Jil
1 kW
This subject can sound weird. Why would you want a GMAC to limit it to 250 watts ?
Actually, I'm thinking about building an hardtail eMTB (or eFAT, I've not decide yet) with steel frame and rear motor. Not for me, but for sale in small serie. For the moment, it's just an idea, not a concrete project.
Then the idea is to keep it "street legal" as per UE criteria, i.e. 25 kph and 250 watts nominal power.
For a mountain bike, the 25 kph is not really an issue, as you need the motor mainly on hills.
The GMAC seems to me a good choice to have strong torque, durability (especially when limited to 25 km/h), limited weight and size, and regen.
Concerning the power limit, it's tricky, because all manufacturers of central motors (Bosch, Brose, Shimano...) sell their motor as "250 watts nominal power", but everybody knows that the maximum power can be much higher (and sustainable for a long time), up to 700 watts or more.
The question is the definition of "nominal". A GMAC motor would be difficult to brand as "250 watts", but is there a specific setup that could be implemented in the controller to make it as "250 watts nominal" ? i.e. able to maintain higher power but just for limited duration (let's say 800 watts for 15 minutes) ? Could this be made with a Phaserunner ?
Setting the temperature limit at a low level (like 80°C) could be a way to limit the ability of the motor to handle strong power for a long time.
Or any other idea ?
Actually, I'm thinking about building an hardtail eMTB (or eFAT, I've not decide yet) with steel frame and rear motor. Not for me, but for sale in small serie. For the moment, it's just an idea, not a concrete project.
Then the idea is to keep it "street legal" as per UE criteria, i.e. 25 kph and 250 watts nominal power.
For a mountain bike, the 25 kph is not really an issue, as you need the motor mainly on hills.
The GMAC seems to me a good choice to have strong torque, durability (especially when limited to 25 km/h), limited weight and size, and regen.
Concerning the power limit, it's tricky, because all manufacturers of central motors (Bosch, Brose, Shimano...) sell their motor as "250 watts nominal power", but everybody knows that the maximum power can be much higher (and sustainable for a long time), up to 700 watts or more.
The question is the definition of "nominal". A GMAC motor would be difficult to brand as "250 watts", but is there a specific setup that could be implemented in the controller to make it as "250 watts nominal" ? i.e. able to maintain higher power but just for limited duration (let's say 800 watts for 15 minutes) ? Could this be made with a Phaserunner ?
Setting the temperature limit at a low level (like 80°C) could be a way to limit the ability of the motor to handle strong power for a long time.
Or any other idea ?