Professor Paavo Rasilo models electromagnetism – research accelerates practical design processes

What are your main research interests?

My research field is electromechanics, which traditionally encompasses rotating electrical machines, such as generators and electric motors. 

My research group undertakes wide‑ranging research into the modelling of electromagnetic fields and magnetic materials, and we apply these models to the analysis and design of electromagnetic and electromechanical energy converters. The applications of our research have ranged from microwatt-scale energy harvesting devices to megawatt-scale transformers and electrical machines.

What makes your research significant?

With the exception of solar power, almost all electrical energy is generated by rotating machines, and approximately half of all electricity produced globally is converted into mechanical energy by electric motors. When electricity is transmitted, voltage levels are adjusted using transformers.

Discussion of energy conversion often focuses on efficiency, which is already quite high for both transformers and electrical machines, meaning that only a small proportion of the energy is lost as heat and most is retained for practical use. However, it is also important to remember that temperature rise determines how much power these devices can handle relative to their weight or volume. 

The accurate modelling of energy losses is the key to maximising power density and minimising material and cooling costs. In addition, better modelling tools enhance the reliability of electrical equipment and speed up design and product development processes.

Photo: Jonne Renvall / Tampere University

Where do you draw inspiration for your work as a professor?

My inspiration comes from the opportunity to discover scientifically novel solutions for modelling and designing energy converters that support practical engineering work. For example, it is highly rewarding to see practical measurements validate modelling methods with improved accuracy or computational performance.

What would you want to study next and why?

The modelling methods that are conventionally used for electrical machines have been developed for low-frequency operations, and they do not perform reliably when the switching frequency of power electronic equipment increases. We are working to extend the scope of these methods to ensure they keep up with technological developments. The frequency range between 10 kilohertz and 10 megahertz is a particularly intriguing area for research, as it brings together the challenges of conventional electrical power engineering and conventional radio engineering. 

What do you do in your free time?

I spend time with my children and enjoy outdoor activities, such as skiing, running, orienteering and hiking.

Welcome to the inaugural lectures of the new professors on 11 May 2026