What is slip ring contact resistance

    Dynamic resistance of the slip ring is the dynamic contact resistance between the electric brush and ring body can be measured by Micro ohm Micro voltmeter table. It is normally a fluctuation value, mainly due to the defective on the surface of the metal ring of the slip ring or between the ring and the brush has the foreign body, the pressure is not enough, virtual contact causes, etc. Because the surface treatment can not be absolutely smooth, Precision Slip ring products are cutting-edge military technology was only in recent years, everyone is familiar with the major industry has been widely used. As every industry use of slip ring in different environments, different type of signals, then there are not uniform with important performance parameters for production of the structure size, performance and life requirements. But the slip rings have main performance parameter will influence the production of stability, reliability, and life. This article summarizes the factory of actual production which use Slip ring of the import parameters for working process, and have general summary of key points.so the fluctuations value of the slip ring`s dynamic contact resistance can not be eliminated, generally requires that can not exceed 10 milliohms, minimum can be reached 1 milliohm. The fluctuations value of slip ring`s dynamic resistance will affect the slip ring`s signal transmission accuracy, so when purchasing the raw materials is necessary to strictly control the plating treatment of the metal ring surface, in production must carry strict requirements on the contact surface cleaning and the pressures of electric brush and metal slip ring. The pressure of the contact surface of the conductive ring should be controlled between 10-15 GF.

    First, the structural safety of Slip ring design:
    Electrical Slip ring are made up slip ring body, brush assembly, the combination of frame, concentric precision ball bearings. It adopt to multi-channel precision positioning Ring Ring module, vacuum pressure casting ring in the ring epoxy resin formulations at a high temperature curing material after the precision machining. pancake slip ring is a double brush II design , with the highest quality of gold alloy slip ring as the ring groove and the corresponding body symmetric double contacts, use of the electrical brush of flexibility pressure sliding contact with the ring groove to pass signals and current, thus ensuring the adequacy of exposure and durability.
    Engineers must be considered to users many factors when design the production, example: mechanical installation, performance requirements, reliability, product life speed, current, voltage, temperature, vibration, protection degree and signal type when design the production, and also important to focus on the slip foolproof ring product manufacturing reliability.

    Second, the manufacturing process.
    As per above mentioned, the capsule slip ring is a double-brush II design with the highest quality of gold alloys as a slip ring body, and the corresponding symmetric double-ring groove contact position, using the brush pressure of flexibility and V ring groove sliding to contact, then transmit signals and current. in the manufacturing process have following three points must be strictly controlled. 1. Adjust the wire brush contact with the ring groove is best to make a good wire brush on the pressure in the ring groove, and will not affect the rotation, if adjust pressure is too small will result can not be contact. the pressure is not enough, or too much pressure will increase the friction torque, make contact position have a large wear, it made shorten the life for slip ring. 2. Workshop environment to shorten the life reach a certain leval of cleanliness will result in a dirt ring groove surface adsorption can also cause false contact or resistance value in creases. 3. Ring groove in the pre-production process can not be subject to external quality materials to withstand external shocks or gravity will be deformed, Shenzhen MOFLON material used in the process of working iron box filled with packing foam cushioning the impact of cotton to control the external gravity . 4. It is very important to choose the material, it must be have good thermal conductivity, high melting point (temperature) , high conductivity, temperature coefficient of resistance is small, fast signal transmission frequency bandwidth also need to have anti-curing materials, antioxidants, anti-corrosive gases, high temperature super-wear and other physical characteristics, can not just use low-cost materials or do not have the above characteristics of slip ring life will be greatly reduced, MOFLON uses of expensive gold alloy to ensure high-quality long life slip ring products.
    Third, the slip ring performance parameter testing.
    Parameters of the slip ring detection can be reflect the overall performance of slip ring connector and solution the some problem immediately. test parameters, including the appearance of the product structure inspection, slip ring normal life testing, static contact resistance, the dynamic contact resistance, insulation resistance, electric strength and the friction torque detection, here introduced the electrical slip ring normal wear life of insulation resistance, the dynamic contact resistance were detected and analyzed.

    1.The detection of dynamic contact resistance
    To be bested for slip ring mounted on 360-degree turntable rotation detection by motor driven turntable, so that a continuous conductive slip ring rotation in the detection process, the dynamic contact resistance of each loop is a dynamic display whichever is the maximum and minimum, in order to ensure the stability of the loop conductive transfer, the loop of contact resistance variation of no more than 9m.
    2.Insulation resistance testing:
    To prevent the loop between the insulation resistance should be not less than 500M, MOFLON produced the electrical slip ring is a multi-channel precision positioning ring group ring, vacuum pressure casting epoxy formulation materials, precision machining, after heat curing made.
    3.The slip ring life testing:
    rotary slip ring is used in point-contact throughout the manufacturing process to ensure that the brushes and ring groove wear life, MOFLON purchased Chinas first slip ring tester, according to the different use of the environment (high temperature, voltage, speed, frequency, data rate), can be test to life for electrical slip ring in different environments. Each batch of material produced will have a strict life test for 15pcs/5set sample in 21 days in advance, then make sure the production of wear life and quality .
    After learn about the slip ring manufacturer process to grasp the importance of points and made the manufacturing process some of the key parameters required, MOFLON as the countrys first specialized in electrical slip ring manufacturers, and have enough design experience , manufacturing experience, also collected and accumulated many goods suggestion from customers to fill the gaps in the field. In order to best service for our customers, we are very pleasured to work with global partners in the field to carry out more extensive cooperation, achievement partner, client-side products to achieve greater value creation .Monofilament precious metal electric brush improved the shortcomings of the composite metal electric brush, small debris, small volume, the stability of the signal transmission is good, but the carrying capacity is very limited. Fiber brush electric brush`s design uses a plurality of metal fibers, and to maintain a multi-point contact with the metal ring body, and having excellent electrical conductivity and high current density. And the environmental sensitive requirements in the fan cabin are much lower than other several types of contact.

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