.
It can count up and down. Generally, all kinds of motor coils within 1600KW can be wound, and a set of simple tensioner can be equipped to control the tightness of the wound coils. General maintenance manufacturers can choose the above products. If you encounter particularly large specifications, you can choose special winding equipment.
Preformed dressing
After the high-voltage motor shuttle coil is wound, it is wrapped with insulating materials such as shrink tape and yellow wax tape to protect the external insulation, interlayer insulation and turn-to-turn insulation of the coil from being damaged. When pulling the machine, it is not rubbed by the mold fixture and the nose pin to prevent looseness and deformation.
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.
Forming/shaping
Forming machine, expanding machine and wire drawing machine are actually a kind of machine. Its main purpose is to draw a vertical winding shuttle coil or a flat winding shuttle coil wound by a winding machine into a frame coil. The frame coil is based on the inner circle and the outer circle of the motor stator core to form a centripetal inclined coil. It takes two technicians to wind the shuttle coil, but generally it takes three people to pull (unfold).
. Before drawing, according to the actual situation of the repaired motor, draw the shape of the coil with a computer and make it into a template to adjust the wire drawing machine. Those who can't draw generally use old coils as templates to adjust the drawing machine. The four clamps of wire drawing machine have up, down, left and right adjusting mechanisms, and the adjusting clamping mechanism locks the coil to enter the drawing process.
Do plastic surgery
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.
Baidu encyclopedia-high voltage electric machinery