The slip ring is of a ring connected center conductor, a ring of the outer layer of the cables as shielding ring. Transmission signals above 12 MHz usually used coaxially shielded slip ring, the cross section of this kind of slip is shaped groove, is essentially rectangular coaxial conductor, and a capacitive intermediate frequency slip ring, center conductor is circular, supported by insulating pad in the shielding layer. Intermediate frequency slip ring is the slip ring assembly used to transmit the radar intermediate frequency (tens of MHz) signal and the energy. This kind of slip ring`s frequency is higher; transmission below 12 MHz can use ordinary slip ring.
Low frequency slip ring is the slip ring assembly by sliding contact to transmit the low frequency signal and the energy. Usually slip rings have two kinds of cylindrical slip ring and differential slip ring. Cylindrical slip ring`s conductive ring is divided into flat ring and V-ring. The conductive ring material is usually copper, brass, coins, silver, and gold, brush has alloy of palladium and gold or gold-plated line brush and copper graphite synthesis brushes.
The slip ring assembly electrical performance: insulation resistance, contact resistance, dielectric strength and crosstalk. For the IF slip ring should also be considered shielding, impedance matching, noise voltage, etc. because of the high frequency. On structure design first to ensure reliable contact, to ensure that all lines turned on continuously, therefore, request electric conductivity of the brush material is good, the pressure of slip ring should be appropriate, the slip ring`s eccentric and shaking amount is small, good wear resistance, low friction torque, and easy to maintain.
The structure types of through bore slip ring: according to the requirements of installation, can be divided into the type of shaft and through-hole type.
What important technical parameters are required to provide when choosing slip ring: 1. Rotation speed. 2. Circuit paths, the signal channel (circuit, ring and the number of channels are synonymous, if there is a loop or the ground, then it is a separate circuit, some slip ring`s one circuit can be used by other paths, so calculated only once). 3. Power circuit, the maximum voltage of the signal circuit and the maximum current. 4. Working temperature. 5. Protection grade (namely, sealing requirements).
Conductive slip ring have signal anti-jamming measures?
Answer: The precision conductive slip ring is a small space, and traces fairly dense member, various signals are concentrated within a slip ring, the mutual inductance and mutual capacitance effect between the respective signals are bigger. Because the slip brush and ring path contact point can not shield, the interference is particularly serious. Nowadays technology, comprehensive considered from the structural design of the slip ring and the slip ring internal wiring design, can completely avoid the problem of interference between power and signal, and interference between signals, and can prevent the outside electromagnetic interference of the slip ring internal.
Which signals can be transmitted by the slip ring:
Slip Ring can now transmit all popular medium and low frequency signals, and the bus control signal, etc.
Such as: Inter Bus, Can-Bus, Profibus, RS422, RS485, PLC control, digital / analog video, digital audio, Gigabit Ethernet, temperature, weight sensor signal, and so on.
Now many slip rings are used in the field of defense and military, such as reconnaissance aircraft equipment, air defense radar, artillery systems, early warning antenna, and the missile test system.