Stacking PMSM Stators and Rotors

[cnafets]

Hello PF!

This is my first post in a while, and I am pretty excited to hear what you guys think about my idea. I have a couple of BLDC design books that I'm going to tear into, but I like hearing from other people.

My idea involves the creation of a single, more powerful electric motor from multiple smaller motors/generators. More specifically, the Honda IMA system.

My idea involves making this system as compact, power dense and efficient as possible. I'd like to water-cool the stator as it would be going into a vehicle and increase motor run time as they are not designed for constant run duty.

So here we are. Should the individual IMA motors be disassembled and stacked as close as possible, allowing space for tolerances of course. They would keep their individual stator windings and be wired in parallel to the inverter.

OR

Should the stators be rewound as a large, single stator? Would that give me more torque or increase my torque per amp?

Do you guys see any negatives about the close proximity of the magnetic fields interfering with each other?

Also, with the individually wound stators, could I offset the stators to reduce cogging?

Thank you!

 

[CWatters]

Pretty sure that joining lots of small motors together is not going to produce the most efficient large motor.

I can't say for sure but I'd be surprised if the inverter was happy driving several times it's rated load.

 

[cnafets]

That's what I believe as well, but would it make more than a 2% difference or so in this case? IOW, will it be a noticeable gain in the overall motor?

The inverter would be designed to output well beyond what will be asked of it in this system.