30 hp - Vibration testing of electric machines

Background:

The complexity of electrical systems on commercial vehicles are continuously increasing, and as a consequence the amount of EEE (Electronic, Electric and Electro-mechanical) - components increases. At the same time the demands on life length and reliability are raised to higher and higher levels.

Traditional testing of EEE-components often is done on component level with well-established and standardized test methods. As example the vibration testing of these components is based on acceleration of the vibration levels with respect to the fatigue curve, and in most cases based on standardized accelerated vibration tests.

Scania is also in a technical change with the introduction of high voltage components (VCB) for the electrified vehicles. One example is the electric machine for vehicle propulsion, if the traditional test methods are used the complexity of the test setup will large due to the size and weight of the electric machine.
 

Some questions that raises with the new large components are:
- Is it reasonable to do an accelerated vibration test up to 2000 Hz on a 400 kg electric machine without possibility to apply torque and rpm?
-  Are the traditional standards/methods suitable for large electrical machines?

Target:
Create a road map for the work to merge traditional component testing according to established standards to fit the electrical propulsion machine. Suggest ways to optimize, improve or using new test methods, with the goal to reduce test time, test effort and contribute to better test results. This can be achieved with physical tests and/or simulations.

Assignment:
Assignments which can be included in the work are:

• Literature study of relevant articles in this matter and suggest a “roadmap” for further work.
• Investigate other branches in this matter, railroad and generator sets as example.
• How do we test today; do we comply to standards?; measurements and study of testing.
• Investigate possibilities to use upcoming simulation methods.
• Can other tests in the verification process be used to replace/reduce the vibration testing effort, as example life length tests with applied torque and electrical loads.

Candidate profile:

• Close to MSc Engineering degree in Mechanics, Thermodynamics, Material or Engineering Physics.
• Committed, self-starting, taking responsibility, high focus and interest to create new technique.
• Solution and result driven approach.

Number of students: 1 
Start date: Early 2024, but can be discussed
Estimated time needed: 20 weeks

Contact persons:
TBD, supervisor, 
Gonvel Kako, manager EEPCT, +46 8 553 70529, gonvel.kako@scania.com
 

A background check might be conducted for this position. We are conducting interviews continuously and may close the recruitment earlier than the date specified.     
 

Thesis Worker