- Simulate for 5 seconds: The machine is started at nominal
speed, flux is build up in the machine.
- Continue the simulation for additional 5 seconds: Subsequently
a load ramp is applied.
- Compare by plotting versus Pmech:
| Current |
I_sim |
I_meas |
| Speed |
w_sim |
w_meas |
| Power factor |
pf_sim |
pf_meas |
| Efficiency |
eff_sim |
eff_meas |
Machine parameters are taken from a standard 18.5 kW 400 V 50 Hz
motor, simulation results are compared with measurements.
| Nominal stator current |
32.85 |
A |
| Power factor |
0.898 |
|
| Speed |
1462.5 |
rpm |
| Electrical input |
20,443.95 |
W |
| Stator copper losses |
770.13 |
W |
| Stator core losses |
410.00 |
W |
| Rotor copper losses |
481.60 |
W |
| Stray load losses |
102.22 |
W |
| Friction losses |
180.00 |
W |
| Mechanical output |
18,500.00 |
W |
| Efficiency |
90.49 |
% |
| Nominal torque |
120.79 |
Nm |
| Stator resistance per phase |
0.56 |
Ω |
| Temperature coefficient |
copper |
|
| Reference temperature |
20 |
°C |
| Operation temperature |
90 |
°C |
| Stator leakage reactance at 50 Hz |
1.52 |
Ω |
| Main field reactance at 50 Hz |
66.40 |
Ω |
| Rotor leakage reactance at 50 Hz |
2.31 |
Ω |
| Rotor resistance per phase |
0.42 |
Ω |
| Temperature coefficient |
aluminium |
|
| Reference temperature |
20 |
°C |
| Operation temperature |
90 |
°C |
See:
Anton Haumer, Christian Kral, Hansjörg Kapeller, Thomas Bäuml,
Johannes V. Gragger
The AdvancedMachines Library: Loss Models for Electric
Machines
Modelica 2009, 7th International Modelica Conference
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