SPRUHJ1I January 2013 – October 2021 TMS320F2802-Q1 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1 , TMS320F28052-Q1 , TMS320F28052F , TMS320F28052F-Q1 , TMS320F28052M , TMS320F28052M-Q1 , TMS320F28054-Q1 , TMS320F28054F , TMS320F28054F-Q1 , TMS320F28054M , TMS320F28054M-Q1 , TMS320F2806-Q1 , TMS320F28062-Q1 , TMS320F28062F , TMS320F28062F-Q1 , TMS320F28068F , TMS320F28068M , TMS320F28069-Q1 , TMS320F28069F , TMS320F28069F-Q1 , TMS320F28069M , TMS320F28069M-Q1
A common material for the windings is copper. The following equation represents a linear approximation of the resistance and temperature relationship:
Where:
For example, consider a stator resistance, Rs, to be 10 Ω at 20°C, and the windings are made out of copper, with temperature coefficient of 0.00393°C-1. If the motor heats up to 150°C, the new stator resistance will be:
As can be seen, there is a significant resistance change depending on the temperature, in the example, almost 52% percent increase.