Work. Pt. - Sine wave - Motor - If I PSI N

Positioning and objective

The aim of the test “Working point – Sine wave – Motor – If, I, Ψ, N” is to characterize the behavior of the machine when operating at the targeted input values If, I, Ψ, N (Magnitude of field current, 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 field current, 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 – If, I, Ψ, N” test allows to compute the performance for this working point.

 “Working point – Sine wave – Motor – If, 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 the machine constant 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 obtained with Altair® FluxMotor®.

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

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

User inputs

The four main user input parameters are the field current, supply line current, control angle, speed, and computation mode. In addition, the temperatures of the windings must be set.

Main outputs

Test results are illustrated with data, graphs, and tables.

Main results

1. Machine performance – Base speed point
• General data
• Machine constants
• Power balance
• Flux in airgap
• Flux density in iron
2. Power electronics
• Inverter
• Working point
3. Ripple mechanical torque
• Working point

Curves – in the “Fast computation modes”

1. Ripple mechanical torque versus rotor angular position
2. Flux density in airgap versus rotor angular position

Curves – in the “Accurate computation modes”

1. Mechanical torque versus rotor angular position
2. Mechanical torque harmonic analysis
3. Flux density in airgap versus rotor angular position
4. Flux density in airgap harmonic analysis
5. Field voltage versus rotor angular position
6. Field current versus rotor angular position
7. Phase voltage versus rotor angular position
8. Phase voltage harmonic analysis
9. Phase current versus rotor angular position
10. Phase current harmonic analysis

1. Isovalues