Recent content by Vbruun

I somewhat agree. If you just want power, I think you should buy a qs mid mount motor and get it over with. What the lightest really brings for me is the promise of good torque sensing in a high quality drive that could be reliable. Still hoping it will end up like that one day :)

Great points. Buying the lightest ever motor to pair it with a heavy hub is kind of backwards. But honestly, I only think the lightness of this drive is relevant in eMTB applications. Otherwise, the massive battery needed for range at speed will outweigh the ligness gains anyways.

The nexus 5 only has overdrive ratios. 1:2,6 in 5th gear. https://www.bike-discount.de/en/shimano-nexus-sg-c7002-5cd-5-speed-internal-geared-hub

The 5 speed is probably strong enough. It is used with the big Shimano motor which pulls 5-700w peak and then geared for a top speed of about 18 mph. If you want to gear twice as steep for that sweet 36 mph top speed, you can use twice the motor power with the rear hub seeing the same torque.

This is not true. A bldc motor still needs to have commutation via PWM even if run at full throttle/voltage. If the duty cycle is low and the motor is low inductance, some losses will increase, but I would need to see data to believe that this is a significant issue. Freeing yourself from...

You can model the efficiency of a motor via Grin motor simulator if you can get the necessary information. Also, you can try playing around with the settings to get a feel for how things influence each other. Motors generally aren't most efficient when run at close to max power, so if you...

Is weight a concern?

Good point!

This is the way the open source firmware works. the PID is a bit slow and you feel resistance when turning the wheel backwards because computation is never turned off. Stancecoke says that the PID is fine when moving fast and there is no extra resistance when coasting using this method. If...

I think they would not work that well. The motor torque would feed back into the bottom bracket i think.

Would a nursert in the frame be sufficient to hold the motor in stead of clamping around the downtube?

Why do you want to use hub motors? Induction motors are way cheaper and run on the right voltage for grid use.

Probably the strain gauge has come loose. It can be fixed but it takes skill and patience

It does convert the voltage. That's why they don't

I have used a cheap st-link v2 copy dongle. I don't think it matters which controller you use the firmware on. I have no first hand experience with the 6-fet, but since it is rated for lower current by KT I would think that the 9-fet can take a bit more. The phase current is limited by the...