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13 / 39

  • IEC 60034-31:2009

  • 13 –

2/1554/CD

5.5

Part load efficiency

Three-phase cage motors offer fairly constant efficiencies over a wide range of partial loads as indicated by Fig. 3

100

Efficiency [%]

150kW

15kW

1,1kW

95

90

85

80

75

70

  • 0

    0,25

0,5

0,75

1

P/PN

1,25

Figure 3

Typical efficiency versus load curve bands for 2- and 4-pole three-phase, cage- induction motors

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