Example: thermal analysis
The self-heating of electric
motors under load can become a problem for many
applications. Most of the motor manufacturers do
not give any information on this issue. For a
safe estimation of the behaviour under thermal
stress (for example in cases of emergency) we
developed a method to determine the thermal
behaviour, which works without additional thermal
sensors. The method generates a physically based
model which can be integrated in the design
program or simulation.
The Technical Report "Thermal
Analysis of Electric Motors, Necessity - Model -
Conclusions"
describes our method to analyse the thermal
behaviour and derive operating limits. It is
available for PDF download (103 KB).
The following picture
shows in two diagrams:
 |
the
dissipated power (Pd) as the heat
source and |
|
the
measured temperature (T_M)
together with the model based
estimated temperature (T_E) in
the winding. |
|
The mean deviation between
measured and estimated (model based) temperature
of 1.5 Kelvin shows, that the thermal behaviour
is captured well. So the implications from the
model (temperature rise, time constants, steady
states, etc.) are very trustworthy.
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