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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:
- Optimization of the motor current control
- Optimization of starting and braking
- Controlled slip
- Roll-back prevention
- Wheel-slide prevention (braking)
- Speed control during shunting (large-mass moving at low speed)
- Using the encoder signals as controlled variable for energy recovery in breaking
- Deliberate suppressing of unwanted mechanical oscillations in the drive
- Vehicle speed evaluation
- Starting heavy trains on gradients
- Rolling distance measurement
Vehicle and platform doors
- Optimized movement and position monitoring
- Recognition of obstacles
Products
We can fulfill 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.
- One to three channels
- Measures frequencies in the range from 0 Hz to 25 kHz
- For toothed wheel targets with modules from 1 to 3.5
- Air-gap up to 3 mm
- Output signal pattern: square wave (voltage, standstill voltage or current)
- Protection class IP 68, fully potted
Single-channel speed sensors
Two-channel rotary speed sensor
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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
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Three-channel rotary speed sensor
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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
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Two-channel speed sensors for electrically conductive target wheels
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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
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Compact two-channel rotary speed sensor
High-resolution encoders
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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
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- Output signal: two sinusoidal signals offset by 90°; optional reference pulse
- Up to 256 pulses per revolution with provision for external interpolation (1024 pulses or more
can be achieved)
- Extremely robust encoder for measuring rotational movements in machines and vehicles
- Rugged construction housed in stainless steel
- Measures magnetically
- Highly resistant to electromagnetic discharges and interference
- Extremely wide temperature range from ‑40 °C to +120 °C
- Splashproof and highly resistant to condensation
- Very high protection class: IP 67
- Available as fixed-shaft encoders (diameter 16 mm ) or with our patented integrated quill shaft
coupling
- Numerous special construction models available on request
Multi-channel encoders
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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
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Principal features:
- From one to eight channels
- Up to three different pulse counts from one encoder
- Voltage and current signals
- Freely configurable phase relationships between the channels
- Various 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.
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