Canadian tire 2007 schwinn izip electric bike 250 or 450

[its_me_jason]

Here is some statistical data on the (United motor MY1018Z motor) a 250W, and a 450W at two different voltages
correction Oops, my bad.... I thought it was a chart of TWO MOTORS at different voltages. Its actually FOUR MOTORS at different voltages....

24V (what im currently running) and a
36V (what I want).

Unite Motor DC MY1018
Voltage/V------------------24V ----------36V-----------24V--------------36V
Rated Power/W-----------250W---------250W--------450W-----------450W
No-load Current/A-------<2.2 ---------<2.0----------<2.5-------------<2.2
No-load Speed/RPM------3150 --------3150----------4000-------------4000
Rated Torque/Nm------0.87 ---------0.87---------1.43--------------1.43
Rated Speed/RPM--------2750---------2750---------3000-------------3000
Rated Current/A---------<13.4---------<9.0---------<24.7------------<16.5
Eff./% -------------------->78------------>78---------->78------------- >78


- I want to up grade my battery from the factory SLA pack. Problem is I’m not even sure if I have a 450W motor any more because apparently these two motors are identical from the outside.

-My question here is, how can I tell which one of these two motors are mounted on my bike before I make a battery choice?

 

[neptronix]

check the amperage of your controller.

If it's 35 amps, then the peak wattage is 24 x 35 = 840W.
They'd never design a 250W motor to push that kinda peak power. It'd melt!

 

[its_me_jason]

My current controller is 35 amps. So currently my peak wattage is 24V x 35A = 840W

So that means I must have the 450W motor, thanks that’s great news!

Now if I upgrade to 36V, am I reading the chart correctly, that my 450W motor should only be fed a max of 16.5 amps or less?

 

[neptronix]

No, that's not how it works.
The 36v motor is a different motor, which produces a lower RPM per voltage than your 24V motor. Therefore, on the same amount of volts, you can see that it produces the same RPM.

Your motor produces 125RPM per volt, therefore at 36 volts, it will spin at 4500RPM.

By going faster, the motor will use more power, and you will exceed the rated current at the top speed that the motor will go on the higher voltage. This will create more motor heat if you stay at full throttle on 36v. Some users of eZips have burned out their motors doing that on 36V, probably when climbing hills or doing something of that sort.

We do this a lot with our hub motors, but those small brushed motors don't take overvolting as well.

 

[its_me_jason]

Oops, my bad.... I thought it was a chart of TWO MOTORS at different voltages. Its actually FOUR MOTORS at different voltages....

what if I downgrade the 24V 35A controller with a 36V 25A controller, like this one.

http://tncscooters.com/index.php?route=product/product&path=41_74&product_id=172

when I upgrade my sla's, I wouldn't need a ping 36V 20AH battery any more i could down size to say a ping 36V 15AH or even 10AH battery, does this sound right?

 

[neptronix]

what if I downgrade the 24V 35A controller with a 36V 25A controller, like this one.

http://tncscooters.com/index.php?route=product/product&path=41_74&product_id=172

when I upgrade my sla's, I wouldn't need a ping 36V 20AH battery any more i could down size to say a ping 36V 15AH or even 10AH battery, does this sound right?

You'll end up with a slower bike by doing that. It'll be slower from a stall, it will fall behind when climbing hills, and never reach the top speed that the voltage is capable of putting out. You'd need a 20 amp controller to be able to use a 10AH ping ( maximum continuous is 20 amps ), which would be even slower than what you have.

I'm not sure why you want to go with 36 volts, why don't you stick with 24v? a 24v 20AH battery isn't all that expensive.

 

[its_me_jason]

Ya Neptronix I guess your right..... I have a 25 miniute ride to work right now, and I was just looking forward to travelling 25 miles an hour on the four minute straights. It would put a bigger smile on my face!

 

[neptronix]

Ya Neptronix I guess your right..... I have a 25 miniute ride to work right now, and I was just looking forward to travelling 25 miles an hour on the four minute straights. It would put a bigger smile on my face!

Oh - 25 miles per hour? that's around 750W continuous, maybe more on that motor. You've got a motor that will eventually overheat on that kind of power.

I didn't know you wanted to go faster. If you mentioned that before, sorry that i missed it.
If you want to understand this a bit better, check out the ebikes.ca simulator.

http://ebikes.ca/simulator/

You can play with different motors here and find out how much power is used at various voltages at various speeds.

There are some modifications for eZip/iZip bikes like these which push them to maybe a hair over 20mph but 25mph is just too much for that motor.

I had an iZip just like yours and remember the motor getting warm/hot on just 24v when climbing hills and such.

 

[its_me_jason]

wow cool tool! thanks!

 

[puddleglum]

I was just just given a Izip identical to the OP's bike in the first post. I assumed that the motor was brushed (2wires to motor) but the 35a controller says it is a brushless controller. Are they using a brushless controller with a brushed motor or is the motor really brushless?