# UNDERSTANDING TORQUE

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6 WHY IS HIGH INERTIA A PROBLEM? Prior to the time that a standard induction motor reaches operating speed, it will draw line current several times the rated nameplate value. The high current does not cause any problem if it is of short duration; but, when the high currents persist for an extended period of time, the temperature within the motor can reach levels that can be damaging. Speed, RPM HP Load WK 2 (Exclusive of Motor WK 2 ), Lb-Ft / / MG Load WK 2 for Integral horsepower Polyphase Squirrel-cage Induction Motors The table shown above lists the load WK 2 which integral-horsepower polyphase squirrel-cage induction motors, having performance characteristics in accordance with Part 12*, can accelerate without injurious heating under the following conditions: 1. Applied voltage and frequency in accordance with Two starts in succession (coasting to rest between starts) with the motor initially at the ambient temperature or one start with the motor initially at a temperature not exceeding its rated load operating temperature. * Locked-rotor torque in accordance with , breakdown torque in accordance with , Class A or B insulation system with temperature rise in accordance with 12.43, and service factor in accordance with During the accelerating period, a connected load torque equal to or less than a torque which varies as the square of the speed and is equal to 100 percent of rated-load torque at rated speed. Table 3 38

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