More accurate temperature measure and homogeneity
- 1) The accurate temperature measurement can only be obtained when considering the resistance measure evolution. A copper winding resistance following the below equation, one can already get an accurate temperature with a calculator.
- 2) All this would be no use if temperature gradients are not accurately controlled. The winding temperature could reach high values in some thermal insulated zones and low values in other zones cooled by a magnetic circuit even if the average resistance value is good. (Coils heads can reach 280°C and slots temperatures 160 °C). At 280 °C wires will be damaged and at 160 °C there will be no bonding.
One-coated edge to edge winding without coil-slug 20 °C/W 160 °C
Different temperatures examples for a constant copper quantity
One-coated loosen turns winding without coil-slug 8 °C/W 60 °C
Three-coated edge to edge winding without coil-slug 27 °C/W 250 °C
- 5 turns winding sandwiched between 2 radiators 5 °C/W 50 °C
One coated edge to edge winding with aluminium coil-slug 11 °C/W 90 °C
About AMR
Joule Effect Polymerization
Direct Induction
AMR machines
Bench tests for motors
Windings repairs
Comparisons
Infos miscellanious
R= Ro(1+∂∆T) with ∂(Cu)= 0,00396
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