Electrified turning method of exciting current-collecting ring of frequency-conversion synchronous motor

Abstract

The invention relates to an electrified turning method of an exciting current-collecting ring of a frequency-conversion synchronous motor. A motor and connecting machinery are separated and uninstalled by adopting insulation and prevention measures on a high-precision lathe, a motor speed control program is changed, the given speed of the motor is reduced, and the field electrified turning machining of the exciting current-collecting ring of the motor is realized by utilizing the low-speed stable rotation of the motor. The turning and sanding to a deep grinding scratch of the current-collecting ring are finished just in 12h under the condition of not detaching a rotor, and the precision requirement is achieved, therefore, the wearing capacity of an electric brush is reduced to a great extent, the replacement and maintenance capacity of the electric brush is remarkably reduced, not only the grinding scratch defects of the current-collecting are overcome and the safety operation of the device is ensured, but also complex works of motor removal and rotor pull-out and conveying are avoided, the repair time is shortened, the expense is reduced, and powerful conditions are created for continuous-rolling yield increase.

Description

technical field [0001] The invention belongs to the field of mechanical equipment processing, and in particular relates to a method for on-site electrified turning processing of an excitation collector ring of a main drive variable-frequency synchronous motor of a large-scale finishing mill. Background technique [0002] At present, the 2150mm strip steel production line of my country's continuous rolling mill is generally composed of six finishing mills, which are driven by six motors respectively. Most of the main drive motors of this finishing mill are 10,000KW synchronous motors jointly manufactured by domestic and foreign motor manufacturers. This synchronous motor is the largest among the motors used by domestic strip steel manufacturers. After more than a year of operation and use, the other conditions of the motors are normal, but the inner and outer rings of the collector rings of the six motors have different degrees of deep wear marks and concave-convex burn marks...

AI Technical Summary

Problems solved by technology

And this approach is extremely difficult

Because the motor rotor and the collector ring are thermally installed, it is difficult to grasp the collector ring from the rotor. Even if it is grasped, the reinstallation requires a special heating furnace and a special installation process. Therefore, this method There is no advantage, but the danger is greater

[0004] However, there are also several major problems in the on-site live turning: firstly, the collector ring is charged when the motor is turned, and a slight negligence will cause the collector ring to be grounded, resulting in a major accident; secondly, the rotation of the motor is not controlled by the turning worker when turning. If you cannot stop quickly and accurately in case of an emergency, it is very easy to damage the car manufacturing equipment and personnel; thirdly, the turning objects generated during turning will rotate with the motor, which is easy to cause grounding and firing

In addition, the collector ring has a high voltage during turning, which directly threatens personal safety.

Therefore, there are no precedents and written records of on-site live turning of motor slip rings so far.