I - Ψ - N

Positioning and objective

The aim of the test “Working point – Sine wave – Motor – I, Ψ, N” is to characterize the behavior of the machine when operating at the targeted input values I, Ψ, N (Magnitude of current, Control angle, Speed).

These three inputs are enough to impose a precise working point.

For instance, a working point can be chosen on the efficiency map, by identifying the current, the control angle and the speed with different curves or maps displayed in the “Performance mapping / Sine wave / Motor / Efficiency map” test. Then, the “Working point – Sine wave – Motor – I, Ψ, N” test allows to compute the performance for this working point.

Figure 1. “Working point – Sine wave – Motor – I, Ψ, N” illustration


The results of this test give an overview of the electromagnetic analysis of the machine considering its topology.

The general data of the machine, like machine constants and power balance are computed and displayed. The motor convention is used to build the model.

The magnetic flux density is also computed in every region of the machine’s magnetic circuit to evaluate the design.

Two computation modes are available:
  • “Fast computation mode” is perfectly suited for the pre-design step (Hybrid model based on Magneto-Static Finite Element computations and Park transformation theory)
  • “Accurate computation mode” is perfectly suited for the final design step (Pure Finite Element modeling based on transient computations)

It also gives the capability to make comparisons between the results obtained from the measurements and those evaluated with Altair® FluxMotor®.

When the inner rotor machine is considered, this test allows to perform electromagnetic computations with coupled thermal analysis:
  • Either you can define the winding temperatures or define the physical properties of the materials needed to run the tests without any thermal computation
  • Else you can choose iterative process until convergence to perform electromagnetic computation coupled to thermal analysis.

The workflows of all these processes are described here-after.

The following table helps to classify the test “Working point – Sine wave – Motor – I, Ψ, N”.

Table 1. Positioning of the test “Working point – Sine wave – Motor – I, Ψ, N”
Family Working point
Package Sine wave
Convention Motor
Test I, Ψ, N

Subsections

Inputs

For more details, please refer to Inputs.

Thermal

For more details, please refer to Thermal.

Electronics

For more details, please refer to Electronics.

Mechanics

For more details, please refer to Mechanics.