EZGO models explained

idocmiller · 02-08-2021, 11:18 PM

Great info! I obviously need to continue learning before I lock my decision of RXV over TXT.

ojo · 02-09-2021, 08:47 AM

Found at electrical engineering portal:

"Countercurrent braking – The principle
The motor is isolated from the mains power while it is still running and then reconnected to it the other way round. This is a very efficient braking system with a torque, usually higher than the starting torque, which must be stopped early enough to prevent the motor starting in the opposite direction."

"Compared to mechanical and hydraulic braking systems, it has the advantage of steadiness and does not require any wear parts."

And with own words, when braking, the motor acts as a generator and the produced current are floating back to the batteries (regen).

ACHiPo · 02-09-2021, 10:04 AM

Quote:

Originally Posted by ojo

Found at electrical engineering portal:

"Countercurrent braking – The principle
The motor is isolated from the mains power while it is still running and then reconnected to it the other way round. This is a very efficient braking system with a torque, usually higher than the starting torque, which must be stopped early enough to prevent the motor starting in the opposite direction."

"Compared to mechanical and hydraulic braking systems, it has the advantage of steadiness and does not require any wear parts."

And with own words, when braking, the motor acts as a generator and the produced current are floating back to the batteries (regen).

What happens if the batteries are full?

kernal · 02-09-2021, 10:15 AM

RXV has a bleed off resister for this issue. Normally not an issue.

But your question is valid. There has been an issue with this as reported on this forum in the past. The scenario: An owner lived in a situation where the beginning of every trip from the carts' charger location was at the top of a very long hill. Basically the long duration of high regen from "right off the charger" overwhelmed the bleed off system and the controller shut the cart down.
I don't remember the details and it might have been a factory lithium cart which is significantly different than the FLA models because of the built in BMS.

There are hundreds of RXVs in my area and this isn't a problem far as I know.

ACHiPo · 02-09-2021, 10:18 AM

Quote:

Originally Posted by kernal

RXV has a bleed off resister for this issue. Normally not an issue.

But your question is valid. There has been an issue with this as reported on this forum in the past. The scenario: An owner lived in a situation where the beginning of every trip from the carts' charger location was at the top of a very long hill. Basically the long duration of high regen from "right off the charger" overwhelmed the bleed off system and the controller shut the cart down.
I don't remember the details and it might have been a factory lithium cart which is significantly different than the FLA models because of the built in BMS.

That makes sense. Of course it would also make sense to program the charger to only charge to 90% as recommended by Tesla unless you are going on a long drive and need the extra range.

kernal · 02-09-2021, 10:23 AM

Quote:

Originally Posted by ACHiPo

That makes sense. Of course it would also make sense to program the charger to only charge to 90% as recommended by Tesla unless you are going on a long drive and need the extra range.

IMO you are giving the golf cart companies way to much credit. In my experience they (all of them) are not engineered any where close to automobiles. RXVs have sloppy front suspension. Too expensive for Textron to engineer and source proper parts. Example of this are on this board. CC and Yamaha have issues like this also.

meimk · 02-09-2021, 10:28 AM

Full is kind of a squishy term in batteries. A 48 volt pack is considered full at around 51 volts, but that an vary slightly depending on the manufacturer. Meanwhile during charging the voltage can rise to mid 60's. Even if the voltage rises momentarily from a hard stop, that "excess" will get used as soon as you accelerate. To protect the system there is a resistor coil in case of extreme over voltage and protective resistor to limit the voltage that makes it to the controller.

kernal · 02-09-2021, 11:00 AM

Here is the thread I referenced in post#14 if you are interested.

https://www.buggiesgonewild.com/showthread.php?t=132425

ACHiPo · 02-09-2021, 11:35 AM

Quote:

Originally Posted by kernal

Here is the thread I referenced in post#14 if you are interested.

https://www.buggiesgonewild.com/showthread.php?t=132425

Good explanation. Thanks.

02-08-2021, 11:18 PM	#11
idocmiller Not Yet Wild Join Date: Feb 2021 Location: Indianapolis, IN Posts: 12	Re: EZGO models explained Great info! I obviously need to continue learning before I lock my decision of RXV over TXT.

02-09-2021, 08:47 AM	#12
ojo Gone Wild Join Date: Sep 2020 Location: Germany Posts: 2,000	Re: EZGO models explained Found at electrical engineering portal: "Countercurrent braking – The principle The motor is isolated from the mains power while it is still running and then reconnected to it the other way round. This is a very efficient braking system with a torque, usually higher than the starting torque, which must be stopped early enough to prevent the motor starting in the opposite direction." "Compared to mechanical and hydraulic braking systems, it has the advantage of steadiness and does not require any wear parts." And with own words, when braking, the motor acts as a generator and the produced current are floating back to the batteries (regen).

02-09-2021, 10:28 AM	#17
meimk Gone Wild Join Date: Jun 2011 Location: Northern Indiana Posts: 2,827	Re: EZGO models explained Full is kind of a squishy term in batteries. A 48 volt pack is considered full at around 51 volts, but that an vary slightly depending on the manufacturer. Meanwhile during charging the voltage can rise to mid 60's. Even if the voltage rises momentarily from a hard stop, that "excess" will get used as soon as you accelerate. To protect the system there is a resistor coil in case of extreme over voltage and protective resistor to limit the voltage that makes it to the controller.

02-09-2021, 11:00 AM	#18
kernal Gone Wild Join Date: Jul 2010 Location: Peachtree City, Ga. Posts: 2,759	Re: EZGO models explained Here is the thread I referenced in post#14 if you are interested. https://www.buggiesgonewild.com/showthread.php?t=132425

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02-09-2021, 10:15 AM	#14
kernal Gone Wild Join Date: Jul 2010 Location: Peachtree City, Ga. Posts: 2,759	Re: EZGO models explained RXV has a bleed off resister for this issue. Normally not an issue. But your question is valid. There has been an issue with this as reported on this forum in the past. The scenario: An owner lived in a situation where the beginning of every trip from the carts' charger location was at the top of a very long hill. Basically the long duration of high regen from "right off the charger" overwhelmed the bleed off system and the controller shut the cart down. I don't remember the details and it might have been a factory lithium cart which is significantly different than the FLA models because of the built in BMS. There are hundreds of RXVs in my area and this isn't a problem far as I know.