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Old 08-11-2020, 07:55 PM   #1
radelon
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Default RXV Throttle on Alltrax SR48500

Can this work? If so what would the settings be in the app.

Thanks in advance.

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Old 08-12-2020, 12:28 AM   #2
cgtech
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Default 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!
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Old 08-12-2020, 12:18 PM   #3
georgia088
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Default Re: RXV Throttle on Alltrax SR48500

Quote:
Originally Posted by cgtech View Post
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.
Very interesting!! This may be a little off topic, but what are the advantages of using the ac motor?
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Old 08-12-2020, 02:28 PM   #4
cgtech
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Default Re: RXV Throttle on Alltrax SR48500

More efficient, more range per charge. 3-phase motors in carts can be tuned to be very powerful. You arent nearly as "speed limited" as you are with a DC motor (rxv motors can handle rpms that would destroy typical dc brushed motors quickly). No brushes to wear out on AC motors. Much more effective at using "regen braking" to put energy back into the batteries when your slowing down.

The list of advantages is pretty significant.
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Old 08-12-2020, 03:17 PM   #5
kernal
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Default Re: RXV Throttle on Alltrax SR48500

Things that are obsolete already or becoming obsolete: "series" drive carts, 36v carts, DC motored carts. Several EZGO models are 72v(AC).
According to Yamaha web site, all electric carts are AC. No more DC models. Club Car like EZGO is offering lithium batteries and more and more AC models.

The other thing that's becoming obsolete is reasonable prices!!
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Old 08-12-2020, 07:21 PM   #6
georgia088
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Default Re: RXV Throttle on Alltrax SR48500

And from what I am reading, most “upgrades” to the ac carts are software updates. Not things that “shade tree” and diy mechanics can add to your cart.
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