Hey guys. Could any of you give me some help on how to start calculating the power rating needed to run the electric bicycle.
The only given parameters are:
-Able to achieve 20mph on flat
-Can neglect wind resistance and friction.
-Person weighting 80kg.
The task is to select appropriate motor to be able to achieve that speed and the calculations must be provided.
Many assumptions can be made .
Lets assume that i want to accelerate to 20ms in 5 seconds. Newtons law:
F=m*a= 80kg *(20/5) . Thats the force i will need to accelerate to 20 mph.
Now i can calculate the torque that i need to generate using torque and force equation below:
T=F*r
T-torque
F-force
r-tire radius
Okay assuming i have calculated that torque. That will be the torque needed to achieve 20mph, but how do i know if the torque to remain constant speed at 20mph will remain the same?
What would be the other step to calculate the motor power rating
The only given parameters are:
-Able to achieve 20mph on flat
-Can neglect wind resistance and friction.
-Person weighting 80kg.
The task is to select appropriate motor to be able to achieve that speed and the calculations must be provided.
Many assumptions can be made .
Lets assume that i want to accelerate to 20ms in 5 seconds. Newtons law:
F=m*a= 80kg *(20/5) . Thats the force i will need to accelerate to 20 mph.
Now i can calculate the torque that i need to generate using torque and force equation below:
T=F*r
T-torque
F-force
r-tire radius
Okay assuming i have calculated that torque. That will be the torque needed to achieve 20mph, but how do i know if the torque to remain constant speed at 20mph will remain the same?
What would be the other step to calculate the motor power rating