Hello,
I know that direct drive gearless hub motors have some sort of drag, and is often used for regenerative braking. I'm looking at the Crystalyte NSM 13 motor specifically, from Canada's Grin Technology at ebike.ca. Apparently it's out of stock, but if they do restock, I am interested in this motor.
I looked at their motor simulator on ebike.ca, and it seems like at higher speeds, the torque drops and even goes negative! Does this mean that at very high speeds the motor will slow you down?
Additionally, does the motor have drag, if for example, my battery runs low and as a result a very low voltage is run to the motor, or I need to reduce the thottle or pedal assist to maintain battery levels and I try to pedal faster than its unloaded speed at this reduced power? Again, from the motor simulator, it seems there is always some residual drag force if the motor isn't powerful enough for said speed.
Lastly, does running a higher voltage minimize this negative torque at higher speeds, while keeping the throttle lower to maintain the same output power? I modeled both 36V and 48V battery packs on the NSM 13 motor and simulator indicates that motor drag kicks in later as the torque line is translated to the right (increased torque at all levels for a given speed).
Motivation
I'm looking to run a low power build, as I want just a 'little' boost but keeping the bike as light as possible, as after trying out some e bikes, I don't really need 500+ Watt motors for what I'd like to ride
I know that direct drive gearless hub motors have some sort of drag, and is often used for regenerative braking. I'm looking at the Crystalyte NSM 13 motor specifically, from Canada's Grin Technology at ebike.ca. Apparently it's out of stock, but if they do restock, I am interested in this motor.
I looked at their motor simulator on ebike.ca, and it seems like at higher speeds, the torque drops and even goes negative! Does this mean that at very high speeds the motor will slow you down?
Additionally, does the motor have drag, if for example, my battery runs low and as a result a very low voltage is run to the motor, or I need to reduce the thottle or pedal assist to maintain battery levels and I try to pedal faster than its unloaded speed at this reduced power? Again, from the motor simulator, it seems there is always some residual drag force if the motor isn't powerful enough for said speed.
Lastly, does running a higher voltage minimize this negative torque at higher speeds, while keeping the throttle lower to maintain the same output power? I modeled both 36V and 48V battery packs on the NSM 13 motor and simulator indicates that motor drag kicks in later as the torque line is translated to the right (increased torque at all levels for a given speed).
Motivation
I'm looking to run a low power build, as I want just a 'little' boost but keeping the bike as light as possible, as after trying out some e bikes, I don't really need 500+ Watt motors for what I'd like to ride