THESIS WORKER TRANSITIONING TO SPEED-SENSORLESS CONTROL DURING RESOLVER FAULTS

Thesis Worker at Volvo Cars Welcome to explore the world of Volvo Cars by writing your thesis with us! As a thesis worker in our organization you are supported by a supervisor who follows you during your project.
All thesis projects are arranged in business critical areas and therefore you will be able to contribute to our company purpose – providing freedom to move in a safe, sustainable and personal way – from day one!    Transitioning to Speed-Sensorless Control During Resolver Faults   Background   The Electric Drive department at Volvo Cars is proud of being responsible for designing and delivering system solutions and functionality for the inverters, electric machine, and transmission, in our electrified vehicles.
Our vision is to become “Leading in electrification” and we are aiming to contribute to world class energy efficiency, E-machine functionality, sustainability, customer satisfaction and best performance and drivability, to all our future products.
Scope   Speed-sensorless control can be used as a standalone solution for IPM drives (PMSM) as an alternative to resolver or encoder supported drives.
Such system solutions benefit from the removal of an external sensor, which adds additional cost and could be prone to faults.
Traditional speed estimators use information from the back-emf.
However, such an observer becomes “blind” at zero speed.
Nowadays, sensorless IPM control is possible even at low-speeds and during speed reversal employing, for example, signal injection methods exploiting the saliency of the IPM.
With the appropriate combination of low-speed and high-speed position estimators, a robust and versatile drive can be conceived.
An interesting application of speed-sensorless control is that of a backup in case of a sensor error.
This thesis intends to investigate the performance of such a redundant system.
Apart from designing a functioning speed observer for a speed-sensorless control system, the student is challenged to elaborate a sensor-fusion between sensored and sensorless control and quantify its robustness.
For example, how can the fusion ensure robust operation in presence of a resolver error.
The results should be experimentally verified.
Activities we foresee that should be done during this thesis work are.
1.
Literature study.
2.
Work content as described above.
3.
Production of a final report and presentation.
Your contribution is our future   You are studying M.
c.
in electrical power engineering, control systems, or similar.
Understanding in electric machines, power electronics, machine control, observer design, and hands-on Python/MATLAB/C-programming are highly valuable.
Duration   • The duration of this thesis work is approx.
4-5 months (full time).
• Starting date is in January , exact date to be discussed.
• 30 ECTS   • This thesis work will be conducted for Volvo Cars Gothenburg in collaboration with the host university.
• This thesis work is to be conducted by 1 or 2 students.
• Office, computer and software will be organized by Volvo Cars    Be part of the change – apply today!  Selection will be ongoing during the application period, so do not hesitate to send in your application.
Attach your resume and cover letter and copies of grades.
You can provide a reference if you like.
Please note that due to GDPR, applications by email will not be accepted.
We want your application at the latest by 4th November .
If you have any additional questions regarding the position, you are welcome to contact us.
Supervisor.
Gustaf Falk Olson, (+) Hiring manager.
Anders Thulin, (+)    Volvo Cars - Driving change together​ Volvo Cars’ success is the outcome of a collaborative, diverse, and inclusive working environment.
Today, we are one of the most well-known and respected car brands, with around employees across the globe.
At Volvo Cars, your career is designed around your skills and aspirations, allowing you to reach your fullest potential.​ By , we aim to sell 1.
million cars annually, with 50 per cent being electric cars and sold directly to customers mainly through digital channels.
Make sure you’re in the front seat on this exciting journey as we pioneer the driving and electrification technologies of the future.