Auto Calibration of Thermal X-Factors

Overview

The aim of the “Characterization – Thermal – Motor & Generator – Fitting” test is based on a steady state thermal computation.

Whatever the considered machine, FluxMotor creates a thermal network based on the machine topology design. However, if needed, it is possible to adjust the thermal resistances with some calibration factors (X-Factors, for external cooling as well as internal cooling) to be consistent with the measurement results, for instance. This has an impact on the resulting temperatures one gets in steady state or transient mode.

The user can adjust the calibration factors step by step, and evaluate the final temperatures by performing a manual iterative process.

This can be used either when the users want to impose the reference temperatures that are coming from measurements or when the users want to keep the same temperatures after a modification of the internal thermal architecture model.

With the test Characterization – Thermal – Motor & Generator - Fitting, the calibration for the X-factors is fully automatic. The user must target the temperatures to be obtained and the X-Factors that can be used to reach this goal. As a result, one gets X-Factors values to be applied for reaching the targeted temperatures.

This can be used either when the users want to impose the reference temperatures that are coming from measurements or when the users want to keep the same temperatures whatever the modifications to the internal thermal model architecture.

Note: This test is based on a steady state thermal computation.

Note: In a first step, this test is dedicated to the Synchronous Machines with Permanent Magnets – Inner Rotor.

Targeted temperatures and X-Factors

The aim of this dialog box is to collect the targeted temperatures to be reached. They are defined at each main node of the internal thermal network. See the illustration below.


List of targeted temperature and list of the calibration factors (X-Factors) to be considered during the fitting process.
1	Auto/User mode switches allow you to select the thermal nodes and set the corresponding target temperatures.
2	List of the calibration factors (X-Factors) to be considered during the fitting process. By default, all the X-Factors are considered for the fitting process. The user must select the ones that must not be considered while operating the process. Set the value to No when the corresponding X-Factors must not be considered during the process.

Illustrations of the results are presented below.


Illustration of results
1	Calibration factors – Initial and final values are displayed.
2	Final temperatures resulting from the fitting process.
3	Resulting deviation between the initial temperature values and the final ones. This allows us to evaluate the impact of the fitting process.