Application of the motor manufacturing process an important part of the core punch

  First, the type of punch
In order to facilitate the study of the structure and process of the motor core, according to the shape of the punch is divided into circular punch, fan-shaped punch and magnetic pole.
1. round punch
Is the AC motor set, the rotor punch and the DC machine armor punch. The maximum width of the electrical steel plate is 1200 mm, considering the machining allowance at the time of punching, the diameter of the whole round punch sheet is Φ 1180 mm.
Small asynchronous motor stator punch, the outer circle with a pigeon tail groove, so that when the core installed in the installation of fasteners, the punch will be tightened into a whole.

Small asynchronous motor rotor punch. The rotor punching hole has a keyway (its angle is marked) and the balance groove. The balance tank is designed to reduce rotor unbalance
Medium-sized AC motor built-in pressure structure of the stator punch, is directly stacked in the base of the whole round punch.
DC motor armature punch with axial vent (AC motor also has this structure punch). The slot of the armature flap is not equipped with a groove of the groove, but there are two different diameter of the core of the punch, the smaller diameter of the set in a certain position, embedded in the small diameter after the core Seal on the non-magnetic wire or non-worn glass ribbon to fasten the pad or winding.
Fan slice
Turbine generators, hydro-generators and other large and medium-sized motor core diameter of more than 1180mm, are required to use fan-shaped pieces. Consider the use of materials and the status of existing equipment, and some small motor stator core also uses fan-shaped structure.
1) stator fan-shaped punch
Although the shape of the film is similar to the shape of the fan, but because of its different ways to have a variety of different forms of appearance. Common two kinds of stator fan-shaped red.
2) Rotate fan-shaped punch
Rotor core diameter greater than 1180mm, the use of fan-shaped pieces assembled. Fig. 6 shows the even-numbered slot rotor fan (α is the angle between adjacent grooves and z is the number of slots per sector). For the odd trough rotor fan. Commonly used three kinds of rotating armature fan structure.
3. Magnetic grade punching
Figure 9a is a main magnet of the DC motor, b, c for the rotating magnetic pole pieces, d, e for the eddy current brake magnetic pole (1 ~ 2mm) A3 or 16Mn steel plate punching, PunchingSecond, the technical requirements of the film
1. Size accuracy There are many sizes on the punch, which can be classified as "internal size" and "fit size". The size of the internal dimensions such as groove size, ventilation holes, marking slot and the magnetic pole on the aperture size, etc., generally use H10, higher accuracy level is not necessary, because the punching sheet, the outbound caused by the error, Far greater than the error of the punch itself. Punching the inner circle, the outer circle and the shaft hole and other parts with the "fit size", the choice of precision grade and the processing technology used.
The accuracy of inner and outer diameter of stator and rotor plate of small and medium - sized asynchronous motor is related to the way of loading and unloading. General external pressure stator punch, the diameter of the general use of H8, diameter accuracy and to ensure that the stator coaxial degree of the process program.1) "light cylindrical" program in the outer diameter of the blank to leave 0.5mm processing margin, the accuracy of H8 or H9.
2) "two not only" and "light only mouth" program punch the outer diameter of the tolerance, according to the accuracy of punching and the core to determine, because the core pressure, the outer diameter size tends to increase. Therefore, the upper limit of the outer diameter tolerance of the punch is 0.035 to 0.045 mm (0.035 mm smaller) than the upper limit of the outer diameter of the core, and the lower limit thereof is generally determined according to the H7 tolerance. Table 1 lists the JO2 series of external pressure small asynchronous motor stator plate and core diameter tolerance.
Built-in pressure stator punch general diameter H7, diameter using H8. Table 2 lists the inner diameter of the stator core.
2. punching burr
1) stator punching is generally controlled within 0.05mm. For the individual parts of the complex (length of about 30mm) control within 0.12mm, but should be burr treatment, after treatment should be within 0.08mm.
2) rotor punching glitch control within 0.07mm, individual groove parts do not allow more than 0.10mm.
3) For the paint after the punching of the punch, the burr shall not be greater than 0.05mm.
3. Punching warp
After punching, there will be different degrees of warping, single slot punching punching plate value is greater, especially the closed slot of the rotor punch, single slot punching, warping more serious, Diameter of 230mm or less are not allowed to more than 2mm, 230mm or more do not allow more than 3mm.
4. The inner circle or shaft hole and the outer circle of the coaxial degree of the inner and outer circle once punching, the general control in the 0.04 ~ 0.06mm or less, when the inner and outer round punching twice, the coaxial should be appropriate to relax.
5. The difference between the maximum and minimum tooth widths of the punching groove is not consistent with the stipulations of the drawings and the relevant process documents. If there is no express provision, refer to 3 or 4 in Table 3 Accuracy test.
Some factories require the difference between the size of the flow of teeth does not exceed 0.12mm, fixed size teeth difference of not more than 0.2mm.
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6. Slot center line should be through the center, there should be no obvious skew phenomenon, check the positive and negative two shaft hole (or outer diameter) aligned to the end of the groove after the distance between the two teeth is not greater than 0.8 Mm.
7. Punch the surface insulation layer should be thin and uniform, there is enough dielectric, oil, moisture and adhesion performance.