Motor - Efficiency Map Scalar Control (U-I)

Positioning and objective

The aim of the test “Performance mapping – Sine wave – Motor – Efficiency map scalar U-I” is to characterize the behavior of the machine in the "Torque-Speed" area.

Input parameters like, “the maximum Line-Line voltage, the maximum line current and the maximum speed” of the machine are considered.

The main difference with the test “Performance mapping – Sine wave – Motor – Efficiency map scalar U-f” is that the speed of the base speed point is not fix by a user input (Rated power supply frequency) but deduced by the internal process of computation to maximize mechanical power.

One type of command mode is available: scalar command.

Input parameters define the torque-speed area in which the evaluation of the machine behavior is performed.

 Characterization of the corner point on the torque-speed curve

In the results, the performance of the machine at the base point (base speed point) and the maximum speed (maximum speed point), set by the user are presented.

A set of curves (like a Torque-Speed curve) and maps (like an Efficiency map) are computed and displayed.

 Mechanical torque versus speed - Example
 Efficiency in torque-speed area - Example
Note:

Curves are calculated and displayed identical to those presented in the test “Performance mapping – Sine wave – Motor – Efficiency map scalar U-f”.

Please refer to the section dedicated to this test to see the corresponding illustrations.

The following table helps in classifying the test: “Performance mapping – Sine wave – Motor – Efficiency map scalar U-I”.

 Familly Performance mapping Package sine wave Convention Motor Test Efficiency map scalar U-I Positioning of the test “Performance mapping - Sine wave - Motor - Efficiency map scalar U-I

User inputs

The three main user input parameters are “the maximum Line-Line voltage, the maximum line current and the maximum speed”. In addition, the temperatures of the winding, and squirrel cage must be set, as well as the power electronics data if needed.
Warning: Default values of advanced inputs have been set to obtain the best compromise between accuracy and computation time.

Main outputs

Different kinds of output are displayed, like data, curves, maps, and tables.

Main test results

1. Machine performance - Base speed point
• General data like torque, speed, electrical powers, power factor, efficiency etc.
• Power balance
2. Machine performance - Maximum speed
• General data like torque, speed, electrical powers, power factor, efficiency etc.
• Power balance
3. Torque-speed curves
• Mechanical torque versus speed
• Efficiency torque versus speed
• Current versus speed
• Voltage versus speed
• Slip versus speed
• Frequency versus speed
• Power (Mechanical power, machine electrical power, system electrical power) versus speed
• Power factor versus speed
• Losses versus speed (total machine and system, Stator Joule, Rotor Joule, mechanical, power electronics) (iron losses are neglected for the first version of this test)
4. Characteristic curves
• “Normalized base point curves” versus speed
• “Normalized envelope curves” versus speed
• “Voltage boost” versus speed (low speed between zero speed and base speed)
5. Torque-Speed maps
• Efficiency in torque-speed area
• Current in torque-speed area
• Voltage in torque-speed area
• Slip in torque-speed area
• Frequency in torque-speed area
• Power (Mechanical power, machine electrical power, system electrical power) in torque-speed area
• Power factor in torque-speed area
• Losses in torque-speed area (total machine and system, total Joule, mechanical, power electronics) (iron losses are neglected for the first version of this test)
• Joule losses in torque-speed area (Total, Stator and Rotor)