Computation and displaying of characterization model maps

Overview

The aim of the test “Characterization – Model – Motor – Scalar” is to characterize the behavior of the machine in function of a set of Line-Line voltage (U) and a set of power supply frequency (f) (only the motor operating mode is available).

Characterization – Model – Motor – Scalar - Illustration

The computations are based on the identification and the solving of a non-linear model which is built with maps. It considers cross saturation and eddy current effects in the squirrel cage.

The identification of the model (1st harmonic) is operated with the steady state AC application of Flux (Finite Elements).

All this allows getting a very good compromise between the accuracy of results and the computation time.

Characterization – Model – Motor – Scalar - Model

All the main electromagnetic quantities are computed and displayed as curves in function of speed for a given power supply frequency and a set of Line-Line voltages.

Note: In the current version, this test is proposed in a beta mode, which implies that all functionalities are not entirely qualified yet, but the users can use it for evaluation.

The results of this test gives an overview of the electromagnetic behavior of the machine considering its topology and physical properties of active components.

For a set of Line-Line voltages (U) and a set of power supply frequencies (f), the general data of the machine, like mechanical torque, currents, power factor and power balance are computed and displayed as curves.

This gives the capability to make comparisons between the results got from the measurements and with FluxMotor®.

With this test, system engineers will find a characterization tool adapted to their needs and able to provide accurate curves ready to be used in system simulation software, like Activate or PSIM. Indeed, from the results obtained in this test, a scalar drive and control can be applied.

User inputs and outputs

The main user input parameters are “the maximum Line-Line voltage, the rated power supply frequency, the maximum line current and the maximum speed”. In addition, temperatures of winding, and squirrel cage must be set, and the power electronics data if needed.

The main outputs are displayed as curves versus speed for a set of Line-Line voltage (U) and a set of power supply frequency (f) such as Mechanical torque, Mechanical power, Machine efficiency, System efficiency, Machine electrical power, System electrical power, Machine total losses, System total losses, Stator total losses, Rotor total losses, Mechanical total losses, Power electronics losses, Power factor, Stator current

Illustration of results for a set of Line-Line voltage (U) and a set of power supply frequency (f)

Some outputs, like torque, current, efficiency, and power factor are also displayed as the normalized base point curves.

Normalized base point curves

For more details, please refer to the following documents:

MotorFactory_2022.3_IMSQ_IOR_3PH_Test_Introduction and MotorFactory_2022.3_IMSQ_IOR_3PH_Test_Characterization.