The SR20M_/R360/X2 Slip Ring Assembly has 20 slip ring circuits, an integrated resolver, and a Type M (2.000″ diameter) rotor.
- 20 slip ring connections
- Resolver rotation sensor
- Type M (2.000″ diameter) rotor
- Bendix PT stator and rotor connectors
- Instrumentation quality rings & brushes
- Sealed, corrosion resistant metal housing
- Lightweight and compact
The SR20M_/R360/X2 Slip Ring Assembly is used when a slip ring and/or a rotation sensor needs to be mounted at the end of a rotating shaft. The gold alloy slip rings are used to make high quality electrical connection to strain gages, thermocouples, or other sensors that have been installed on rotating machinery. Current capacity is 0.5A per connection and the maximum peak resistance variation is 0.1 ohm. The rotation sensor is used to measure rotational velocity, angular position, and direction of rotation. The rotation sensors do not use any of the slip ring connections.
The housings are four inches long. They weigh about 16 ounces. The rotors are made from high strength stainless steel. The stators are lightweight, nickel-plated, aluminum. Threaded holes are provided for attaching a rotation restraint. Connection information is permanently engraved on the housing. Circular stator connectors and rotor solder terminals are offered as wiring terminations.
All housings in this series have been designed to accept contacting rotary seals. Units ordered with these seals (choice W) are completely weatherproof and can survive days of total submersion. The seals limit operation to 2000 rpm maximum. Most wet weather applications, like automotive wheels, are within this range. For higher speeds in dry conditions, order units without the contacting rotary seals. Units without seals are capable of 4,000 rpm.
Unit torque with seals is 21 inch-ounces. Unit torque without seals is three inch-ounces.
Rotation sensor choice R360: The resolver is an analog rotation sensor with two outputs labeled sine and cosine. The outputs can be passed through the same type of filters as strain gage or other analog sensor signals coming through the slip rings. Then the rotation signal will remain in phase with the sensor signals.
The resolver requires additional external electronics for excitation and for processing the outputs. A resolver is an absolute position sensor. Its’ angular position is known as soon as the excitation and electronics is turned on, an index pulse does not have to be located before the shaft position can be determined. Temperature range is -40F to +250F. Accuracy of the resolver is 0.25°.
System accuracy, which includes the electronics, is within 1°.