Variable frequency drives are widely used to control the speed of ac motors.  This note looks at the mechanisms which enable drive units to control the...

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...

I think this post is going to be helpful to several of our readers. While the IEC low voltage circuit breaker Standard [IEC 60947-2, Low voltage switchgear...

This post is quick introduction and overview to different railway electrification voltages used in answer to a question sent in via email. While there...

When selecting a generator, there are inherent limits on the active and reactive power which can be delivered. Generators are normally sized for a certain...

GE have put together a time-lapse video shown flight take-off and landings at some airports. An interesting view:

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...

When sizing cables, the heat generated  by losses within any sheath or armour need to be evaluated. When significant, it becomes a factor to be considered...

Collection of links to various places with useful motor information. I’ll try and return to the page every now and again to update it with any motor notes...

The calculation of current in a three phase system has been brought up on our site feedback and is a discussion I seem to get involved in every now and...