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-   -   Dual CIM+CIMple box powered bike (http://www.chiefdelphi.com/forums/showthread.php?t=94384)

hipsterjr 25-10-2011 18:06

Re: Dual CIM+CIMple box powered bike
 
Quote:

Originally Posted by Andy Baker (Post 1082576)
That is the FIRST Kit gearbox from 2005, designed by Paul Copioli and sold by IFI. It has an reduction of 12.75:1. So, your overall reduction is 33.8:1. If we multiply this number by your desired max wheel rpm to be 140, then the max motor rpm will be around 4700.

Andy B.

Thanks Mr. Baker. Just checked the free speed of the cim motor which is 5310rpm and the Peak Eff = 4614 rpm.

so 4614(motor rpm) X (1/33.8) = 136.5rpm at wheels

Ether 25-10-2011 18:34

Re: Dual CIM+CIMple box powered bike
 
Quote:

Originally Posted by hipsterjr (Post 1082572)
Off the top of my head I can't remember the stock ratio of the 2005 AndyMark gearbox I used (to lazy to look it up), but from the gear box to the wheel is 2.65 : 1. I do remember that I calculated the wheel RPM to be about 140 at the cim motor's peak torque band (geared way down to climb hills that cover Clemson).

Did you mean peak efficiency band?

140 rpm with a gear ratio of 2.65x12.75 = 33.79 gives a CIM speed of 4730 rpm, which is 89% of free speed

At 89% speed, the CIM torque is 11% of stall and the efficiency is 64.6%

The max efficiency is 64.7% at 4648 rpm


EDIT: I got interrupted while crunching the numbers and after I posted I saw your most recent post clarifying that you indeed meant peak efficiency.

It looks like a lot of fun to ride. Are those 24" tires ?




hipsterjr 25-10-2011 18:50

Re: Dual CIM+CIMple box powered bike
 
Quote:

Originally Posted by Ether (Post 1082585)
Did you mean peak efficiency band?


It looks like a lot of fun to ride. Are those 24" tires ?



26" by 2.2". It is a lot of fun. Going to try to figure out how to mount a 3.5" cim (Haven't used one in years)

toastnbacon 30-04-2012 10:07

Re: Dual CIM+CIMple box powered bike
 
I was thinking about doing something like this as well, would it be feasible to mount a variable resistor to the handle to control speed? I'm not good with motors or electricity at all, but I think it would go a long way for control or safety.

Ether 30-04-2012 10:17

Re: Dual CIM+CIMple box powered bike
 
Quote:

Originally Posted by toastnbacon (Post 1164394)
would it be feasible to mount a variable resistor to the handle to control speed?

http://www.merriam-webster.com/dictionary/feasible

definition 1 yes

definition 2 no1

1 assuming by "variable resistor" you meant a variable load resistor in series with the motor. If you meant a potentiometer to create a control signal to be read by a microcontroller and used as an input signal to an appropriately-sized motor controller, then yes.


toastnbacon 01-05-2012 19:34

Re: Dual CIM+CIMple box powered bike
 
But why not?

Ether 01-05-2012 19:37

Re: Dual CIM+CIMple box powered bike
 
Quote:

Originally Posted by toastnbacon (Post 1165443)
But why not?

I2R




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