Very High Speed Electronic Motors 2

[CCycle]

I would appreciate design information for very high speed 1 to 20 hp electronic motors. Would appreciate reference to text books, web sites, journals or personal experience. The application is combustion air pressurization.
Thanks, Ken Marsh, PE

 

[DickDV]

I don't know exactly what you mean by high speed by you might want to check out Electric Apparatus Co. in Brighton Michigan (I believe that's where they are these days)

They build two pole motors up to about 22,500rpm.

Brace yourself however. These people are exceedingly hard to work with. Believe absolutely nothing about projected delivery schedules. On the other hand, once you manage to get the motor, it usually is well-built.

 

[sreid]

Take a look at the Calnetix website.

http://www.calnetix.com

High speed motor design is that same as low speed motor design. Except (to begin with);

Mechanical; Holding the magnets on the rotor.

Electrical; Using thin, low loss stator laminations to minimize iron losses. In addition, the use of forced air or water jacket cooling.

 

[alexit]

Best company for high speed motor is eunda.ch, founder Rolf Meyer knew more about motors than anyone I ever meet.

 

[TommyOO7]

Did you consider Switched Reluctance Motors (SRM)? They are made for extremly high speeds (> 20,000rpm ). Rotor is made of laminated steel only, no windings, no magnets, nothing, just steel. They have very simple mechanical construction, but must have electronic controller (kind of VSD). Check the Google for manufacturers!

Regards!

 

[jraef]

I still think you need to define "high speed". To some, 3,600RPM is high speed, to thers, it is 20,000RPM.

Eng-Tips: Help for your job, not for your homework Read faq731-376

 

[CCycle]

Thanks for the links and suggestions. My apologies for not being more specific. I am looking for small simple rotors that can be integrated with centrifugal blower wheels needing 50,000 to 100,000 rpm. The Calnetix link, thanks sried, (

http://www.calnetix.com/highspeed.cfm)

describes a 450,000 rpm PM rotor developing 1 KW although their wording makes you wonder if the 1 KW comes at the 450K rpm.

Tommy007, Yes the Switched Reluctance Motor has great prospects as for simplicity and size but you hear that they do not run good. I stumbled on a site today that explained it, for me at least.

http://www.fleadh.co.uk/srm.htm

The problem with a SRM is when it comes time to commute a pole off there is significant magnetic energy in the iron. That energy is going to go somewhere making for inefficiency. PM and wound field motors do not have significant energy left in the iron when it comes time to commute them off hence this in not an issue with them. The SRM controller needs to commute the pole off and then absorb this inductive spike. For the sake of efficiency this energy should be returned to the supply bus.

 

[TommyOO7]

That energy is not lost, that's a problem for electronic converter. Properly designed capacitor can accumulate that energy and send it back in next cycle (or something similar).
But for the speed you are talking about, I don't see any other rotor construction which could be used. I wander what are speed limitations for PM motors?

If sound level is not a problem, I would still recommend SRM !

 

[alexit]

We have running syncrhonous AC motor in products at 125krpm, some asynchronous products run 175krpm (up to 200krpm is special.) High speed is motor winding issue, keeping laminations (or magnets) from flying and having proper motor control for high frequency...

 

[Mendit]

Try these people their products are excellent,

http://www.skf.com/portal/skf_rev/home/products?contentId=079782&lang=en#

 

[axapax]

There is something new with SR- Motors, please see

http://www.plusmotor.de.

This two-phase motor with a new constitution has less noise problems and is suitable for blowers in your speed and power range. The magnetic energy of the switched-off phase pre- magnetises the following one. Storage in a capacitor is not necessary. As production for the first customers will start in some months, maybe they ca also help you.

 

[UKpete]

CCycle, some more links:

http://www.s2m.fr/chap4/index.html

http://www.precise.de/lokation/great_britain_language/english.html

http://www.reuland.com/product/high-speed.html

http://www.kavo-drives.com/english/produkte/spindeln.asp

http://www.polaron-group.co.uk/control-systems/drives-and-controls/nelco/index.htm

- I've no personal experience of them, though I do know Calnetix (they were very helpful).