How to make a motor?
Motor manufacturing process content
1. Machining process: including rotor machining and shaft machining.
2. Iron core manufacturing process: the manufacture of punched sheets including magnetic pole cores and the lamination of punching sheets.
3, winding manufacturing process: including coil manufacturing, winding embedded and insulation treatment (including short-circuit ring welding).
4, squirrel cage rotor manufacturing process: including the rotor core stacking, rotor die casting.
5, motor assembly process: including the riveting of the bracket assembly, the main and auxiliary stator riveting and assembly of the motor.
1. The structure of a three-phase asynchronous motor consisting of a stator, a rotor and other accessories.
(1) Stator (still part)
1, the stator core
Function: A part of the magnetic circuit of the motor and the stator windings placed on it.
Structure: The stator core is generally formed by laminating and laminating a silicon steel sheet having an insulating layer on the surface of 0.35 to 0.5 mm thick, and a uniformly distributed groove is formed in the inner circle of the core for embedding the stator winding.
There are several types of stator core slots:
Semi-closed groove: The efficiency and power factor of the motor are higher, but the winding and insulation are more difficult. Generally used in small low voltage motors.
Semi-opening groove: It can be embedded with molded windings, and is generally used for large and medium-sized low-voltage motors. The so-called forming winding, that is, the winding, can be placed in the groove before being insulated. Open type slot: used to embed the formed winding, the insulation method is convenient, mainly used in high voltage motors.
2. Rotor winding of three-phase asynchronous motor
Function: Cutting the rotating magnetic field of the stator to generate induced electromotive force and current, and forming electromagnetic torque to rotate the motor.
Construction: divided into squirrel cage rotor and wound rotor.
1) Squirrel-cage rotor: The rotor winding consists of a plurality of bars inserted into the rotor slots and two ring-shaped end rings. If the rotor core is removed, the entire winding looks like a squirrel cage, so it is called a cage winding. The small cage motor adopts a cast aluminum rotor winding, and is welded by a copper strip and a copper end ring for a motor of 100 KW or more.
2) Wound rotor: The wound rotor winding is similar to the stator winding. It is also a symmetrical three-phase winding. It is generally connected in a star shape. The three outlet heads are connected to the three current collecting rings of the rotating shaft, and then passed through the brush and External circuit connection.
Features: The structure is more complicated, so the application of the wound motor is not as extensive as the squirrel cage motor. However, through the collector ring and the brush, additional components such as resistors are inserted in the rotor winding circuit to improve the starting and braking performance and speed regulation performance of the asynchronous motor. Therefore, equipment that performs smooth speed regulation within a certain range, such as Cranes, elevators, air compressors, etc. are used above.
(3) Other accessories for three-phase asynchronous motors
1. End cap: support function.
2. Bearing: Connect the rotating part and the moving part.
3. Bearing end cover: protect the bearing.
4. Fan: Cool the motor.
Second, the DC motor adopts an octagonal full laminated structure, which not only has high space utilization, but also can withstand pulsating current and rapid load current change when powered by a static rectifier. DC motors generally do not have series-excited windings and are suitable for use in automatic control techniques that require forward and reverse motor rotation. It can also be made with series excitation winding according to user needs. The motor with a center height of 100 to 280 mm has no compensation winding, but the motor with a center height of 250 mm and 280 mm can be made with a compensation winding according to the specific conditions and needs. The motor with a center height of 315 to 450 mm has a compensation winding. The shape and technical requirements of the motor with a center height of 500-710mm are in line with IEC international standards, and the mechanical dimensional tolerances of the motor comply with ISO international standards.