Thermal diagram

Introduction

The following picture gives an example of a simplified thermal circuit, including the main resistances corresponding to the machines, where a frame, a shaft and bearings have been added. The numbers on every resistance show what X-factor impacts this resistance value.

Note: To keep the scheme simple, the radiation resistances are not represented there.

Synchronous machines with permanent magnets

The following picture gives an example of a simple thermal circuit, including the main resistances corresponding to the default synchronous machine with permanent magnets.

Table 1. Thermal circuit – Relation with the calibration factors. Schematic example for the SMPM machine.

Reluctance synchronous machines

The following picture gives an example of a simple thermal circuit, including the main resistances corresponding to the default reluctance synchronous machine.

Table 2. Thermal circuit – Relation with the calibration factors. Schematic example for the SM-RSM machine.

Wound field synchronous machines – Inner salient poles

The following picture gives an example of a simple thermal circuit, including the main resistances corresponding to the default wound field synchronous machine with inner salient poles.

Table 3. Thermal circuit – Relation with the calibration factors. Schematic example for the SM-WFISP machine.

Induction machine with squirrel cage

The following picture gives an example of a simple thermal circuit, including the main resistances corresponding to the default induction machine with a squirrel cage.

Table 4. Thermal circuit – Relation with the calibration factors. Schematic example for the IMSQ machine