Induction motors -400 hertz

[mtrguy]

I have been tasked with designing a 400 hertz induction motor. I am familiar with 60 or 50 hertz designs. This is the first 400 hertz. Reactances will be higher by the ratio of the frequencies.
The rotor bars I believe will need to be close to the rotor OD.

Anybody know any of the differences? Calculations?

 

[sreid]

I don't think that it is possible today to do a good motor design without using motor design software. I'd suggest the Speed Laboratory software distributed in the US by Motor CAD

http://speedcad.com/speed_both.htm

 

[jbartos]

Suggestion: It is good to have several specifications from "would be Clients" to focus the motor engineering and design accordingly so that the motor will be marketable. Visit

http://efunda.globalspec.com/SpecSearch/SearchForm/Motion_Controls/Motors/AC_Motors?deframe=1

http://electronic-contract-manufact...ces/Custom_Motor_Generator_Services?deframe=1

etc. for more info

 

[ozmosis]

I wouldn't know how to design one but I've used a few in the past on wood routing machines and we used a company (German) called Perske. Copy one of these I would say.

 

[aolalde]

mtrguy (Electrical)

You need to hit the books.

As you mentioned all inductive and capacitive reactance’s are increased with frequency. The skin effect on conductors is more critical (keep an eye on strand sizes). The rotor bars will have increased deep reactance. The core losses increase, so very thin laminations of high grade silicon steel are required. For calculations you need a computer aided program, the few commercially available are quite expensive.

 

[aolalde]

Sorry, correction to above:

Inductive reactance Xl = 2*Pi*f*L increases with frequency.

Capacitive reactance Xc = 1/(2*pi*f*C) decreases with frequency.

 

[jbartos]

Comment: The capacitive reactances Xc's will still be relatively high at 400Hz.