Skip to main content
Our research experts

Dr.-Ing. Marina Keller

Research engineer for electric motor design and simulation

"Like what you do, and then you will do your best." (Katherine G. Johnson)
Dr.-Ing. Marina Keller

I've been with Bosch in the Electric Drives and Electric Machines group since 2017. I am involved in the simulation and design of electrical powertrains. This includes traction motors for electric cars, but also steering drives, e-bike motors and electrified braking systems.

The current focus of my work is on the modeling and evaluation of electrical insulation systems in traction machines in the environment of increasing battery voltages and their supply with fast-switching power electronics.

Curriculum vitae

  1. Research engineer at Bosch Research in the electrical drives and electrical machines group
  2. Research assistant and PhD at the Institute of Electric Energy Conversion (iew) at Stuttgart University
  3. Dipl.-Ing. Electrical Engineering and Information Technology at Stuttgart University with focus on power electronics and control technology

Selected publications

Publications

Marina Keller (2019)

Design for a permanent magnetically excited powder composite transverse flux machine for robotics applications
  • Dissertation / ISBN: 978-3-8440-6990-7 / 1. Marina Keller (2019)
Publications

M. Keller, S. Müller, N. Parspour (2016)

Design of a permanent magnetic excited transverse flux machine for robotic applications
Publications

M. Keller, S. Müller, N. Parspour (2016)

Design of a transverse flux machine as joint drive for an articulated six-axis robot arm
Publications

M. Keller, N. Parspour (2017)

Experimental identification and validation of model parameters of a permanent magnetic excited transverse flux machine for robotic applications

Interview with Dr.-Ing. Marina Keller

Dr.-Ing. Marina Keller

Modeling, simulation and design of electric drives for Bosch's future electric mobility solutions

Please tell us what fascinates you most about research.

Research means that at the beginning you don't know where you will end up. There is no ready-made solution that leads safely to the goal. Of course it is not always pleasant that you have to take a detour or sometimes end up in a dead end, but once you have found a solution, it is a great feeling. This kind of work can not actually get monotonous, because you are constantly working on new topics, trying out new approaches, exploiting new technologies, learning something new every day.

What makes research done at Bosch so special?

The focus of research at Bosch is clearly on the development of better but also more cost-efficient products. The difference to academic research here is that Bosch covers the entire spectrum from research to production.For example, an electrical axis has strong interactions with electronics, magnetics, thermals, mechanics, control technology, acoustics and production technology. At Bosch, there are proven experts for all these domains, who work together in an interdisciplinary manner in order to get the best out of it.

What research topics are you currently working on at Bosch?

I am currently working on the effects of steep voltage edges on the insulation system of electrical traction machines. One important target is the electric drive train's efficiency. The current trend is therefore towards higher battery voltages and the use of new types of power semiconductors based on SiC and GaN technology. These can switch much faster and therefore put a strain on the e-machine's electrical insulation system. I am working on models to predict the load and service life of electrical insulation systems. This is also intended to avoid excessive oversizing, so Bosch can offer cost-effective solutions.

What are the biggest scientific challenges in your field of research?

As with all lifetime models, it is impossible to measure aging under real conditions. These data will only be available to us in a few years or decades. Projecting into the future based on today's data is therefore a major challenge. Aging hundreds of motors is just as impossible, because it's far too expensive. The data can only be obtained from abstracted partial models. Furthermore, aging is subject to a large number of influencing factors. There are operating parameters, environmental influences and production-related parameters. It is virtually impossible to find a closed model for all of these factors. The challenge lies in modeling the vague by using sensible simplifications and concentrating on the essentials.

How do the results of your research become part of solutions "Invented for life"?

Since recently, I have been driving an electric car myself and sometimes imagine while accelerating at the traffic light, how the inverter in the vehicle switches the 400V battery voltage on and off more than 10,000 times per second, while several 100A of current flow from the battery through the power electronics into the windings of the electric machine. And all of this works in ice and snow and in 38°C sunshine, while I continue to rumble over potholes without knowing it. This is not a matter of course, but an outstanding engineering achievement! I hope that my research will help ensure that this technology will continue to meet the high reliability standards demanded already by Robert Bosch and will continue to advance electric mobility.

Get in touch with me

Dr.-Ing. Marina Keller
Modeling, simulation and design of electric drives for Bosch's future electric mobility solutions