Work. Pt.  Sine wave  Motor  U f N
1. Positioning and objective
The aim of the test “Working point – Sine wave – Motor – U, f, N” is to characterize the behavior of the machine when operating at the targeted input values U, f, N (Magnitude of lineline voltage, Power supply frequency, Speed).
These three inputs are enough to impose a precise working point.
For instance, a working point can be chosen on a torque slip curve, by identifying the voltage, the power supply frequency and the speed with different curves displayed in the “Performance mapping / Sine wave / Motor / TS” test. Then, the “Working point – Sine wave – Motor – U, f, N” test allows to compute the motor performance for this chosen working point.

“Working point – Sine wave – Motor – U, f, 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 mechanical torque, current, power factor, efficiency 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 predesign step (Hybrid model based on AC finite element computations and symmetrical component transformation)
 “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 measurements and those evaluated with other solution like finite element software.
When both the following conditions are met, this test allows to perform electromagnetic computations with coupled thermal analysis.
 The type of machine is Induction Machines with Squirrel cage with Inner rotor
 One of the two following thermal solving modes is selected: One iteration or iterative solving mode
It also gives the capability to make comparisons between the results got from measurements and those got with our software .
The following table helps to classify the test “Working point – Sine wave – Motor – U, f, N”.
Family  Working point 
Package  Sine wave 
Convention  Motor 
Test  U, f, N 
Positioning of the test “Working point – Sine wave – Motor – U, f, N” 
2. User inputs
The four main user input parameters are the supply LineLine voltage, power supply frequency, speed (or the slip) and the computation mode. In addition, temperatures of winding and squirrel cage must be set.
3. Main outputs
Test results are illustrated with data, graphs, and tables.
3.1 Main results

Machine performance – Working point
 General data
 Machine constants
 Power balance
 Flux in airgap
 Flux density in iron

Power electronics
 Inverter
 Working point

Thermal data
 Table of temperatures
3.2 Curves – in the “Fast computation modes”
 Ripple mechanical torque versus rotor angular position
 Flux density in airgap versus rotor angular position
3.3 Curves – in the “Accurate computation modes”
 Mechanical torque versus rotor angular position
 Mechanical torque harmonic analysis
 Flux density in airgap versus rotor angular position
 Flux density in airgap harmonic analysis
 Phase voltage versus rotor angular position
 Phase voltage harmonic analysis
 Phase current versus rotor angular position
 Phase current harmonic analysis
3.4 Graphics
 Isovalues
3.5 Temperatures
 Chart of temperature (radial and axial views)

Thermal data
 Table of temperatures