March of Electric Technology

[George S.]

This is pretty technical but it gives you a sense of what is going on in electric transport. Most of the issues apply to ebikes, and more to small scooters.

 

[Jim123]

The speed of the rate of direction switching on the magnets, the thinness of manufacture to prevent waste(lower cost) and increase energy density. Makes me think maybe that is how the Stromer 2 sport is making a motor that makes no noise. I would love to find out what the real answer for the cause is.

 

[Cameron Newland]

The speed of the rate of direction switching on the magnets, the thinness of manufacture to prevent waste(lower cost) and increase energy density. Makes me think maybe that is how the Stromer 2 sport is making a motor that makes no noise. I would love to find out what the real answer for the cause is.

Aren't all direct-drive hub motors silent? The only noise that should come from a direct-drive hub motor is from the spinning freewheel bearings (and that should be minimal) and the air drag on the wheel spokes. The only thing that makes an audible noise on any hub motor should be the gears in a geared hub motor, but the Stromer ST2 motor doesn't have any gears.

 

[George S.]

On the Mac geared drive, the clutch chatters, or cycles, at decent speeds if you try to ease off the throttle. Annoying if you come up on people on a bike path. If you back off or give more power, it's quiet.

Get your hands on a Mac gear drive, a Golden Motor DD, and a Bafang BBS and that's the DIY world. GM Canada does the Goldens, Luna is big in BBS and Paul is the Mac man, EM3ev. All are solid motors.