• Which Products are you interested in ?

    CST offers a wide range of EM simulation software to address design challenges across the electromagnetic spectrum, from static and low frequency to microwave and RF, for a range of applications, including EDA & electronics, EMC & EMI and charged particle dynamics.

  • Antenna Magus
  • IdEM
  • FEST3D
  • Optenni Lab
  • Looking for a Training, Workshop or eSeminar ?

    CST STUDIO SUITE® is being demonstrated at trade shows and workshops all over the world. Take a look at the list of conferences and exhibitions CST will be attending and get further information regarding CST workshops, eSeminars and training days.

  • TrainingsRegular training courses are held in CST's offices in Asia, Europe, and North America. Please check our trainings section for detail of trainings in all over the globe. Advance registration is normally required.

  • WorkshopsCST hosts workshops in multiple languages and in countries around the world. Workshops provide an opportunity to learn about specific applications and refresh your skills with experienced CST support staff. Make sure you visit our workshop section.

  • eSeminarsThroughout the year, CST simulation experts present eSeminars on the applications, features and usage of our software. You can also view past eSeminars by searching our archive and filtering for the markets or industries that interest you most.

  • Check our latest Events
  • Why create a MyCST Account ?

    A MyCST account may facilitate your access to many of the offerings on the CST website, for example the registration for eSeminars and the watching of eSeminars recordings, setting email preferences, and there is more functionality to come. It is required to participate in workshops and trainings.

  • Personal PreferencesAllows you to update your email preferences and areas of interest. It helps us to personalize your experience.

  • EventsSearch for events by location, industry and application. Once you are registered, you will be able to manage your registrations and check important details about your events. This section also provides you with a repository for Workshop & Training material.

  • LibraryYou can collect articles you find on the CST website to reference or read later by clicking on the “Add this article” button at the bottom of the article page.

  • Create Your Own Account
  • Need technical Support ?

    Customers can customize their accounts once they have completed the account creation process. This platform acts as vivid interface between CST and our customers.

    We therefore offer access to the latest Service Packs (including an automatic notification that a new Service Pack is available), a steadily growing database of Frequently Asked Questions (FAQs), Application Notes and Training Videos, as well as an individual FTP section for easy exchange of large files with our support team.

  • Do I need an Account?To access the Support Site a valid maintenance contract and a one-time registration is required.

    Please note that your Support login does not work for the MyCST account.

  • Get Support
  • How to request a Trial License ?

    Get your license in only three steps:

    1. Fill in the required fields in the contact form on the right and click "Send Us Your Request".

    2. Lean back and wait until one of our CST Experts contacts you.

    3. Enjoy a our trial license.

  • Student Edition

    Student Edition The CST STUDIO SUITE® Student Edition has been developed with the aim of introducing you to the world of electromagnetic simulation, making Maxwell’s equations easier to understand than ever. With this edition you have, bar some restrictions, access to our powerful visualization engine and some of the most advanced solvers of CST STUDIO SUITE.

    Student Edition

CST – Computer Simulation Technology

Frauscher Sensor Technology Designs Rail Wheel Sensors with CST Studio Suite


Figure 1 A modern rail line, with a Frauscher wheel sensor (yellow box) in situ.

The safety and integrity of the modern rail network is possible thanks to an extensive system of sensors that are constantly reporting the location, speed, direction and state of trains. Frauscher Sensor Technology has developed and manufactured high-quality products in the field of inductive sensor technology since 1987, with a focus on railway signaling and train control systems that are responsible for the safety of rail operations.

Wheel sensors are key components of these systems. These identify and count the wheels that pass over them, allowing signalers to see which sections of tracks are occupied and making it possible for equipment such as level crossings to be activated automatically. Frauscher’s wheel sensors are based on induction, and work by measuring the changes in complex impedance of inductive coils as the metal train wheel passes over....


