Mechanical processing of motor parts;
Manufacturing process of iron core;
Winding manufacturing process;
Manufacturing technology of squirrel-cage rotor;
Manufacturing technology of commutator, slip ring and brush device;
Motor assembly technology.
Typical structure of motor
Machining of motor parts
Interchangeability of motor parts
Center height (height h from the center of the shaft to the foot plane);
Shaft extension diameter d and length e, keyway width f and shaft groove depth g;
The lateral center distance a of the foothills and its distance a/2 from the center line;
The axial center distance b of the foothold and the distance c from the shoulder to the first foothold;
Foot hole diameter k;
Stator inner diameter and rotor outer diameter;
Matching size of end cover and base stop;
Matching dimensions of bearing, bearing seat and bearing chamber;
Matching dimensions of external fan and external slip ring;
Machining of motor parts
The air gap of the motor has great influence on the electrical performance of the motor;
The structure of motor end cover and frame is rigid, which is easy to deform during machining and clamping.
The accuracy of general motor structure size is IT6 ~ IT11;
Machining of motor frame
Type of motor base
Cast iron frame;
Die-casting aluminum alloy frame;
Steel plate welding machine seat;
Technological scheme of machining motor frame
Taking the stop and the end face as the positioning reference;
Machining other parts with foot plane and foot hole as positioning;
Machining of motor end cover
The end cover supports the rotating part of the motor and determines the relative position of the stator and rotor of the motor, so the stiffness, dimensional accuracy and shape tolerance of the end cover will affect the air gap uniformity between the stator and rotor.
The key points of machining are to ensure the accuracy of the end cover stop and bearing chamber, the coaxiality between them and the circular runout of the end face to the axis;
At present, the commonly used machining schemes are one-time clamping and two-time clamping;
Machining of motor end cover
Shaft machining
The shaft is one of the key parts of the motor.
Supporting the rotating component, transmitting torque and determining the relative position between the rotating component and the stator;
The shaft should have reliable strength and stiffness;
At the same time, the processing requirements for the shaft are higher;
Shaft machining
Iron core manufacturing process
Core press-fitting and its characteristics
External press fitting;
Internal pressure loading;
Iron core manufacturing process
Quality key point
The method of constant weight, constant pressure and fixed length is adopted to ensure the quality of iron core.
Accumulation coefficient Kfe
Hot rolled silicon steel sheet 0.95;
Cold rolled silicon steel sheet 0.97;
Winding and embedding technology
The life and operation reliability of the motor mainly depend on the motor winding and insulation treatment process!
The cost of motor winding accounts for 20~40% of the total cost of motor!
Winding and embedding technology
Insulation treatment process