Buggies Gone Wild Golf Cart Forum - View Single Post

cgtech · 08-12-2020, 12:28 AM

Lest start off with this, A BIG DEAL. A Alltrax SR controller cannot power a RXV "3-phase AC motor", no matter how hard you try. This is a deal killer if thats what your thinking. (Just 2 different methods of powering a motor, not compatible).

Now, if you are just looking for "throttle compatibility info", it gets much easier. The RXV uses a "non contact potentiometer", just like a Yamaha Drive. It's just a "hall effect sensor" that uses a 0-5v signal. (Its about 0.47v at rest, and about 4.7v at full throttle). The reason for that voltage range discrepancy is just so the controller knows it is actually "hooked to a real sensor", and not just a unplugged connector "hanging out in the breeze", hooked to nothing at all.

Some DC motors & "single phase" ac motors can sometimes play nice amongst "the currents", but 3-phase motors never ever will be happy on a DC motor controller. A common question I'm asked is "just how the 'eff' can you get AC power from a DC battery pack?" Well, it's simple if you say it fast. The controller takes DC power (simple "+" & "-"), and turns "+" & "-" on & off very rapidly, 12,000 times a second is the order we are talking about. Think like this, +,-,+,-,+,-,+,-,+,-+,-,+ Thousands of times a second. (Pretty wild, right?)

Maybe you now get how a SR controller (delivering just "B+") would at best just lock a AC motor in "just wont move at all" situation, and make a ton of heat while doing so.

Wanna know more? I'll be glad to help, within reason, of course.

I built Yamaha (sepex DC motor) upgrades for "Drive electrics" before the aftermarket had their stuff ready. (And their response was "we cant talk to you anymore about what your doing"). Of course, it wasnt perfect, occasional LM7805 & throttle sensor failures did happen from time to time, but I was able to offer a upgrade path while the world waited for the Alltrax XCT release (which was only about 5 years delayed). Local engineers & Alltrax alike said "theres no way that works", but, hey, whatever meets the customer need & gets units out the door.....

LOL, was a hero for a moment!

08-12-2020, 12:28 AM	#2
cgtech Over This Interview Is... Join Date: Jun 2012 Location: AZ Posts: 17,449	Re: RXV Throttle on Alltrax SR48500 Lest start off with this, A BIG DEAL. A Alltrax SR controller cannot power a RXV "3-phase AC motor", no matter how hard you try. This is a deal killer if thats what your thinking. (Just 2 different methods of powering a motor, not compatible). Now, if you are just looking for "throttle compatibility info", it gets much easier. The RXV uses a "non contact potentiometer", just like a Yamaha Drive. It's just a "hall effect sensor" that uses a 0-5v signal. (Its about 0.47v at rest, and about 4.7v at full throttle). The reason for that voltage range discrepancy is just so the controller knows it is actually "hooked to a real sensor", and not just a unplugged connector "hanging out in the breeze", hooked to nothing at all. Some DC motors & "single phase" ac motors can sometimes play nice amongst "the currents", but 3-phase motors never ever will be happy on a DC motor controller. A common question I'm asked is "just how the 'eff' can you get AC power from a DC battery pack?" Well, it's simple if you say it fast. The controller takes DC power (simple "+" & "-"), and turns "+" & "-" on & off very rapidly, 12,000 times a second is the order we are talking about. Think like this, +,-,+,-,+,-,+,-,+,-+,-,+ Thousands of times a second. (Pretty wild, right?) Maybe you now get how a SR controller (delivering just "B+") would at best just lock a AC motor in "just wont move at all" situation, and make a ton of heat while doing so. Wanna know more? I'll be glad to help, within reason, of course. I built Yamaha (sepex DC motor) upgrades for "Drive electrics" before the aftermarket had their stuff ready. (And their response was "we cant talk to you anymore about what your doing"). Of course, it wasnt perfect, occasional LM7805 & throttle sensor failures did happen from time to time, but I was able to offer a upgrade path while the world waited for the Alltrax XCT release (which was only about 5 years delayed). Local engineers & Alltrax alike said "theres no way that works", but, hey, whatever meets the customer need & gets units out the door..... LOL, was a hero for a moment!