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Because the short-circuited rotor windings have small resistance, even a small slip causes a large existing in the rotor and produces considerable torque. At full rated load, slip varies from more than 5% for little or unique purpose motors to less than 1% for big motors. These speed variations can cause load-sharing problems when in a different way sized motors are mechanically linked.

Standard torque [edit] Speed-torque curves for 4 induction motor types: A) Single-phase, B) Polyphase cage, C) Polyphase cage deep bar, D) Polyphase double cage Normal speed-torque curve for NEMA Style B Motor Short-term service for an AC induction motor from a complete stop to its operating point under a varying load.

Ideal for the majority of low performance loads such as centrifugal pumps and fans, Design B motors are constrained by the following typical torque ranges: Breakdown torque (peak torque), 175300% of rated torque Locked-rotor torque (torque at 100% slip), 75275% of rated torque Pull-up torque, 65190% of ranked torque. Over a motor's normal load range, the torque's slope is roughly linear or proportional to slip since the worth of rotor resistance divided by slip, R r/ s \ displaystyle R _ r '/ s, controls torque in a linear way.

As the load torque increases beyond breakdown torque the motor stalls. Starting [edit] There are three fundamental types of little induction motors: split-phase single-phase, shaded-pole single-phase, and polyphase. In two-pole single-phase motors, the torque goes to zero at 100% slip (zero speed), so these need modifications to the stator such as shaded-poles to provide beginning torque.

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The typical running windings within such a single-phase motor can trigger the rotor to kip down either instructions, so the beginning circuit determines the operating instructions. Magnetic flux in shaded pole motor. In Click Here For Additional Info -phase motors, starting is done by means of a copper wire reverse part of a pole; such a pole is described as a shaded pole.

This imparts enough rotational field energy to begin the motor. These motors are usually utilized in applications such as desk fans and record players, as the needed starting torque is low, and the low efficiency is bearable relative to the minimized expense of the motor and beginning technique compared to other AC motor styles.