Although the group’s main focus is energy storage, until 2017 we had a secondary focus on electrical machines, in particular temperature and degradation issues. Current density and torque density in motors is thermally limited and extreme temperatures severely reduce the lifetime of insulation systems and may lead to demagnetisation. We developed new approaches for reduced order thermal modelling of windings, new measurements and simulations of convection in machines, improved understanding of the impact of thermal extremes on insulation performance, and new diagnostic tools for temperature and lifetime.
Konstantinos Gyftakis (Edinburgh), Malcolm McCulloch (Oxford), Johan Gyselinck (ULB), Maria Bruna (Cambridge)
- P. Romanazzi, Bruna, M., Howey, D.A., “Thermal homogenisation of electrical machine windings applying the multiple-scales method”, ASME Journal of Heat Transfer, In Press, 2016. Email us if you cannot access this and want a copy.
- P. Romanazzi and Howey, D.A., “Air-Gap Convection in a Switched Reluctance Machine”, in Tenth International Conference on Ecological Vehicles and Renewable Energies (EVER), Monaco, 2015
- K. N. Gyftakis, Sumislawska, M., Kavanagh, D. F., Howey, D. A. and McCulloch, M. D., “Dielectric characteristics of electric vehicle traction motor winding insulation under thermal ageing”, IEEE Transactions on Industry Applications, In Press