Catalog

1
IEC Squirrel-Cage Motors
Introduction
General technical data
Efficiency, power factor, rated torque,
rated speed and direction of rotation
Efficiency and power factor
The efficiency h and power factor cos j for each rated output are
listed in the selection tables in the individual sections of this
catalog.
For EFF1 and EFF2 motors, the 3/4 load efficiency is also indicated.
Part-load efficiency % at
1/4 1/2 3/4 4/4 5/4
of full load
93 96 97 97 96.5
92 95 96 96 95.5
90 93.5 95 95 94.5
89 92.5 94 94 93.5
88 91.5 93 93 92.5
87 91 92 92 91.5
86 90 91 91 90
85 89 90 90 89
84 88 89 89 88
80 87 88 88 87
79 86 87 87 86
78 85 86 86 85
76 84 85 85 83.5
74 83 84 84 82.5
72 82 83 83 81.5
70 81 82 82 80.5
68 80 81 81 79.5
66 79 80 80 78.5
64 77 79.5 79 77.5
62 75.5 78.5 78 76.5
60 74 77.5 77 75
58 73 76 76 74
56 72 75 75 73
55 71 74 74 72
54 70 73 73 71
53 68 72 72 70
52 67 71 71 69
51 66 70 70 68
50 65 69 69 67
49 64 67.5 68 66
48 62 66.5 67 65
47 61 65 66 64
46 60 64 65 63
45 59 63 64 62
44 57 62 63 61
43 56 60.5 62 60.5
42 55 59.5 61 59.5
41 54 58.5 60 58.5
The part-load values stated in the tables below are averages;
precise values can be provided on request.
Part-load power factor at
1/4 1/2 3/4 4/4 5/4
of full load
0.70 0.86 0.90 0.92 0.92
0.65 0.85 0.89 0.91 0.91
0.63 0.83 0.88 0.90 0.90
0.61 0.80 0.86 0.89 0.89
0.57 0.78 0.85 0.88 0.88
0.53 0.76 0.84 0.87 0.87
0.51 0.75 0.83 0.86 0.86
0.49 0.73 0.81 0.85 0.86
0.47 0.71 0.80 0.84 0.85
0.45 0.69 0.79 0.83 0.84
0.43 0.67 0.77 0.82 0.83
0.41 0.66 0.76 0.81 0.82
0.40 0.65 0.75 0.80 0.81
0.38 0.63 0.74 0.79 0.80
0.36 0.61 0.72 0.78 0.80
0.34 0.59 0.71 0.77 0.79
0.32 0.58 0.70 0.76 0.78
0.30 0.56 0.69 0.75 0.78
0.29 0.55 0.68 0.74 0.77
0.28 0.54 0.67 0.73 0.77
0.27 0.52 0.63 0.72 0.76
0.26 0.50 0.62 0.71 0.76
Rated torque
The rated torque in Nm delivered at the motor shaft is
9.55 P 1000
M=
n
P Rated output in kW
n Speed in rpm
Note:
If the voltage deviates from its rated value within the allowed
limits, the locked-rotor torque, the pull-up torque and the breakdown
torque vary with the approximate square of the value, but
the locked-rotor current varies approximately linearly.
In the case of squirrel-cage motors, the locked-rotor torque and
breakdown torque are listed in the selection tables as multiples
of the rated torque.
The normal practise is to start squirrel-cage motors directly on
line. The torque class indicates that with direct-on-line starting,
even if there is - 5% undervoltage, it is possible to start up the
motor against a load torque of
• 160% for CL 16
• 130% for CL 13
• 100% for CL 10
• 70% for CL 7
• 50% for CL 5
of the rated torque.
The individual torque characteristics are available in the SD
configurator. In addition, it is possible to perform calculations
with the supplied start-up program.
For type 1MA motors in the standard design for T1/T2 and
T3 and different rated outputs, the torque class specified for the
higher output applies.
1/28 Siemens D 81.1 · 2006