# Electric Motors

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Electrical motors are one of the most common items of electrical equipment in service today.  From toys and household appliances to the largest machines on the planet electric motors are used.  Motors as the single biggest users are estimated to account for between 43 and 46% of total global electricity use[1].

Given the widespread use of motors, it is not surprising that many of the posts on myElectrical deal with this topic.  This note is a collection of links to many of our motor notes and a few external resources.  I’ll try and return to the page every now and again to update it with any new notes which are added to the site.

Induction Motor Calculator Tool – does motor calculations and provided a formulae reference

Motor Starting Time Tool - calculate the approximate starting time for asynchronous motors

Understanding electric motor insulation & temperature - in easy to understand form

How to Calculate Motor Starting Time Post – post which explains how to do this

Understanding Motor Duty Rating Post – explains IEC duty ratings

8 Motor parts and common faults Post – list of common motor faults

Motor Starting – Introduction – introduction to motor starting

Other Notes Articles

The internal links were last updated June 2015.  If your reading this note later, it may be worth using the site search to look for additional information which may have been added.

The following links are external to myElectrical and provided for reference only.

Basic motor theory -  ac motor, dc motor and generator theory

Electric Motor – Wikipedia's article on electric motors in general

AC motor – Wikipedia’s article (types of motor, history and some theory)

Two Speed Motors – a primer on two speed motors (motorsandrives.com)

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Steven has over twenty five years experience working on some of the largest construction projects. He has a deep technical understanding of electrical engineering and is keen to share this knowledge. About the author

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