What will affect the service life of the conductive slip ring?
January 5, 2019
1. Material of Slip Ring
Precision Conductive Slip Rings Generally, steel collector rings have good wear resistance and high mechanical strength, so they are mostly used in synchronous motors with large difference in wear of the collector rings due to polarity.
Steel can be processed into a complex structure, which is an easily available and inexpensive material, so it is widely used in synchronous motors including hydroelectric generators with lower peripheral speeds. For a steam turbine generator, a power collecting ring that emphasizes mechanical strength and wear resistance at a high peripheral speed is sometimes used, and forged steel is sometimes used.
In the cooperation between the collector ring and the brush, when the abrasiveness of the brush is too strong and the material of the collector ring is too soft, step wear corresponding to the brush width occurs on the slip ring. Especially the high-temperature and low-humidity totally enclosed motor is more likely to cause excessive wear of the brush or the collector ring.
When corrosion resistance is required, stainless steel can be used, but the sliding characteristics of stainless steel are unstable. If the combination with the brush is not suitable, the brush will be bounced, and the temperature rise of the brush may be too high or abnormal wear, so care must be taken when using it.
2. Assembly Process of Slip Ring
Custom-made slip rings first require integrity and correctness in the design of the product design, analysis of the structural and technical aspects of the product, and the assembly relationship between the slip ring and the installation equipment.
Secondly, under the premise of guaranteeing the quality of the slip ring, we strive to improve its quality to achieve the service life of the slip ring.
Finally, the parameter detection of the conductive slip ring can better reflect the comprehensive performance of the conductive slip ring and find the solution in time. The detection parameters include product appearance structure detection, conductive slip ring normal life detection, static contact resistance, dynamic contact resistance, and insulation resistance. , electric strength and friction torque detection.
3. Working Speed and Wear Resistance of Slip Ring
The conductive slip ring itself does not have a speed, and its own torque is small, and the mechanical device is used to drive the slip ring to rotate. According to the working speed of the customer's mechanical equipment and the internal structure and performance characteristics of the conductive slip ring, the operating speed of the slip ring of different structure types is different. When using the slip ring, the working speed of the mechanical device cannot be greater than the setting speed of the slip ring, otherwise the slip ring will be affected. The service life. For example, the maximum speed of the hollow shaft conductive slip ring is the highest working speed under the statistical unit per minute. Under normal conditions, it can not work for the long time at the highest speed. Otherwise, the working life of the slip ring will be shortened. When the speed is working, in addition to greatly affecting the life of the slip ring, it will greatly affect the accuracy of the transmitted signal, resulting in increased signal noise and more serious signal distortion, which can easily damage the slip ring.
The wear resistance of the collector ring in the motor collector ring directly affects the service life of the motor. The material of the collector ring requires mechanical strength and is a good conductor of electricity. It must also have corrosion resistance. When it comes into sliding contact with the brush, it must have wear resistance and stable sliding contact characteristics. In general, steel collector rings have good wear resistance and high mechanical strength, so they are mostly used in synchronous motors with large difference in wear of the collector rings due to polarity.
4. Working Environment factor of slip ring
Although the service life of the conductive slip ring has a lot to do with the manufacturer's production process and production materials, in many cases, the correct use of the slip ring also determines the life of the slip ring. Generally speaking, the use and A well-maintained slip ring has a service life of 5 - 10 years. Conversely, if it is used for a long time in a humid, high temperature, high pressure, corrosive environment, the life of the slip ring is greatly reduced.
Therefore, when using the conductive slip ring, it is best to place it in a place where it is ventilated and away from high temperature and high pressure, thus avoiding unnecessary waste and normal maintenance of the equipment.