Drip-Proof Induction Motor Efficiencies

Electric Motors, Generators and Drives

This table defines the nominal efficiencies for open drip-proof induction motors that ar rate at 600 V or less.

An AC induction or asynchronous motor is an electric motor where the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding.

Nominal Efficiencies for Open Drip-Proof Induction Motors Rated 600 V or Less

Nominal Efficiencies for NEMA Induction Motors Rated 600 Volts or Less (Random Wound)

hp

Open Drip-Proof

1200 RPM (6-pole)

1800 RPM (4-pole)

3600 RPM (2-pole)

EPAct*

NEMA Premium

EPAct*

NEMA Premium

EPAct*

NEMA Premium

1

80.0

82.5

82.5

85.5

N/A

77.0

1.5

84.0

86.5

84.0

86.5

82.5

84.0

2

85.5

87.5

84.0

86.5

84.0

85.5

3

86.5

88.5

86.5

89.5

84.0

85.5

5

87.5

89.5

87.5

89.5

85.5

86.5

7.5

88.5

90.2

88.5

91.0

87.5

88.5

10

90.2

91.7

89.5

91.7

88.5

89.5

15

90.2

91.7

91.0

93.0

89.5

90.2

20

91.0

92.4

91.0

93.0

90.2

91.0

25

91.7

93.0

91.7

93.6

91.0

91.7

30

92.4

93.6

92.4

94.1

91.0

91.7

40

93.0

94.1

93.0

94.1

91.7

92.4

50

93.0

94.1

93.0

94.5

92.4

93.0

60

93.6

94.5

93.6

95.0

93.0

93.6

75

93.6

94.5

94.1

95.0

93.0

93.6

100

94.1

95.0

94.1

95.4

93.0

93.6

125

94.1

95.0

94.5

95.4

93.6

94.1

150

94.5

95.4

95.0

95.8

93.6

94.1

200

94.5

95.4

95.0

95.8

94.5

95.0

250

-

95.4

-

95.8

-

95.0

300

-

95.4

-

95.8

-

95.4

350

-

95.4

-

95.8

-

95.4

400

-

95.8

-

95.8

-

95.8

450

-

96.2

-

96.2

-

95.8

500

-

96.2

-

96.2

-

95.8

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