I have an old scooter that ran well with a hall effect sensor throttle, at least until my son crashed it into a hedge.
The throttle wires broke, so I took it apart to repair it. Whle doing so, I broke the wires off of the sensor. So, I ordered a couple replacement sensors (UGN3503U shipped from Hong Kong). They're smaller than the original, but same part number. I carefully soldered one in the manner that it apparently should've gone in; but I could not get it to work. Waving it around a magnet and moving it around in the throttle, I could barely get the output voltage to budge by 0.1 volt or so. I swapped pins 1 & 3 (+5 and output) but that didn't do much at all.Thinking that I'd perhaps burned it out by initally have 1&3 swapped, I tried my second part, with 1&3 swapped from the first go around, then when that did nothing, I swapped 1&3 yet again. So now, I probably have 1 broken sensor and 2 burned out sensors… Scooter is still not working… Laddie not happy...
SO - I decided to look for a whole new throttle. The existing throttle looks identical to several Chinese hall effect sensor throttles that are for sale on many websites (about $20USD). HOWEVER, while I was trying to get my repairs to work, I noticed that shorting the output to GND makes the motor run full throttle, while shorting the output to +5v (or leaving it disconnected) leaves the motor idle (stopped).
This is where I hope that some experienced chaps here can assist… (I'm assuming that pedelec throttles are very much like electric scooter throttles.)
Isn't this backwards? From the info that I can gleen from the web, the voltage for full throttle should normally be up at +4volts, while +1volt should be stopped. My controller is expecting the reverse of that. Low (i.e 0)volts is full throttle, while high (+5) volts is stopped. Which way is, in fact, "normal"? And is my throttle "normal"?
I believe that it was flecc that said, in another post about a broken throttle, that flipping a magnet (or two) in the throttle can change the "polarity" of the throttle. It seems that if I purchase a new throttle, I may have to do this flipping. If so, can someone tell me how to open up this type of throttle to flip the magnet(s)? I can't see how to open it up.
My throttle looks exactly like this one: Scooter Throttle, Electric Scooter Throttle | Monster Scooter Parts
I'm also curious if anyone (flecc?) has any insight into why my hall effect sensor replacement efforts were such a dismal failure. I was very careful, used a very small soldering iron and surgical forceps on the leads to keep the sensor from over-heating.
Thanks in advance
& Cheers,
Roger
The throttle wires broke, so I took it apart to repair it. Whle doing so, I broke the wires off of the sensor. So, I ordered a couple replacement sensors (UGN3503U shipped from Hong Kong). They're smaller than the original, but same part number. I carefully soldered one in the manner that it apparently should've gone in; but I could not get it to work. Waving it around a magnet and moving it around in the throttle, I could barely get the output voltage to budge by 0.1 volt or so. I swapped pins 1 & 3 (+5 and output) but that didn't do much at all.Thinking that I'd perhaps burned it out by initally have 1&3 swapped, I tried my second part, with 1&3 swapped from the first go around, then when that did nothing, I swapped 1&3 yet again. So now, I probably have 1 broken sensor and 2 burned out sensors… Scooter is still not working… Laddie not happy...
SO - I decided to look for a whole new throttle. The existing throttle looks identical to several Chinese hall effect sensor throttles that are for sale on many websites (about $20USD). HOWEVER, while I was trying to get my repairs to work, I noticed that shorting the output to GND makes the motor run full throttle, while shorting the output to +5v (or leaving it disconnected) leaves the motor idle (stopped).
This is where I hope that some experienced chaps here can assist… (I'm assuming that pedelec throttles are very much like electric scooter throttles.)
Isn't this backwards? From the info that I can gleen from the web, the voltage for full throttle should normally be up at +4volts, while +1volt should be stopped. My controller is expecting the reverse of that. Low (i.e 0)volts is full throttle, while high (+5) volts is stopped. Which way is, in fact, "normal"? And is my throttle "normal"?
I believe that it was flecc that said, in another post about a broken throttle, that flipping a magnet (or two) in the throttle can change the "polarity" of the throttle. It seems that if I purchase a new throttle, I may have to do this flipping. If so, can someone tell me how to open up this type of throttle to flip the magnet(s)? I can't see how to open it up.
My throttle looks exactly like this one: Scooter Throttle, Electric Scooter Throttle | Monster Scooter Parts
I'm also curious if anyone (flecc?) has any insight into why my hall effect sensor replacement efforts were such a dismal failure. I was very careful, used a very small soldering iron and surgical forceps on the leads to keep the sensor from over-heating.
Thanks in advance
& Cheers,
Roger