Advantages and disadvantages of induction motor - Semiconductor for You

Not known Factual Statements About All About Induction Motors - What They Are and How They Work

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

Induction Motors

Types of Single Phase Induction Motors (Split Phase, Capacitor Start,  Capacitor Run) - Electrical4U

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 Design B Motor Transient service for an A/C induction motor from a complete stop to its operating point under a differing load.

Suitable for a lot of low performance loads such as centrifugal pumps and fans, Design B motors are constrained by the following normal torque ranges: Breakdown torque (peak torque), 175300% of ranked 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 direct or proportional to slip due to the fact that the value of rotor resistance divided by slip, R r/ s \ displaystyle R _ r '/ s, controls torque in a direct way.

Not known Incorrect Statements About AC Induction Motors - Business Energy Advisor

As the load torque increases beyond breakdown torque the motor stalls. Beginning [edit] There are 3 fundamental kinds of small induction motors: split-phase single-phase, shaded-pole single-phase, and polyphase. In  Read More Here -pole single-phase motors, the torque goes to zero at 100% slip (no speed), so these need changes to the stator such as shaded-poles to provide beginning torque.

The normal running windings within such a single-phase motor can cause the rotor to turn in either direction, so the beginning circuit determines the operating direction. Magnetic flux in shaded pole motor. In particular smaller sized single-phase motors, starting is done by methods of a copper wire reverse part of a pole; such a pole is referred to as a shaded pole.

This imparts adequate rotational field energy to begin the motor. These motors are normally utilized in applications such as desk fans and record players, as the required beginning torque is low, and the low efficiency is tolerable relative to the decreased expense of the motor and beginning approach compared to other Air Conditioner motor styles.