Controller identification / speed limit

live5

1 µW
Joined
Apr 14, 2018
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2
I wonder if anyone know this controller, mainly if it is somehow speed limited. I run this with throttle and had to disconnect yellow wire outside the controller to make it work on throttle without pas (I broke the PAS sensor, so I diconnected it). I tried to disconnect the white wire inside the controller, but i had to solder it back together, because it was not running at all disconnected.
It runs 25-26 km/h on throttle only in that way, that the power is fading - not that you can feel that it disconnects power right after it reaches 25kmh or so. It is paired with 36v 10ah battery and motor is rear hub 8fun branded (in 26 wheel), but I could not find more specific info on it.
 

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Speed limited by the laws of physics mostly. 250w gets you about 15 mph max, so you are getting all the controller gives. You need more watts to overcome air resistance and go faster.

Electric motors pull hardest at 0 rpm, so you feel the power at start, then it seems to fade at 15 mph. This is due to the nature of electric motors. As they reach the fastest rpm the controller and voltage will allow, power drops off.

So everything is normal for your controller. you could improve performance by another 5 mph or so, with a 500w controller.
 
thank you for answer, but i think it is the motor on its max rpm or the controller, cause its 15A original + soldered shunt a bit. so i think the power will be around maybe 700W with 36v battery and the speed is still the same
 
700w would get you more like 20-25 mph possible, like wind resistance and wattage needed for that speed. But speed might still be limited by the motor itself, the number of turns in the winding, combined with wheel diameter.

So if the motor is wound slow, it will be slow, unless you drastically increase voltage, not just wattage.

It could also be slow for other reasons, like the controller got damage at some point, or just is wearing out. I have had controllers do a slow blow, where they faded, then finally stopped. And other problems also cut your actual power in half, or more.

Sometimes a motor has a winding count written on the inside, after you take it apart, if you really want to get to the bottom of this. But the standard way to get more speed, is always increase the voltage, so 48v battery and new 48v controller to go with it is your best bet. Might still be relatively slow though, if you have a slow motor.
 
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