Efficiency map

Positioning and objective

The aim of the test “Performance mapping – Sine wave – Motor – Efficiency map” 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 desired “Maximum speed” of the machine are considered.

Two types of command modes are available: The Maximum Torque Per Volt command mode (MTPV) and the Maximum Torque Per Amps command mode (MTPA).

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

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

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

Note: In addition, in Jd-Jq plane, a graph shows the computed working points for the torque speed curve.

The iso-electromagnetic torque, the iso-current and the iso-voltage are also displayed in Jd-Jq plane.

These results help the user to understand the possible performance of the machine in its electric environment.

Figure 1. Efficiency in torque-speed area - Example

Driving cycle & thermal solving

Several features are available in this test.

The first one allows extracting one torque-speed point from the efficiency map to get the machine performance, for this specific working point (general data + power balance).

Note: The considered working point is then displayed on all the maps available.

The second feature allows the user to define a duty cycle by giving a list of working points (speed, torque) versus the time. The displayed results illustrate the machine performance over the considered duty cycle (mean, min, and max values).

The time variation of the main quantities is also displayed (Mechanical torque, speed, control angle, current, voltage, power, efficiency, losses).

Note: All the corresponding points are displayed on the different provided maps.

Another one allows to compute a driving cycle with thermal solving

When the "thermal solving" is selected in the settings, the machine temperatures are computed over the driving cycle.

The variation of the machine performance are computed and displayed over all the driving cycle time.

Figure 2. A “Driving cycle” displayed on the efficiency map – Example + The machine temperature variations can be evaluated all along the driving cycle

Table 1. Positioning of the test “Performance mapping – Sine wave – Motor – Efficiency map”
Family	Performance mapping
Package	Sine wave
Convention	Motor
Test	Efficiency map

Subsections

Inputs

For more details, please refer to Inputs.

Thermal

For more details, please refer to Thermal.

Duty

For more details, please refer to Duty.

Electronics

For more details, please refer to Electronics.

Mechanics

For more details, please refer to Mechanics.