The slip ring is a ring connected to the center conductor, and a ring connected to the outer layer of the cable as a shielding ring. Coaxial shielded slip rings are usually used to transmit signals above 12 MHz. The cross-section of this slip ring is groove-shaped, which is essentially a rectangular coaxial conductor. There is also a capacitive intermediate frequency slip ring. The center conductor is a ring Shaped, supported on the shielding layer with insulating pads. The intermediate frequency slip ring is a slip ring assembly used to transmit radar intermediate frequency (tens of megahertz) signals and energy. This kind of slip ring has a higher frequency, and ordinary slip rings can be used for transmission below 12 MHz.
Low-frequency slip rings are slip ring components that use sliding contacts to transmit low-frequency signals and energy. There are usually two kinds of slip rings: cylindrical slip ring and differential slip ring. The conductive ring of cylindrical slip ring is divided into flat ring and V ring. The material of the conductive ring is usually made of copper, brass, coin silver and gold, and the brushes include palladium, gold alloy or gold-plated wire brushes and copper-graphite synthetic brushes.
The electrical performance indicators of slip ring components are: insulation resistance, contact resistance, dielectric strength and crosstalk. For intermediate frequency slip rings, due to the high frequency, shielding, impedance matching, noise voltage, etc. should also be considered. In terms of structural design, it is first necessary to ensure reliable contact and continuous connection of all lines. Therefore, the material used for the brush is required to have good electrical conductivity, the pressure on the slip ring should be appropriate, the eccentricity and shaking of the slip ring are small, and the abrasiveness Good, low friction torque for easy maintenance
Cylindrical slip ring structure types: according to installation needs, it can be divided into shaft type and through hole type
What important technical parameters should be provided when selecting a slip ring: 1. Working speed during rotation. 2 circuit channels, signal channels (circuits, rings and channel numbers are all synonymous, if there is a loop or ground, then it is a separate circuit, some slip rings can be used by other circuits, so it is only calculated once ). 3. The maximum voltage and current of the power circuit and signal circuit. 5. Working temperature. 6. Protection level (both sealing requirements)
Do conductive slip rings have signal anti-interference measures?
Answer: The precision conductive slip ring is a component with small space and dense wiring. All kinds of signals are concentrated in the slip ring. Because of the mutual inductance and mutual capacitance effect between the signals, the sliding brush and the ring track are in contact. It cannot be shielded everywhere, and the capacity coupling is especially serious. The current technology, considering the structural design of the slip ring and the internal wiring design of the slip ring, can completely avoid the interference between the power and the signal, and the interference between the signal and the signal, and can prevent the electromagnetic interference from the outside to the inside of the slip ring.
What signals can the slip ring transmit:
Now the slip ring can transmit all the popular medium and low frequency signals, bus control signals and so on.
Such as: Inter Bus, Can-Bus, Profibus, RS422, RS485, PLC control, analog video, digital audio, Gigabit Ethernet, temperature, weight sensor signal, etc.
Now many slip rings are used in national defense and military fields, such as reconnaissance aircraft equipment, air defense radar, artillery system, early warning antenna, missile test system.