Motor Technology - Rail Sensors
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Lenord+Bauer... Railway technology

The plus: Going beyond expertise, development potential and production technology

For decades we have been acquiring, researching, discovering and developing specialized know-how on the topic of rail vehicles - and you can reap the benefits!

Service for high availability

Your demands on productivity, flexibility, ability to offer solutions and safety are our standards - from contributing to development to delivering on time. For you, for us and for the solution, dialogue is important. Fast, uncomplicated and efficiently we provide for brisk realization of successful projects - globally and locally.

Applications - not just for speed

Our comprehensive knowledge of the rail vehicle industry's requirements enables us to offer the right sensor solutions for a wide range of applications.

Vehicle drives, brakes and bogies:

bulletOptimization of the motor current control
bulletOptimization of starting and braking
bulletControlled slip
bulletRoll-back prevention
bulletWheel-slide prevention (braking)
bulletSpeed control during shunting (large-mass moving at low speed)
bulletUsing the encoder signals as controlled variable for energy recovery in breaking
bulletDeliberate suppressing of unwanted mechanical oscillations in the drive
bulletVehicle speed evaluation
bulletStarting heavy trains on gradients
bulletRolling distance measurement

Vehicle and platform doors

bulletOptimized movement and position monitoring
bulletRecognition of obstacles


We can fulfil your requirements fast and cost-effectively, either from our wide range of products or as a custom-made solution.

Robust and reliable encoders for harsh environments

Encoders used in rail vehicles are always exposed to very extreme conditions. They need to be unaffected by dirt, oil and grease, rainwater, condensation, and high and/or fluctuating temperatures. Rail vehicles are also subject to considerable shocks and vibrations, particularly in the unsprung parts of bogies. Our encoders can also take this kind of punishment without damage.

Our encoders operate magnetically. They employ the very latest sensor technology, circuitry and construction techniques and can therefore offer a high level of electrical and mechanical robustness, guaranteeing reliable function and long-term dependability.

Rotary speed sensors

Speed sensors for sensing toothed wheel targets are available in a wide range of types. Almost any installation requirement can be accommodated with different cable and connectors.

bulletOne to three channels
bulletMeasures frequencies in the range from 0 Hz to 25 kHz
bulletFor toothed wheel targets with modules from 1 to 3.5
bulletAir-gap up to 3 mm
bulletOutput signal pattern: square wave (voltage, standstill voltage or current)
bulletProtection class IP 68, fully potted

Single-channel speed sensors

Speed sensor GEL 2474 Contact-free measurement of rotational movements

Speed sensor GEL 2474


Two-channel rotary speed sensor

Speed Sensor GEL 247x Two square wave signals offset by 90 to measure rotational movement and detect the direction of rotation. Various models.

Electrically insulated outputs possible

Speed sensor GEL 247

Speed sensor GEL 2475


Three-channel rotary speed sensor

Speed Sensor GEL 2472 Two electrically insulated sensor systems offering direct connections to separate control electronics. System 1 has two channels to measure the engine speed and direction of rotation and System 2 incorporates a redundant rotary speed signal:

Speed sensor GEL 2472


Two-channel speed sensors for electrically conductive target wheels

Speed Sensor GEL 2471 This type uses the eddy-current principle and can therefore also scan the rotational speed and direction of aluminum or stainless steel target wheels, non-magnetic

Speed sensor GEL 2471


Compact two-channel rotary speed sensor

Speed Sensor GEL248 Universally applicable, space-saving, easy to fit, metal housing

Speed sensor GEL 248


High-resolution encoders

High resolution encoder GEL 295 In order to increase the traction performance of locomotives it is necessary to employ highly dynamic drive regulators, and for this you need high-resolution encoders. The technical solution is now available: it's the GEL 295, an encoder well-suited to railway use, with its own housing and bearings and a specially constructed wide-range coupling that can compensate for considerable amounts of play on the axial shaft. This encoder returns a very high pulse reading with high signal-edge precision.

High-resolution encoder GEL 295


bulletOutput signal: two sinusoidal signals offset by 90; optional reference pulse
bulletUp to 256 pulses per revolution with provision for external interpolation (1024 pulses or more can be achieved)
bulletExtremely robust encoder for measuring rotational movements in machines and vehicles
bulletRugged construction housed in stainless steel
bulletMeasures magnetically
bulletHighly resistant to electromagnetic discharges and interference
bulletExtremely wide temperature range from ‑40 C to +120 C
bulletSplash proof and highly resistant to condensation
bulletVery high protection class: IP 67
bulletAvailable as fixed-shaft encoders (diameter 16 mm ) or with our patented integrated quill shaft coupling
bulletNumerous special construction models available on request

Multi-channel encoders

Multichannel Encoder GEL 27xx Multi-channel encoders have been specially developed for the requirements of the rolling stock industry. These encoders are constructed to provide independent output signals for different control electronics, such as engine rev counters, wheel-slide protection, automatic train control and rolling distance.

Multi-channel encoder GEL 2700


Principal features:

bulletFrom one to eight channels
bulletUp to three different pulse counts from one encoder
bulletVoltage and current signals
bulletFreely configurable phase relationships between the channels
bulletVarious flange forms available

This encoder can be supplied in a number of variants for mounting on the axle cover or directly on the wheel with a torque converter bearing. Its flexible modular construction makes this an ideal encoder not only for new projects, but also for upgrading and retrofitting existing rolling stock.