- #1
Low-Q
Gold Member
- 284
- 9
Hi there :-)
I got that crazy idea to make regeneration of electricity on my e-bike when the bike runs downhill, by using its motor as a generator when the throttle is off.
My e-bike is custom made by myself. The motor is located in the front wheel hub, and it provides 7 Volt 3-phase voltage increase for each 10km/h increased - when used as a generator.
I plan to use a powerful step up converter that runs from 10 - 60 VDC input. So I want to connect a 3-phase rectifier to the three wires that goes to the motor, and feed the step up converter.
The step up converter can deliver a steady 45VDC output as long as the input voltage is 10VDC or more input.
What my concerns is about, are the possible "short circuit" scenario when that converter is connected to the BMS and the motor. Because the converter wants to deliver 45V out, while the same wires from the battery, via the BMS delivers 42V to the ESC when the battery is not connected to a charger.
A BMS is a circuit that controls charge and discharge current, while it is balancing each of the 10 cells.
The drawback, is that the converter delivers 45V also when the bike is using its motor, forcing 45VDC input to the ESC.
Should I have a switch on the breaks or something that disconnect the converter when I do not need charging, or will the circuit work fine without a switch?
If you are an electronics engineer, I would be very happy if you could provide some information on how this is suppose to work.
I got that crazy idea to make regeneration of electricity on my e-bike when the bike runs downhill, by using its motor as a generator when the throttle is off.
My e-bike is custom made by myself. The motor is located in the front wheel hub, and it provides 7 Volt 3-phase voltage increase for each 10km/h increased - when used as a generator.
I plan to use a powerful step up converter that runs from 10 - 60 VDC input. So I want to connect a 3-phase rectifier to the three wires that goes to the motor, and feed the step up converter.
The step up converter can deliver a steady 45VDC output as long as the input voltage is 10VDC or more input.
What my concerns is about, are the possible "short circuit" scenario when that converter is connected to the BMS and the motor. Because the converter wants to deliver 45V out, while the same wires from the battery, via the BMS delivers 42V to the ESC when the battery is not connected to a charger.
A BMS is a circuit that controls charge and discharge current, while it is balancing each of the 10 cells.
The drawback, is that the converter delivers 45V also when the bike is using its motor, forcing 45VDC input to the ESC.
Should I have a switch on the breaks or something that disconnect the converter when I do not need charging, or will the circuit work fine without a switch?
If you are an electronics engineer, I would be very happy if you could provide some information on how this is suppose to work.