Motor rotor finishing requirements
The finishing of the rotor refers to the outer circle of the rotor of the finished car, which is a key process to ensure the accuracy of the air gap of the motor and the performance of the motor. Any defects in this process are ultimately manifested by uneven air gaps, which have a serious impact on motor performance. Today, Xiao Bian focuses on the finishing requirements of the rotor and how to improve the work efficiency.
Rotor finishing requirements
The key points of the refined car rotor. The requirement of the finishing car is that the outer circle of the rotor and the bearing position should be coaxial; the dimensional accuracy and roughness of the outer circle of the rotor must conform to the pattern specification; the punching piece should not have inverted teeth, and the core tooth should not have axial tilt.
The fine car rotors are generally turned on a horizontal lathe with a precision turning tool. In order to prevent the punching of the punching teeth, the cutting edge should have a larger front angle to make the turning sharp. The radial cutting resistance is reduced. As with the inner circle of the finished stator core, the cutting speed and the depth of the knife should not be too large, and the amount of the cutter cannot be greater than the thickness of the single sheet to avoid excessive stress and damage the punch.
Since most of the rotors of small and medium-sized asynchronous motors use semi-closed slots, the rotor conductors are cast aluminum. When turning, the turning tools alternately encounter hard silicon steel sheets and soft aluminum strips. Intermittent cutting and faster tool wear. The precision of the outer circumference of the rotor is not high. Tool sharpening and adjustment are frequent and become a weak link in the automatic machining line.
In order to ensure the cutting quality and productivity of the outer core of the rotor core, the special rotor for external machining of the rotor of the motor and the advanced carbide turning tool are used for finishing. This machine tool is a highly ergonomic automatic lathe with automatic measuring device and automatic compensation mechanism. It can automatically measure during the cutting process. It can compensate the positive and negative direction for the thermal expansion and blade wear of the cutter during high-speed cutting. Guarantee the stability of the workpiece size.
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