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Q1/Why Does an AC Motor Need a Capacitor to Start?

You will find in this PPT all important and useful information for induction motors.

I want you to summarize some benefits from the PPT at lest one.

This technical manual for Three-Phase Induction Motors is the first publication of a series on the topic of "Motor Management".
With these published fundamentals the user will have a growing reference
work on the performance and operational data required for design and
application. The following topics will be covered:

• Starting and operating motors
• Protection of motors and drives
• Selection and operation of controls
• Communications

Electric motors can be found in almost every production process today.
Getting the most out of your application is becoming more and more 
important in order to ensure cost-effective operations. "Motor Management"
from Rockwell Automation will help you:

• to optimize the use of your systems
• to reduce maintenance costs
• to increase dependability

We are pleased that our publications may help you find economical and
efficient solutions for your applications.

Content:
Design
Duty Types
Selection
Dimensioning

Copyright © 1996 by Sprecher+Schuh AG Rockwell Automation, Aarau. 
All information supplied is accurate to the best of our knowledge and without legal liability.

A three phase motor will give three times the power output when the stator windings are connected in delta than if connected in star, but will take 1/3 of the current from the supply when connected in star than when connected in delta. The starting torque developed in star is ½ that when starting in delta.

1. A two-position switch (manual or automatic) is provided through a timing relay.
2. Starting in star reduces the starting current.
3. When the motor has accelerated up to speed and the current is reduced to its normal value, the starter is moved to run position with the windings now connected in delta.
4. More complicated than the DOL starter, a motor with a star-delta starter may not produce sufficient torque to start against full load, so output is reduced in the start position. The motors are thus normally started under a light load condition.
5. Switching causes a transient current which may have peak values in excess of those with DOL.

The 3-phase induction motors are of three types depending upon the type of rotor they employ namely

(i) Squirrel cage rotor

(ii) Wound rotor or slip-ring

(iii) Double squirrel cage rotor induction motors. The principle of operation is same for all types of induction motors.