Very High Speed Electronic Motors
Very High Speed Electronic Motors
(OP)
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
Thanks, Ken Marsh, PE





RE: Very High Speed Electronic Motors
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.
RE: Very High Speed Electronic Motors
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.
RE: Very High Speed Electronic Motors
RE: Very High Speed Electronic Motors
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!
RE: Very High Speed Electronic Motors
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: Very High Speed Electronic Motors
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. 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.
RE: Very High Speed Electronic Motors
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 !
RE: Very High Speed Electronic Motors
RE: Very High Speed Electronic Motors
RE: Very High Speed Electronic Motors
RE: Very High Speed Electronic Motors
http://www.s2m.fr/chap4/index.html
http:/
http://www.reuland.com/product/high-speed.html
http:/
ht
- I've no personal experience of them, though I do know Calnetix (they were very helpful).