Most rail infrastructure is exposed to the elements, which means that it is exposed to extreme variations in temperature and humidity while rain, snow, ice and sand can accumulate around the equipment.

The trains themselves also introduce additional challenges, including misalignment due to cornering and spurious signals from eddy current brakes. Frauscher is a participant in the FP7 European ECUC (Eddy-Current Brake Compatibility) project. The objective of this project is to prove that linear eddy-current brakes (ECB) are an effective and applicable solution for increasing the braking capacity of new high speed trains and solving the concerns raised by railway infrastructure managers to overcome the drawbacks that ECB have experienced on some lines.

Because rail signaling equipment must operate to safety integrity level 4, the highest level, anything that might impair sensor performance needs to be carefully analyzed. For this reason, Frauscher introduced electromagnetic simulation with CST Studio Suite® into their development process.

By constructing a virtual prototype in CST Studio Suite (Figure 2), Frauscher were able to model the sensor response in a variety of conditions. The LF frequency domain solver was used, due to its ability to calculate eddy currents and AC coils. Automatic parameter sweeps made it possible to calculate how the sensor response varies as the wheel passes over the sensor and to calculate how the alignment of the wheel flange might affect performance on corners. Each individual simulation took just 10 minutes, allowing complex studies to be performed in a reasonable timescale.

Figure 2 A simulation model of the RSR123 wheel sensor, with a section of rail and a wheel. One coil is shown.

Figure 3 Magnetic field lines, showing coupling through the wheel.


The agreement between simulation and measurement (Figure 4 and Figure 5) gave Frauscher confidence in the ability of the LF frequency domain solver in CST Studio Suite to model its sensors. This paved the way for more complex analyses, such as characterization of the parasitic capacitance of the coils, and investigation of how the effect of age and moisture on materials might influence the performance of the sensors. Frauscher was also able to export simulation results into SPICE and MATLAB for further analysis.

Figure 4 Response curves for one system in an RSR123 wheel sensor with three different wheel alignments, comparing measurements (solid lines) with simulation (points).

Figure 5 Response curves for both systems in an RSR180 wheel sensor, comparing simulation (solid lines) with measurements (points).

With the help of simulation, Frauscher was able to better understand the physical working principles of the sensors and the interaction between sensor, rail and wheel. This helped it to ensure that its wheel sensors met the stringent safety standards of the rail industry, and to begin work on its next generation of sensor devices. Simulation reduced prototyping time and costs for future development, and allowed engineers to consider mounting configurations that otherwise would be prohibitively expensive or physically not possible.

CST STUDIO SUITE gave us the ability to quickly and accurately model our sensors including all complex interactions with the surrounding environment that just wouldn’t have been possible experimentally. The additional understanding will be invaluable in designing our future generations of sensors. In addition, I commend the friendly and competent CST staff who, albeit indirectly, equally contributed to the success of our models...


  • Dr. Gavin Lancaster
  • Developer R&D, Frauscher Sensor Technology

Rate this Article

0 of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Frauscher Sensortechnik GmbH has been developing and manufacturing high-quality products in the field of inductive sensor technology since 1987. The main area of application of these products are the railway signalling and train control systems that are responsible for the safety of rail operations. This results in the highest requirements regarding all stages of the product life cycle, from the design to subsequent provision of support for the products in the field.
contact support

Your session has expired. Redirecting you to the login page...

We use cookie to operate this website, improve its usability, personalize your experience, and track visits. By continuing to use this site, you are consenting to use of cookies. You have the possibility to manage the parameters and choose whether to accept certain cookies while on the site. For more information, please read our updated privacy policy

Cookie Management

When you browse our website, cookies are enabled by default and data may be read or stored locally on your device. You can set your preferences below:

Functional cookies

These cookies enable additional functionality like saving preferences, allowing social interactions and analyzing usage for site optimization.

Advertising cookies

These cookies enable us and third parties to serve ads that are relevant to your interests.