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General Speed-Torque
Characteristics
Three-Phase Induction Motors
NEMA
Design |
Locked
Rotor
Torque |
Break-
down
Torque |
Locked
Rotor
Current |
% Slip |
Relative
Efficiency |
| B |
70-275%* |
175-300%* |
600-700% |
.05-5% |
Medium or
High |
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Applications: Fans,
blowers, centrifugal pumps and compressors, motor-generator sets,
etc., where starting torque requirements are relatively low.
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| C |
200-250%* |
190-225%* |
600-700% |
1-5% |
Medium |
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Applications: Conveyors,
crushers, stirring machines, agitators, reciprocating pumps and
compressors, etc., where starting under load is required.
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| D |
275% |
275% |
600-700% |
5-8%
8-13%
15-25% |
Medium |
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Applications: High
peak loads with or without flywheels, such as punch presses, shears,
elevators, extractors, winches, hoists, oil-well pumping, and
wire-drawing machines.
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| E |
75-190%* |
160-200%* |
800-1000% |
0.5-3% |
High |
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Applications: Fans,
blowers, centrifugal pumps and compressors, motor-generator sets,
etc., where starting torque requirements are relatively low.
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Based on NEMA Standards MG 10,
Table 2-1. NEMA Design A is a variation of Design B having higher
locked-rotor current.
*Higher values are for motors having lower horsepower ratings.
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