Magnetic sensor scans structurally separated measuring scale

The magnetic speed sensors with flange housing or as threaded version detect rotational and linear motion of a measuring scale that is structurally separated from the sensor. Target wheels or measuring rods made of ferromagnetic or electroconductive materials serve as respective measuring scales.

Measuring system free of maintenance and wear

A major advantage of magnetic sensors is the contactless, and thus wear-free sensing principle, which is particularly suited for continuous operation in durable capital goods. Thanks to an encapsulation process and specially developed production methods, Lenord+Bauer speed sensors are also protected against extreme weather conditions, humidity, shock, and vibration. Thus they are in compliance with DIN EN 50155 and meet the requirements of protection class up to IP 68. Typical fields of application are mainly drive controls, and brake and train control systems in rail vehicles.

Special designs available as customized product version

The speed sensors produced by Lenord+Bauer are to a large extent customized product versions. By adapting the housing, or different cable and plug fabrication, we can implement almost any installation position. Depending on requirement, the sensors generate single or multi-channel square-wave signals - alternatively as voltage or current signal - ranging from 0 to 25 kHz. A standstill signal can also be implemented. On customer request we also produce, for instance, ATEX-protected product variants, special output signals for functional testing, and sensors with integrated pulse division or pulse multiplication.

Multisystem sensors: One sensor provides signals for up to four control systems

High-quality diagnostic units ensure greater railroad safety. The individual applications require very different signal properties. Our multi-system sensors are the space-saving solution for users with a growing number of control devices. Up to four independent speed sensors are integrated in an industry-standard housing. Just talk to us!

Today, precise measured values are required for real-time control. Rotary encoders with their own bearings and a wide variety of housing designs are used in this instance. A typical feature of these measuring systems is that the scanning unit and the target wheel are integrated in a single housing. Both components are precisely matched to each other. With pulse rates of up to 10,000 increments per revolution, the encoders cover all measurement requirements in the vehicle and have proven themselves in railroad rolling stock for decades.

Proven incremental rotary encoders

Our proven magnetic incremental encoders acquire the change in angle on a rotating shaft. The integrated sensors scan the built-in target wheel in contactless mode. The magnetic sensor system supplies 1-V_pp differential signals, HTL or TTL signals. The direction of rotation, the distance traveled and the speed of the rotating shaft can be determined from the signals generated, as an axle or motor encoder.

One axle encoder – many output signals

We offer special multi-channel axle encoders for wheel slide protection, train protection and secondary applications on the bogie. They provide different signals for several controllers and thus utilize their full potential. The sensors emit independent square-wave signals on up to eight channels. The push-pull electronics generate up to three different pulse numbers. Output is either in voltage or current levels. The channels can be configured and output either individually or in groups with fixed phase relationship. This allows the characteristics of the output signals to be matched accurately to the control units. This solution is individually tailored to the application.

Measuring systems for high loads

Extreme shaft loads frequently occur in rail transport. We offer precision encoders with a special coupling for this special load. The integrated and flexible hollow shaft coupling with a diameter of 20 mm enables attachment to motors with high axial and radial shaft movements. Alternatively, a rotary encoder series with a 16 mm solid shaft is available. Up to 5 independent and fully encapsulated sensor modules can be placed in a stainless steel housing. We adapt each module individually to your application and the control system. The system thus offers a wide range of applications.

Withstanding extreme weather conditions

All rotary encoders provide accurate measured values even under changing temperatures, humidity, strong vibrations and condensation. Additional protective measures can be selected for special environmental influences, such as protective coatings or condensed water outlets. Talk to us.

If the installation space on the undercarriage is limited, our CombiCODER combines several sensor types in a single housing. For example, they simultaneously measure rotational speed, temperature and vibrations. Alternatively, we combine different sensors individually according to your specifications and adapt the design if necessary. Your advantage: Instead of mounting three to four sensors, you only have to mount and test one sensor. This reduces the effort required for assembly and preventive maintenance significantly.

Upon request, we manufacture special flanges or connect, for example, the temperature sensor to a speed sensor using a cable harness. This greatly simplifies cabling.

Temperature acquisition

The temperature of motors and bearings can indicate inefficient or even critical conditions. Our compact platinum resistance thermometers record any changes and warn of any unwanted heat build-up on the undercarriage. The compact temperature sensors according to DIN EN 60751 are available with stainless steel tubes and brass flanges. For optimal measurement, we adapt the length of the measuring tube to your application.

Vibration and shock acquisition

Mechanical influences such as flat spots in the wheel rim or imperfections in the rail place the undercarriage under stress. To detect these stresses at an early stage, we use MEMS devices, among other devices. Their measured values provide information about shocks and vibrations suffered.

To ensure that modern train control systems receive reliable rotational speed signals, vehicle operators have to regularly replace passive sensors with active ones. Our screw-in threaded sensors are used to upgrade rail vehicles to the state of the art to enable continued operation.

Space-saving assembly variant

In addition to tried-and-tested speed sensors with flange housing, threaded sensors with one or alternatively two channels are another assembly variant for threaded or through holes. These spacesaving sensors can be easily integrated into existing designs without any mechanical adjustments thanks to standard thread types and nominal lengths as well as individual cable fabrication.

They acquire the rotational speed and direction of rotation directly at the motor or gearbox and detect even the smallest movements of the drive with a measuring range of 0 Hz to 20 kHz. Robust, high-resolution sensors were developed for use in the harshest ambient conditions. They are suitable, for example, for traction control and train protection. The maintenance- and wear-free magnetic measuring system in the thick-walled stainless steel housing withstands both shocks and vibrations. Certification in accordance with DNV GL, SIL, ATEX or IECEx is possible as an option.

High-quality diagnostic units ensure greater railroad safety. The individual applications require very different signal properties. Our multi-system sensors are the space-saving solution for users with a growing number of control devices. Up to four independent speed sensors are integrated in an industry-standard housing.

Four separate sensor units are technically feasible. If necessary, every control system has its own power supply and is electrically isolated. If need be, two channels can be generated with a fixed phase relationship. The requirements of all applications can be combined in a single housing from the traction control to the brake control.