 | Electrical Machines - Basic vocational knowledge (Institut für Berufliche Entwicklung, 144 p.) |
 |  | 5. Asynchronous motors |
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5.6. Characteristic values of squirrel cage motors
Survey 15 - Characteristic values of squirrel cage motors between 0.12 and 4 kW (380 V)
|
Speed |
Pn |
nn |
h |
cos jn |
In |
IA/In |
MA/Mn |
MK/Mn |
|
rpm |
kW |
rpm |
- |
- |
A |
- |
- |
- |
|
3000 |
0.18 |
2760 |
0.64 |
0.81 |
0.53 |
4.0 |
2.1 |
3.2 |
| |
0.25 |
2780 |
0.64 |
0.82 |
0.77 |
4.0 |
2.1 |
2.4 |
| |
0.37 |
2750 |
0.68 |
0.86 |
0.95 |
4.3 |
2.0 |
2.2 |
| |
0.55 |
2770 |
0.72 |
0.86 |
1.35 |
4.7 |
2.1 |
2.3 |
| |
0.75 |
2800 |
0.75 |
0.87 |
1.75 |
5.5 |
2.4 |
2.7 |
| |
1.10 |
2800 |
0.77 |
0.87 |
2.5 |
6.1 |
2.5 |
2.8 |
| |
1.50 |
2840 |
0.78 |
0.85 |
3.4 |
6.4 |
2.5 |
2.6 |
| |
2.20 |
2820 |
0.78 |
0.89 |
4.7 |
6.6 |
2.6 |
2.7 |
| |
3.00 |
2850 |
0.82 |
0.89 |
6.25 |
6.7 |
2.2 |
2.5 |
| |
4.00 |
2880 |
0.83 |
0.87 |
8.45 |
6.5 |
2.2 |
2.6 |
|
1500 |
0.12 |
1360 |
0.56 |
0.72 |
0.45 |
3.0 |
2.0 |
2.1 |
| |
0.18 |
1360 |
0.59 |
0.73 |
0.63 |
3.2 |
2.2 |
2.4 |
| |
0.25 |
1370 |
0.62 |
0.74 |
0.82 |
3.4 |
1.9 |
2.1 |
| |
0.37 |
1360 |
0.67 |
0.77 |
1.10 |
3.6 |
1.9 |
2.0 |
| |
0.55 |
1380 |
0.70 |
0.77 |
1.55 |
4.4 |
2.0 |
2.3 |
| |
0.75 |
1380 |
0.72 |
0.78 |
2.0 |
4.6 |
2.1 |
2.3 |
| |
1.10 |
1410 |
0.77 |
0.78 |
2.8 |
5.6 |
2.5 |
2.8 |
| |
1.50 |
1415 |
0.78 |
0.76 |
3.8 |
6.0 |
2.4 |
3.0 |
| |
2.20 |
1425 |
0.79 |
0.77 |
5.55 |
6.0 |
2.4 |
2.9 |
| |
3.00 |
1430 |
0.81 |
0.83 |
6.8 |
5.8 |
2.1 |
2.5 |
| |
4.00 |
1430 |
0.83 |
0.83 |
8.85 |
6.4 |
2.5 |
2.9 |
|
1000 |
0.12 |
870 |
0.50 |
0.61 |
0.6 |
2.5 |
2.1 |
2.2 |
| |
0.18 |
900 |
0.56 |
0.62 |
0.79 |
2.7 |
2.0 |
2.0 |
| |
0.25 |
900 |
0.59 |
0.58 |
1.1 |
2.9 |
2.3 |
2.4 |
| |
0.37 |
920 |
0.63 |
0.7 |
1.27 |
3.7 |
2.3 |
2.5 |
| |
0.55 |
920 |
0.67 |
0.69 |
1.8 |
4.0 |
2.6 |
2.8 |
| |
0.75 |
930 |
0.70 |
0.71 |
2.3 |
4.4 |
2.3 |
2.4 |
| |
1.10 |
930 |
0.73 |
0.73 |
3.1 |
4.5 |
2.2 |
2.4 |
| |
1.50 |
945 |
0.77 |
0.78 |
3.8 |
5.1 |
2.1 |
2.4 |
| |
2.20 |
945 |
0.78 |
0.81 |
5.3 |
4.9 |
2.0 |
2.4 |
|
750 |
0.12 |
670 |
0.44 |
0.56 |
0.74 |
2.2 |
2.1 |
2.2 |
| |
0.18 |
690 |
0.52 |
0.64 |
0.82 |
2.7 |
2.0 |
2.4 |
| |
0.25 |
690 |
0.56 |
0.63 |
1.1 |
3.0 |
2.3 |
2.5 |
| |
0.37 |
690 |
0.60 |
0.64 |
1.5 |
3.2 |
2.0 |
2.2 |
| |
0.55 |
690 |
0.64 |
0.65 |
2.0 |
3.3 |
2.0 |
2.1 |
| |
0.75 |
700 |
0.68 |
0.68 |
2.5 |
3.8 |
1.9 |
2.3 |
| |
1.10 |
700 |
0.70 |
0.70 |
3.4 |
4.0 |
2.1 |
2.5 |
| |
1.50 |
700 |
0.73 |
0.73 |
4.3 |
4.2 |
2.0 |
2.4 |
Questions for repetition and control
1. Explain the assembly of an asynchronous motor and its two different rotor types.
2. How is the torque of a three-phase asynchronous motor attained?
3. What are the effects of increasing shaft load on the speed and current acceptance of the asynchronous motor?
4. When is a three-phase slip ring motor used?
5. Describe the most common starting varieties of a three-phase motor setting out their advantages and disadvantages!
6. The following nominal data have been given for a three-phase motor: 5.5 kW; 1440 rpm; cos j = 0.82; h = 0.8; 380 V. Calculate motor current acceptance level!
7. How can the rotational direction of a three-phase motor be changed?
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