ZealousidealSoup
1 µW
- Joined
- Feb 28, 2018
- Messages
- 1
Material:
A 500W / 127V drill, a 12V battery, a 12V / 127V inverter and a bell switch.
Motor:
It would be a drill 500W / 127V / 2800rpm
As 1rpm = 0.105 rad/s and W = Nm x rad/s:
500 = Nm x 2800x0.105, So I would have 1.7 Nm of torque.
By connecting a long shaft to the drill chuck and rolling it with rubber until it has a diameter equal to 1/10 of the diameter of the bike wheel, I would take to the bike wheel a torque of 17Nm and a rotation of 280rpm, axle in direct contact with the bike tire.
With this torque, I believe you can load 100kg on the bike and put it at a speed of 30km/h.
Batery:
It would be a 12V and 60Ah battery, which I believe would keep the 500W drill for over 1h.
Inverter:
As the drill works with 127V and the battery is 12V, I would have to use a 12V / 127V inverter that supports more than 500W.
Accelerator
As an accelerator, a bell switch could be used on the bike handlebar
Conclusion: I compared the cost of this with the cost of a 500W/12V motor for e-bikes and I noticed that the cost of this would be 4 times lower.
Where is the mistake in that?
A 500W / 127V drill, a 12V battery, a 12V / 127V inverter and a bell switch.
Motor:
It would be a drill 500W / 127V / 2800rpm
As 1rpm = 0.105 rad/s and W = Nm x rad/s:
500 = Nm x 2800x0.105, So I would have 1.7 Nm of torque.
By connecting a long shaft to the drill chuck and rolling it with rubber until it has a diameter equal to 1/10 of the diameter of the bike wheel, I would take to the bike wheel a torque of 17Nm and a rotation of 280rpm, axle in direct contact with the bike tire.
With this torque, I believe you can load 100kg on the bike and put it at a speed of 30km/h.
Batery:
It would be a 12V and 60Ah battery, which I believe would keep the 500W drill for over 1h.
Inverter:
As the drill works with 127V and the battery is 12V, I would have to use a 12V / 127V inverter that supports more than 500W.
Accelerator
As an accelerator, a bell switch could be used on the bike handlebar
Conclusion: I compared the cost of this with the cost of a 500W/12V motor for e-bikes and I noticed that the cost of this would be 4 times lower.
Where is the mistake in that?