Thin pancake motor chainwheel mid drive?

[guerney]

Seems pancake motors can be made thinner than these:

Custom axial flux permanent magnet BLDC | Ultra light electric motor

Customize electric motor according to your needs. We offer any size brushless permanent magnet pancake DC motors that can be rapidly tailored to meet your exact specification.

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[Woosh]

the trouble with those pancake motors is their output torque is lower than conventional geared hubs. You'll need to match them with a high reduction gearbox (= bigger loss) for e-bike use.

 

[guerney]

Not thin enough.

• 70 Nm continuous and 210 Nm peak torque
• 0-250 RPM rated speed
• External diameter 310 mm (max), total thickness 82 mm (typ)

Direct Drive pancake motor kit

https://granitedevices.com/oldsite/direct-drive-motors