Electronics > Projects, Designs, and Technical Stuff
Making an induction motor go crazy fast.
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max_torque:
The motor i helped develop for the Mclaren P1 and then used in FormulaE runs at over 20,000 rpm and has an internally water cooled rotor, where the water/glycol mix is pumped into and out of the rotor spining at that speed!  The sealing in particular gave me most of the gray hairs on my head i now have........
Berni:

--- Quote from: max_torque on September 01, 2019, 01:44:41 pm ---The motor i helped develop for the Mclaren P1 and then used in FormulaE runs at over 20,000 rpm and has an internally water cooled rotor, where the water/glycol mix is pumped into and out of the rotor spining at that speed!  The sealing in particular gave me most of the gray hairs on my head i now have........

--- End quote ---

Dang i had no idea they would watercool the rotor. So the rotor shaft is hollow and the stuff is pumped in on one end and flows out the other? Indeed sounds like a sealing nightmare at those speeds even tho i have no clue about mechanical engineering.

Oh and in terms of overloading the windings before the motor gets to a fast enough speed to self destruct i just remembered that you can increase the input voltage at higher frequencies and induction motors usually like running with as much voltage as possible as long as they don't saturate. So you could likely safely double or triple the input voltage before getting into any insulation breakdown problems. This lets you put more power into it before the windings overheat(since that's purely current related)
Circlotron:
^^ Yep, dead right. Similar to raising the frequency and voltage with an iron cored transformer to get more throughput. Maximum transformer current is still the same, as is maximum motor torque, but you could double or triple the voltage proportionally with frequency same as you can double or triple the rpm, leading to double or tripe the watts output of both. One limiting factor would be losses in the iron core. But it's fun to see just how far you can go without causing damage.
dom0:

--- Quote from: coppercone2 on August 29, 2019, 10:24:15 pm ---
--- Quote from: Yansi on August 29, 2019, 03:44:44 pm ---Welcome to the world of VFDs. Since the 1980s or when...

--- End quote ---

nothing ruins your day more then 'i need a 200$ vfd to use this totally cool motor I spent 3 hours removing from a washing machine I found on the street so I can do a weekend project'.

I hate them. Thought you were in the clear ? no way, now its time to figure out which expensive 200$ mystery box won't blow up for your shoe shiner you can buy for 25$.  :P

--- End quote ---

Welcome to Europe, where you can just plug it in.
dom0:

--- Quote from: Yansi on August 30, 2019, 06:53:52 pm ---Fan torque goes up square wit rpm.

On thw other hand no problem removing it ;)

--- End quote ---

Fan is internal and is part of the dynamic balancing -> remove fan, bye bearings.
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