Modular slip ring - end of shaft - 10 to 36 circuits - with encoder

End of shaft slip ring with rotation sensor

The highly modular SR/ERT Series provides up to 36 circuit connections with a rotation sensor that is mounted at the end of a rotating shaft in a robust housing. 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. The current capacity is 0.5 A 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. All models are available without encoder electronics as well.

The housings of the ERT slip ring assemblies are 80 to 130 mm long, depending on the number of slip rings. They weigh about 400 grams. 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.

SR/ERT Configuration

Circuits quantity

10, 20 or 36 circuits

Wheatherproof option

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 the following speeds:

• 10 rings – 10,000 rpm
• 20 rings – 4,000 rpm
• 36 rings – 2,400 rpm

Unit torque with seals is 151mNm. Unit torque without seals is 21 mNm. If the application requires a high speed, weatherproof slip ring & encoder, consider units with noncontacting labyrinth seals in the SR/E512 series.

Rotor and Stator Connections

Numerous options for the rotor/stator connections.

Circular connectors or solder terminals are offered as wiring terminations. A circular connector is usually specified on the stator. On the rotor, test applications needing a quick disconnect specify circular connectors. If space is limited, solder terminals are specified on the rotor. In both cases there is also a choice of orientation.

Encoder option (E)

• Resolution: 256, 360 or 512 pulses per rev.
• Signal output: 4 TTL-Signalausgänge A, B (um 90° versetzt zu A), A+B and I with Index-Puls/rev.
• Power supply unit: +5 to +20V DC / 100mA)
• No use of slip ring connections.
• Target and electronics resistant to shocks and vibrations

Encoder option with electronics (T / Tachometer)

• Encoder + embedded Encoder-Elektronics
• Signal output : 2 analog voltages +/-10V DC linear to shaft speed and position
• Customer specific electronics configuration done in factory
• Power supply: 6 to 16 V DC - 400 mA

Resolver R360 (R)

• absoluter Positionssensor mit absoluter Winkelposition, dadurch ist kein Indexpuls zu Nullpunktbestimmung erforderlich
• analoge Ausgangssignale Sinus und Cosinus
• externe Signalkonditionierung RESSC-2-12V erforderlich

SR/ERT available models

No encoder models

Encoder models

Model list below for 512 ppr encoder version. Available with 256 and 360ppr resolution as well.

Tachymeter models

Resolver models

• Refer to drawings

• Encoder / Tachymeter / Resolver
• Wheatherproof
• Connectors

• Cables