Running a 36v motor on 24v.

[GeoKrpan]

I have a complete Currie kit with 24v 450w motor.

I want to modify the kit to turn a crank on the left side of the bike.
I am worried that it will turn the cranks too quickly.
It will be too quick even with a 53 tooth chain ring and a 13 tooth freewheel.

The 36v version of the motor has the same output shaft speed as the 24v motor.

The idea is to run a 36v motor on 24v to slow down the output shaft speed.

Can it be done?

In case you were wondering, I'm working on a freewheel adapter for the Currie D-shaped
motor shaft.
If you have any ideas about this I'd like to hear them.

 

[spike]

Don't know about running the motor at 24V, but what about having the teeth of the left side crank sprocket match the Currie drive chain? The #25 sprockets and longer length chains can be bought from the online scooter shops. That way you could keep the existing planetary gear box and run the motor without mods.
HTH

 

[GeoKrpan]

I thought of using #25 chain but I really want to use standard bicycle components.

The latest version of the Currie kit uses regular bicycle chain not #25 chain.
The cog on the motor is fixed but the gear on the wheel is a freewheel.

 

[vanilla ice]

The motor will pull the same amperage so you will have 2/3 the power.. but it should work fine on the lower voltage.

 

[GeoKrpan]

That's what I wanted to hear.

At 2/3rds power I would still get 300w which should be adequate.
I thought of using the 24v 250w version of the motor. It has a output shaft speed of 382 versus 550 for the 24v 450w and 36v 450w.
2/3rds of 550 is 367, not a whole lot slower than 382 but a useful reduction nonetheless.