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  1. maxmitchell

    high RPM / high frequency 50kW PM generator sizing

    I think that I can make a rotor of PMs spin that fast. I might have to wrap it in Kevlar or carbon fiber to take the centrifugal forces. I know, that will hurt my "air" gap, but this is part of the plan. I just have no earthly idea how axially long it should be, given a (centrifugally...
  2. maxmitchell

    high RPM / high frequency 50kW PM generator sizing

    Thank you guys for the feedback! let me clarify a few points... While it would be great to find an off-the-shelf solution for my electrical power goals, I am not counting on this happening. I have a decent machine shop in my garage (CNC mill, lathe, surface grinder, TIG welder, etc), have...
  3. maxmitchell

    high RPM / high frequency 50kW PM generator sizing

    sorry about the double post. I deleted the other one. One of the primary design constrains of this project is to avoid gear reduction. That "micro" turbine project I worked on for 5 years... It sent about 15 kW through a 2-stage gear reduction system. The turbine input shaft spun around...
  4. maxmitchell

    high RPM / high frequency 50kW PM generator sizing

    Short Version: I am looking for a set of equations to help size a permanent magnet (PM) generator. The power goal is 50 kW at a speed of about 95,000 RPM. I suspect that due to the high RPM, it would be best to reduce the pole count on the rotor as much as possible, so probably a single North...
  5. maxmitchell

    directly wire generator to motor to facilitate speed reduction?

    Skogsgurra, you mentioned: "This kind of a solution was used BVFD (Before Variable Frequency Drives). Ususally in reverse order (high speed spindles for grinding Tools etc) and it should work also for speed reduction. " I understand what you mean, but I would like to research the nuances...
  6. maxmitchell

    directly wire generator to motor to facilitate speed reduction?

    Fan needs 15 kW
  7. maxmitchell

    directly wire generator to motor to facilitate speed reduction?

    The product operates away (sometimes very far away) from mains power sources. So here is where my lack of EE knowledge will be obvious, but I thought that with high voltages (a couple hundred) and high frequencies (which would happen naturally in my case?) the motor mass would stay low. Such...
  8. maxmitchell

    directly wire generator to motor to facilitate speed reduction?

    David, I have a 42 pole alternator stator that I was considering using for an initial performance demonstrator (assuming I can find a squirrel cage rotor to fit snugly inside it). It is about 7 inches OD and 1 inch thick. It would probably be only an order of magnitude less power output than...
  9. maxmitchell

    directly wire generator to motor to facilitate speed reduction?

    this is my first post, sorry it it's in the wrong spot. I am working on redesigning a high speed gearbox, and would like to get away from gears all together. For this application thermal efficiency is absolutely NOT important. The high speed turbo-alternator spins at about 130,000 RPM. the...

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