Mathurin cheap hubmotor - stock controller - 48V??

[sabrewalt]

Curosity got the best of me. I had 4 new 7AH SLA batteries and connected them together and tried 48 Volts on the Mathurin mod Kingsmotorbike.com controller. I have no voltmeter onboard. It measured 51 volt before the ride and 50 after. It would cut out after about 3 seconds of opening the throttle. Was just wondering what would happen. May try it again after getting an onboard voltmeter. That will be for another time. Putting the big 14 AH batteries back on and enjoying. Oh Well

 

[knightmb]

Curosity got the best of me. I had 4 new 7AH SLA batteries and connected them together and tried 48 Volts on the Mathurin mod Kingsmotorbike.com controller. I have no voltmeter onboard. It measured 51 volt before the ride and 50 after. It would cut out after about 3 seconds of opening the throttle. Was just wondering what would happen. May try it again after getting an onboard voltmeter. That will be for another time. Putting the big 14 AH batteries back on and enjoying. Oh Well

Do you know if the controller feels hot? It might be overheating and the safety is cutting off the controller until it cools down. I couldn't find anything about the controller on the website? Have any links?

 

[sabrewalt]

Bad storming here so I could only go out for a few minutes before the rain arrived. Can't imagine that it is getting hot in 3 seconds.

I should probably leave it alone. Getting 19MPH on a flat now with the Mathruin mods. BTW they were out of stock on these. Looks like they got some more.

 

[sabrewalt]

http://www.kingsmotorbikes.com/Electric_bicycle.htm

 

[knightmb]

http://www.kingsmotorbikes.com/Electric_bicycle.htm

Unless the components limit it exactly to 36 (or 14X3 = 42 volts for a full charged pack) I don't see why it would cut out at 48 volts.

 

[sabrewalt]

A voltmeter would be very useful during the test.

 

[Mathurin]

oh, yeah.

The low voltage regulator for the driving circuitry had a 42v limit on mine.
I bet it's not super-happy at 50-ish...

You could try tapping 3 12v bats to finer circuitry and leaving the juice from all 4 batteries go into the FET side.

 

[fechter]

The battery voltage might be sagging a lot under load, tripping the low voltage cutout.

 

[sabrewalt]

Mathurin, Are you going to try to buy another controller from Kings now that he has stock??

 

[Mathurin]

No, It's likely I'll eventually get around to fixing the one I have.

 

[29a]

would this motor work with the crylte contoller (48V 35A) ?
anyone know how it compares speed/torque to the 400 series ?

 

[Mathurin]

Well, the hall sensors aren't placed the same way...

Kingsmotorbikes hub motor:

Crystalyte 408:

I'd give it a try anyways, somehow I don't expect it would work.

 

[fechter]

I think it will work.
It almost has to, since it's still a 3 phase setup.
You just need to make sure the hall and phase wires are matched up correctly.

It looks like they used bamboo to make the keepers in the slots.

 

[sabrewalt]

Well I charged up those SLA'a again and put 3 in instead of 4. It still cut out. So the problem is not the controller. It's gotta be the batteries... Those were 7AH if you remember. I put my three 14 Ah batteries back in and all is well.

 

[Mathurin]

How about three series 14ah + two parallel 7ah?

 

[sabrewalt]

Have to settle for driving around on a flat back tire(tyre)

 

[solarbbq2003]

if the hall sensor voltage is 12volt from controller, it will work,
if its 5v you have a problem
hall sensors have middle one upside down is 120degree same as crystalyte
if they were all up same way would be 60degree hall sensor spacing
you your hall sensors are 5v not 12volt you can use the 5v power from throttle to run the hall sensors ( i think! )