What is Slip Ring, Types Working, Applications

Hello, friends, I hope all of you are enjoying your life. In today’s tutorial, we will discuss what a slip ring is. The slip ring is such a tool that enables the transmission of electric power and signals from the static network to the rotatory. It is used for any electromechanical network in which signal and power are transmitted due to rotation. A slip ring can increase mechanical performance in a short network process and remove such wires, which are likely to be damaged.

Slip rings can deliver nonstop or alternating revolutions during the transmission power and data-shortening process, improving device performance and removing the risk of damage to electrical wiring in the moving portion. In today’s post, we will have a look at its working, construction, types, and some other factors. So let’s get started with what a slip ring is

What is a slip ring?

• The slip ring is also known as the rotatory electric device, such as connectors that can rotate, spinners, or electric rotary connections.

• This device is mostly used in wound rotor motors, which are a type of induction motor, generators, AC networks, packing machines, cable rollers, and wind generation turbines.

• This component is mostly used for rotary devices for the transmission of energy, used in control circuitries, and for analog and digital applications used in fluid dynamometer instruments, rotary beacons (a beacon fitted on the airports to specify the airport’s location to the pilot during nighttime), telescopes that use radio waves, or heliostats (such instruments that consist of a mirror, and when it rotates, it reflects the light of the sun to the specified location).

• A slip ring is a technique that makes an electric linkage by rotatory connections.

• Officially, it is an electrical power transmitting module that permits the movement of power among 2 electric rotatory portions, like in a motor.

Slip Ring Construction

• Normally, the slip ring comprises static graphite contacts (brushes) which scrub (rub) on the external diameter of a revolving metal ring.
• When the metal ring rotates the current or the electrical signal is transmitted to the ring by the static contacts.
•  This simplest assembly has been used for years as a basic technique of flowing current into a rotary instrument.

  Slip Ring Types

• Many types of slips rings are described here.

Mercury-Wetted Slip Rings

• This type of slip ring is famous for its lower resistance value and fixed joining (connection); it uses many methods that swap the sliding brush connections with a fluid metallic material molecularly attached to the links.

• During rotary motion, the metallic fluid keeps the electrical connection between the static and rotary joints.

• Due to the use of mercury, we have to take some safety measures, because it is a poisonous liquid.

• If this slip ring is working in an environment where food production is happening, the use of mercury should take some special precautions.

• Seepage of the mercury and the subsequent uncleanness could be very serious.

• This slip-ring expedient is also restricted by temperature, as mercury coagulates at almost minus forty degrees.

Pancake Slip Rings

• This type of slip ring consists of many conductors, which are assembled on the smooth disc-like concentric rings positioned on the rotary shaft.

• Such a type of arrangement is bulky and has a larger volume for similar circuitry, high capacitance and crosstalk, higher brush attire, and further gathers wear wreckage on its perpendicular axis.

• However, a pancake provides a reduced axial span for many circuitries and so can be suitable in some applications.

Wireless Slip Rings

• This type of slip ring does not use metal and carbon brush contacts to transmit power, as this method is used in older slip rings.

• Instead, the wireless slip ring transmits power by an electromagnetic field, which is generated by the windings, which are located in the rotary receiving point, and the static transmitter device.

• Wireless slip rings are a more advanced form of slip rings, as they do not use conventional methods to transmit power, so they are good for difficult working conditions and they need less power.

• But there is a disadvantage that it transmits less amount of power than other slip rings of a similar size.

Slip Ring in Induction Motor

• The wound motor is the type of induction motor; it uses a slip ring to increase the resistance of the rotor windings, not for the power transfer.

• The wound rotor used 3 slip rings, which are constructed from copper or a lot of copper. These rings are connected to the shaft of the motor.

• These three slip rings are joined with the 3 phases with the rotor’s windings.

• The slip rings are connected with carbon brushes to reduce friction. These brushes are connected with such devices that vary the resistance like a rheostat

.

Alternative Names of Slip Ring

• There are many names for the slip ring-like commutator, collector ring, rotary electric contacts, and electric slip ring.

• But its name, commutator, is mostly used for DC motors and generators.

• When it is used in higher-speed or less-friction applications, it is known as the rotary transformer.

Slip Ring Applications 

• The slip rings are used in the rotating unit to work with the device, normally denoted as a rotating joint.

• The work that is done by the rotary unit in the fluid is similar to the slip ring for the electric power.

• They are frequently combined into rotating units to transmit power and data to and from rotary apparatus in combination with the medium that the rotating unit offers.

Difference between Slip Ring and Split Ring

• These are some differences between the split ring and slip ring.

How Do Slip Rings Work?

The slip ring comes with static graphite or metallic contact that rubs on the rotating metallic ring. When the ring moves, current or signal is transmitted through a static brush to the metallic ring to make the connection.

Faqs