about electronic motor control

[killabyte]

hi everyone, im electronic engineer, but i have not found any motor related question refered to electronics, is it unusual to have a electronic control for a squirrel cage motor ie?

in the industry do any of you deal with that?

are those controllers expensive? easy to find?

thanks

killa

 

[rbulsara]

Unless you consider vairable frequecny drives and solid state starters as non-electronic, they are very much prevailant.

VFD are almost a standard (at least in the USA) where speed control of a squirrel cage motor is required.

The costs have come down greatly, and in most cases it is not even a factor. They are very comparable to say a star-delta starter of a similar rating.

Solid state reduced voltage starter also comparable (10 to 15% more) than a standard starter.

All of these are easy to find and carried by all leading electrical equipment manufacturers.

 

[jbartos]

Suggestion: There are various resources available that might be used for enhancing backgroud in electronics aligned with squirrel-cage induction motors, e.g.

http://www.amazon.com

and under books, type Induction Motors that will return 48 books

http://www.geindustrial.com/cwc/products?famid=13&SMSESSION=NO

for typical industry motor drive products with applications
or just surf web for more info (sometimes very attractive in colors, animations, academic level, etc.)