Hi I’m building an Ebike and using a reclaimed relay board from an old electric moped. My question is the relay board has 3 small wires presumably for the switch, but this confuses me as I only need 2 for a switch. See picture:
Also why use 8 relays.
Extra info, 1500w hub motor, 2x12v 40ah batteries.
Any advise would be great.
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\$\begingroup\$ An electric moped would use a throttle (probably a potentiometer) to give variable speed control. A switch wouldn't. I have no idea what's going on with the relays. \$\endgroup\$– TransistorCommented Oct 25, 2020 at 17:40
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\$\begingroup\$ Thanks. I’ll try a petentiometer. \$\endgroup\$– SteveCommented Oct 25, 2020 at 17:43
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2\$\begingroup\$ No, try a potentiometer. \$\endgroup\$– TransistorCommented Oct 25, 2020 at 17:45
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1 Answer
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I think it's a 3 wire throttle controller
This board might already consider variable speeds. As for having multiple relays, maybe it has some relay logic going on which creates a stepped output to the motor based on the wire's inputs. You might be able to give a straight signal to the 24V circuit if you want to use a switch, but if you want variable acceleration, I would recommend buying a throttle control.
Image credits: https://support.electricscooterparts.com/support/discussions/topics/1000083529