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What are the requirements for motor core press-fitting technology
The motor core is one of the effective parts of the motor, and the manufacturing process of the motor core has a great influence on the running performance of the motor. The manufacturing process of the motor core includes two parts: punching manufacturing and core pressing. The following precision to introduce the motor core press-fit technical requirements.
According to the different pressing methods, the structure of the motor core can be divided into two types: external pressing and internal pressing. The iron core of small motor usually adopts external press fitting, and the iron core of medium-sized motor can adopt internal press fitting or external press fitting.
When the motor iron core is externally press-fitted, it is positioned with the inner circle of the punching sheet, and the punching sheet is stacked on the press-fitted expanded tire and inserted into the surrounding grooves at the same time.3-4Root groove-like rod. First pressurize to expand the tire, so that the inner circle of the iron core is expanded. Then press the iron core tightly, put the buckle into the dovetail groove to support it tightly, and then bend the two ends of the buckle to buckle the end face of the iron core, so that the iron core becomes a solid whole. Finally, release the pressure of the hydraulic press, disassemble the expansion tire, and take out the iron core.
The advantage of the external press-fitting process is that the motor core press-fitting and the base processing can work independently.;Embedded line convenience;Dipping paint and drying equipment utilization rate is high, and save insulation paint. The disadvantage is the need to expand the tire. The inner press-fit motor iron core is formed by laminating the punched sheets in the machine base. An axial column pin and several arc keys on the core rib of the motor are used to fix the motor core, so that the motor core will not move in the circumferential and axial directions.,
Finally, put the machine base on the worktable of the hydraulic press, press the motor iron core tightly, put it into the arc key, and weld the arc key firmly with the pressing ring by electric welding, so that the iron core is firmly fixed in the machine base. The advantages of the internal press-fitting process are that there is no need to press-fit inflated tires, there is no pigeon tail groove on the outer circle of the punching sheet, and the punching die structure is relatively simple.;The winding is in the frame, insulated and timely, and the end is not easy to wear. The disadvantage is that the inner circle of the iron core must be coaxiality with the frame stop.;Embedding is inconvenient;During insulation treatment, the equipment utilization rate is low and the insulation paint is wasted more.
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