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close this bookElectrical Machines - Basic vocational knowledge (Institut für Berufliche Entwicklung, 144 p.)
close this folder5. Asynchronous motors
View the document5.1. Constructional assembly
Open this folder and view contents5.2. Operating principles
Open this folder and view contents5.3. Operational behaviour
Open this folder and view contents5.4. Circuit engineering
View the document5.5. Application
View the document5.6. Characteristic values of squirrel cage motors

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?