This my build with MY1018 motor:
This mid-drive system is similar to Vivax Assist so when motor is running it all the time moves with crank (so I can not use the motor without pedaling), but when I pedaling, the freewheel on the left side disconect crank from the sprocket wheel so the sprocket wheel, the chain 219 and the motor is not rotating and there is no any drag. This system is suitable for "active" pedaling bikers. I use 36V version of MY1018 motor together with 12S Lion battery and the crank cadence is around 80 - 90 rpm, that is very pleasant. In this combination the maximum power of motor is around 650W, but how I can observe in wattmeter, the power of motor (and Amper consumption) mainly depends on my actual gearing on derailleur - longer (harder) gearings = more Amps) and vice versa. My normal consumption is around 4 - 6 A (200 - 300W power), but with my big human power assist. There is no any heat issue with motor.
450W Brushed MY1018 motor may seems very "prehistoric" traction unit, but has some very nice features: It is cheap, it is very leightweight (around 2,2 kg), the controller for that motor is also very cheap and simple and this motor can be tuned to 600W (with no heat issue when is proper geared down). I have used sucessfully this motor in my other electric bike projects. The only drawback of this motor is sound of its gearbox (with straight cog wheels) that is similar to gas turbine... but I like it anyway.
Like primary chain I use very robust (but expensive) 219 chain that has small segment module so you can achieve better gear ratio and also this chain manage big moment from geared motor. The freewheel is ACS screwed into left crank. On the right side I use 1 x 8 gearing system, because bike chain for 8 gearing system is significantly wider than for 9 or even 10 gearing bicycle system and is better for mid-drive. The controller is hiden under the seat. The motor holder is made from Aluminium. I use thumb a accelerator on left side on the handlebar.
I use this bicycle with my own 12S6P battery located in backpack, because I like this configuration for very lightweight feel. The Bike without battery is really very light...
This mid-drive system is similar to Vivax Assist so when motor is running it all the time moves with crank (so I can not use the motor without pedaling), but when I pedaling, the freewheel on the left side disconect crank from the sprocket wheel so the sprocket wheel, the chain 219 and the motor is not rotating and there is no any drag. This system is suitable for "active" pedaling bikers. I use 36V version of MY1018 motor together with 12S Lion battery and the crank cadence is around 80 - 90 rpm, that is very pleasant. In this combination the maximum power of motor is around 650W, but how I can observe in wattmeter, the power of motor (and Amper consumption) mainly depends on my actual gearing on derailleur - longer (harder) gearings = more Amps) and vice versa. My normal consumption is around 4 - 6 A (200 - 300W power), but with my big human power assist. There is no any heat issue with motor.
450W Brushed MY1018 motor may seems very "prehistoric" traction unit, but has some very nice features: It is cheap, it is very leightweight (around 2,2 kg), the controller for that motor is also very cheap and simple and this motor can be tuned to 600W (with no heat issue when is proper geared down). I have used sucessfully this motor in my other electric bike projects. The only drawback of this motor is sound of its gearbox (with straight cog wheels) that is similar to gas turbine... but I like it anyway.
Like primary chain I use very robust (but expensive) 219 chain that has small segment module so you can achieve better gear ratio and also this chain manage big moment from geared motor. The freewheel is ACS screwed into left crank. On the right side I use 1 x 8 gearing system, because bike chain for 8 gearing system is significantly wider than for 9 or even 10 gearing bicycle system and is better for mid-drive. The controller is hiden under the seat. The motor holder is made from Aluminium. I use thumb a accelerator on left side on the handlebar.
I use this bicycle with my own 12S6P battery located in backpack, because I like this configuration for very lightweight feel. The Bike without battery is really very light...