Why is the motor thermal state THR in percentage % ?


04 July 2023

The motor thermal state is expressed as I²t.
The thermal motor takes into account the copper and iron constants as well as the type of motor ventilation.
The motor thermal state is calculated with the square of the ratio of RMS measured current over the ITH  (motor thermal protection current) value.
So, the value THR does not correspond really to a temperature, but a percent of ITH current.