Controller Huari scooter restricted ?

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ratatouille
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Last seen: 4 years 10 months ago
Joined: Saturday, April 14, 2007 - 02:22
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Controller Huari scooter restricted ?

Hello,

i have a Huari scooter (same design as Emax) and the speed seems limited to about 22mph...
The motor is a 750W WDF and on their website, its speed is "selectionable 35km/h or 50km/h".
So i'm wondering how the speed could be limited ?

1/Throttle : i've looked at the hall sensor and all the magnet is seen by it.
Furthemore, the throttle is no more effective before the end of the rotation.
So if something is limiting, it shouldn't be in the throttle.

2/I made picture of the controller board :
//img122.imageshack.us/img122/4601/boardrectogw8.th.jpg)//img73.imageshack.us/img73/7253/boardversohb9.th.jpg)
I've made red circles where i found unusual things (for me) :
- 2 big shunts (why 2)
- small hard link
- small yellow component
If you see the mysterious restrictor, please tell me.

I measured maxi output current of the battery is 30A.
Scooter on its stand :
Voltage battery at rest: 51.1V
Throttle turned to the max :
Voltage between phase-neutral : 25.4V continuous, 55.8V alternative.
Voltage between Phases : 0V continuous, 37.5V alternative.

My multimeter is supposed to measure RMS value in AC position, but was not an expensive one, so i'm not sure it's very accurate.

3/In the motor : i would prefer not touching the motor for now...

I hope it is a voltage restriction because i want to keep the range.

So if you see something, i thank you in advance.

Jean-François

mf70
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Last seen: 4 years 4 months ago
Joined: Friday, December 1, 2006 - 09:01
Points: 712
Re: Controller Huari scooter restricted ?

Fechter, over at Endless Sphere has done a lot with converting Crystalite controllers to 150V capacity (!!!).

I believe the multiple heavy jumpers are a shunt for measuring amp draw. The multiple wire setup makes the construction more consistent between boards.

If I were looking for speed-limiting circuitry, I'd expect something like a frequency-counter on the hall-effect input.

MarkF

ratatouille
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Last seen: 4 years 10 months ago
Joined: Saturday, April 14, 2007 - 02:22
Points: 61
Re: Controller Huari scooter restricted ?

Thank you for the link, i will read this forum too.

A frequency counter ?
The component under the big pic (SY16.000 written on it) is one or is it a clock ?

Jean-François

Jean-François

mf70
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Last seen: 4 years 4 months ago
Joined: Friday, December 1, 2006 - 09:01
Points: 712
Re: Controller Huari scooter restricted ?

As far as analyzing the board to find the spot where the speed limiting happens, I'm afraid it will require a high level of knowledge and electronic sophistication, unless the board designer has given you a gift and stenciled "speed control jumper" somewhere on the board. An example of exactly that sort of analysis is at: http://endless-sphere.com/forums/viewtopic.php?t=764

That board is populated with surface mount devices (small and hard to read) and integrated circuits (complex function).

My thought about counting frequency was made without either knowledge or electronic sophistication.

I've got a burned out controller myself. I'm hoping that because it has no IC's, it will be easier to trace the circuit and perhaps find the fault.

MarkF

ratatouille
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Last seen: 4 years 10 months ago
Joined: Saturday, April 14, 2007 - 02:22
Points: 61
Re: Controller Huari scooter restricted ?

yes, i went on this forum and read this thread after you indicated it to me.
i've posted a message too and Fechter began to answer. He has doubts about the small shunt but is not sure.
The seller of my scooter is searching too.

Don't worry, if i burn something, i'll beat myself and not people who are trying to help.
I will be very carefull anyway as i really need this scooter.

Jean-François

Jean-François

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