The aim of this work concerns the development and the validation of a thermal steady state model
applied to a permanent magnet direct current motor with commutator. The rated power of the machine is 120 W.
Design has been realized thanks to the thermal modulus of the computation software with the finite element
method Flux3D. It is shown in this work how it is possible to use only the heat equation to simulate the thermal
behaviour of the motor. It implies calculating of new fluid conductivities (considering also all thermal modes)
by comparison of calculated and experimental temperatures. To realize these 3D modelizations, it is necessary to
know and to locate all the losses of the motor which are considered as thermal sources. The experimental
temperatures are given by 40 chromel-alumel thermocouples of
100 μm diameter located in the rotor and the
stator of the machine. Numerical computations use Dirichlet boundary
layer conditions given by an IR camera.