Making method for copper mouse cage rotor of high-speed motor

Abstract

The invention provides a manufacturing method for a copper squirrel cage rotor of a high speed motor; the method includes the following steps that: (a) a manufactured stainless steel rotor which undergoes heat treatment firstly has an oxide layer on the rotor surface removed by a mechanical method; (b) the stainless steel rotor, the surface oxidation layer of which is removed, undergoes the chemical or electrochemical treatment, and then is acid-washed in order to thoroughly remove oxides or other impurities on the surface of the stainless steel rotor; (c) the non-copper part of the stainless steel rotor is insulated and isolated, and then immersed in the solution the temperature of which is 30 to 50 DEG C and which contains copper ions with a certain concentration for the copper deposition treatment until the copper sedimentary deposit is filled in groove bodies of grooves which are arranged on the outer surface of the stainless steel rotor along the axial and the circumferential directions or slightly overtops the surfaces of the groove bodies; finally, the surface is polished by the mechanical treatment. In the invention, a pre-nickel plating step(C) can be added between the step (a) and the step (b). The manufacturing method of the invention has the advantage of closer combination of the copper squirrel cage and the main body of the stainless steel rotor of the motor; moreover, the copper squirrel cage rotor has the advantages of no heating, no faults and long service life when the copper squirrel cage rotor runs.

Description

【Technical field】 [0001] The invention relates to a motor, in particular to a method for manufacturing a copper squirrel cage rotor of a high-speed motor with a rotating speed of more than 80,000 rpm, no heat generation, no failures such as peeling off, and excellent comprehensive performance. 【Background technique】 [0002] The printed circuit board (PCB) needs to be drilled with a high-speed drilling machine before plugging and soldering electronic components, and the hole diameter is only a fraction of a millimeter or a few millimeters. The driving motor of its high-speed drilling machine is a special motor. By controlling the frequency of the power supply, its speed can reach 50,000 to 250,000 rpm, or even more than 300,000 rpm. The main shaft of the PCB drilling machine equipped with a special motor is the key component of the drilling machine. The main shaft is composed of the stator, rotor, bearing, air cavity, water cooling cavity and structural parts of the motor. ...

AI Technical Summary

Problems solved by technology

At the same time, the thermal expansion of the rotor caused by heat due to current loss, and due to the different expansion coefficients of copper and steel, tension will naturally be separated from each other at the junction of copper and stainless steel, which will eventually cause the outer diameter of the copper squirrel cage to expand, making the rotor and stator The gap between them is reduced, or even stuck, resulting in stalling and damage to the main shaft rotor

More serious may cause the copper squirrel cage to peel off from the stainless steel body

The above problems are all due to the fact that the squirrel cage cannot be closely integrated with the stainless steel during the production process, and an isolation layer is formed between the copper and the stainless steel.

The main reason is that there are defects in the manufacturing process. The reasons for this defect include: 1. There are impurities on the surface of the stainless steel body, or it has not been "activated"; 2. When copper is deposited on the surface of the stainless steel body, there is no "chelation" between molecules , Improper selection of process parameters; 3. In the process of forming the copper squirrel cage, the copper body is doped with other metals, such as iron, aluminum, silicon and other impurities, which cannot meet the actual required purity.

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