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Bosch Global

The development engineer Nina Mohr between green and white balloons with eAxle

New impulse for electromobility

The development engineer Nina Mohr is making vehicles more energy efficient

Reading time: 6 minutes

The aim is to capture pole position in the electromobility race. Bosch wants to take the market by storm with its electric axle drive (eAxle), which offers less weight, greater range, and more efficiency. Nina Mohr played a part in its development.

It’s the combination that counts

The special thing about the eAxle is that way engineers have brought three powertrain components together: motor, power electronics, and

transmission. But this isn’t just about combining three individual components in one system, it’s also about optimizing how they interact as a whole.

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eAxle: three become one

How does it work? A closer look at the eAxle

In a league of her own

In the eAxle, thermal design plays an important role. This is where Nina Mohr comes in. As a development engineer, she is responsible for finding a way of cooling the eAxle and its components. Working side by side with experienced engineers, the 27-year-old has a clear goal in her sights: “I want to work in an innovative field and make a contribution to sustainability.”

The development engineer Nina Mohr is talking to a colleague.
We’re cool. Nina Mohr is responsible for the eAxle’s cooling design

“Our team thrives on a culture of openness, a great sense of humor, and an atmosphere in which information is shared freely.”

Nina Mohr, development engineer at Bosch in Ludwigsburg, Germany
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Think big: the benefits of the eAxle

Symbolizing the Bosch eAxle’s efficiency level.
Higher efficiency: the eAxle utilizes more than 93 percent of its energy input. By way of comparison: up to now, the powertrains of electric vehicles have achieved efficiency levels of 80 percent or so
Symbolizing the Bosch eAxle’s great range.
Greater range: simulations have shown that the range of the same vehicle with a 100 kWh battery can be increased by up to nine kilometers in the WLTP test cycle if its axle is one percentage point more efficient
Symbolizing the Bosch eAxle’s wide variety.
Wider variety: with its highly flexible design, the eAxle can be installed in hybrid and electric vehicles, compact cars, SUVs, and light trucks — thus reducing the development time for automakers’ new models

Staying calm

Nina Mohr’s job demands not only a basic knowledge of energy technology, but also an understanding of all the individual components of the eAxle. “That was a challenge initially,” Mohr says. “It was important for me from the very outset to cooperate closely with the experts from the other specialist areas and to ask a lot of questions in order to acquire the knowledge I need.” She is responsible for the thermal design of the eAxle at the system level. As she explains: “There’s the system level and the component level. The components include the power electronics, transmission, and electric motor. My job is to look at the heat sources not only on a component level, but also to optimize the way they interact as a whole, so that the overall cooling approach functions

properly.” The aim is to use cooling to get the best possible performance out of the powertrain. In addition, the thermal design is decisive for optimizing efficiency, which in its turn is directly related to an electric vehicle’s range. With this in mind, Mohr develops simulation models that illustrate the thermal behavior of the system as a whole and discusses them with the people responsible for the power electronics and the electric motor. An optimum thermal design is a crucial factor in the development phase – not only for the electric vehicles’ battery, and thus their range, but also for the electric motor itself.

Nina Mohr

Nina Mohr

Development engineer

Electromobility is developing by leaps and bounds. That makes my work so varied and exciting.

Nina Mohr is 27 and lives in Stuttgart. Before studying for her master’s degree in energy technology at the University of Stuttgart, she completed a bachelor’s degree in industrial engineering and completed additional courses in engineering science. Focusing on energy efficiency and electrochemical energy storage, Mohr’s master’s thesis involved developing a thermal simulation model for cooling batteries. Since May 2016, she has been a development engineer at Bosch.

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