Electric Motors 

By on

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.

Internal (myElectrical) Links

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.

External Links

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

What is an electric motor? –  find the answer on answers.com

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)

AC Industrial Electric Motors – RS datasheet (pdf download)

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



Steven McFadyen's avatar Steven McFadyen

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

myElectrical Engineering

comments powered by Disqus



UPS Battery Sizing

Various techniques exist to enable the correct selection of batteries for UPS applications.  The procedure described below is one of the more common. ...

Windows Live Writer and myElectrical

When making adding a Note to our site we have a great online WYSIWYG editor and things are pretty simple.  However, if you prefer you can write, manage...

Wiki Depreciation

We have had the Wiki with us for a long time now, but at last I have decided to say bye bye – more details on why below.

How to Calculate Motor Starting Time

Request to look at induction motor starting time have come up a few times on the site. Hopefully in this post, I give you guys some idea on how to calculate...

Robotics - Home Innovations

We have a sister note to this (Robots - Interesting Video), in which I have posted some videos of interesting robots developed by commercial corporations...

Voltage Levels – Confused?

I was having a conversation the other day about voltage levels.  While everyone was in agreement that low voltage was 1000 V and less, there was more confusion...

110 or 230 Volts

I've been considering a blog on the 110 or 230 Volt issue for a while.  While browsing the Internet I came across a great summary by Borat over at  engineering...

Differential protection, the good old days

This morning I was explaining how differential protection works to a junior engineer. To give him something to read I opened up the NPAG (Network Protection...

Cable Sizing Tool

Our cable sizing tool is one of the more popular tools on the site.  The tool enables cables to be sized in compliance with BS 7671 (the IEE Wiring Regulations...

Understanding Circuit Breaker Markings

IEC 60947 is the circuit breaker standard and covers the marking of breakers in detail. Any manufacturer following this standard should comply with the...

Have some knowledge to share

If you have some expert knowledge or experience, why not consider sharing this with our community.  

By writing an electrical note, you will be educating our users and at the same time promoting your expertise within the engineering community.

To get started and understand our policy, you can read our How to Write an Electrical Note