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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV.



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Old 09-06-2016, 04:03 AM   #1
INWO
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Default Speed magnet

Looking for beta tester to test in carts that can't use high speed magnet.
Does RXV use a standard tach connection?

How do they limit speed if not from tach? Are they just keeping field current high?

A MM "MMLIMIT" in beta testing sends stock pulses to controller. Good for cars with speedometer, like Gems. Speedometer is correct to programmed speed.

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Old 09-06-2016, 06:48 AM   #2
BobBoyce
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Default Re: Speed magnet

Quote:
Originally Posted by INWO View Post
Looking for beta tester to test in carts that can't use high speed magnet.
Does RXV use a standard tach connection?

How do they limit speed if not from tach? Are they just keeping field current high?

A MM "MMLIMIT" in beta testing sends stock pulses to controller. Good for cars with speedometer, like Gems. Speedometer is correct to programmed speed.

Deposit and return required.
The RXV motor is 3 phase AC drive with a motor speed encoder that reports motor RPM. Speed is calculated by using an RPM to MPH calculation. In a stock RXV with stock gears and tires, it is 331 RPM per MPH. Someone can just read that motor sensor output and use a programmable divider to read the vehicle speed for an aftermarket speedometer.

Bob
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Old 09-06-2016, 09:15 AM   #3
INWO
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Default Re: Speed magnet

Thank you, looks a lot like sensors used in forklift and other industrial equipment.
Short of buying a cart, won't be going far on that one.
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Old 09-06-2016, 09:59 AM   #4
BobBoyce
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Default Re: Speed magnet

Quote:
Originally Posted by INWO View Post
Thank you, looks a lot like sensors used in forklift and other industrial equipment.
Short of buying a cart, won't be going far on that one.
What is it that you're wanting to do? If you're wanting to produce an aftermarket speedometer, there would likely be interest. Most electric motors used in carts and electric vehicles have a speed sensor signal that could be sensed. As long as you have a programmable divider with enough range, it could be calibrated to read correctly, no matter what changes have been made to gearing or tire sizes.

Bob
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Old 09-06-2016, 01:30 PM   #5
mjroman20
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Default Re: Speed magnet

The RXV uses a 64count AB encoder. I read something of an experiment someone tried a while back where they machined out every other tooth of the encoder gear (effectively making it a 32count)

I believe their result was a non-running cart. AC systems are picky about their position encoders and modifying them typically ends poorly.
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Old 09-06-2016, 02:15 PM   #6
cgtech
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Default Re: Speed magnet

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Originally Posted by mjroman20 View Post
The RXV uses a 64count AB encoder. I read something of an experiment someone tried a while back where they machined out every other tooth of the encoder gear (effectively making it a 32count)

I believe their result was a non-running cart. AC systems are picky about their position encoders and modifying them typically ends poorly.
Yep, that was me & nope it didnt work. Controller knew it was BS & went into "2mph mode".
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Old 09-06-2016, 02:23 PM   #7
mjroman20
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Default Re: Speed magnet

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Originally Posted by cgtech View Post
Yep, that was me & nope it didnt work. Controller knew it was BS & went into "2mph mode".
Must be some check of the pulses vs the drive current frequency, but I really don't know enough about the finer points of ac motor drives to say for sure...or maybe the spacing of the sensors, the inputs should be a particular degree off...so I guess if you shave off every other tooth you would also need to move one of the sensor channels to compensate.
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Old 09-06-2016, 05:04 PM   #8
INWO
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Default Re: Speed magnet

Quote:
Originally Posted by BobBoyce View Post
What is it that you're wanting to do? If you're wanting to produce an aftermarket speedometer, there would likely be interest. Most electric motors used in carts and electric vehicles have a speed sensor signal that could be sensed. As long as you have a programmable divider with enough range, it could be calibrated to read correctly, no matter what changes have been made to gearing or tire sizes.

Bob
I do make a universal adjustable analog speedometer. It can be set to use as tach or speedometer. Or anything in between. Only use it on standard hall sensors though.

Actually I was wondering if electronic manipulation of encoder pulses would allow more speed.

In lieu of buying a cart, maybe just an encoder assembly would be enough.

It must use 4 wires then. B+, B-, A, and B.
Think I can work with that.

The mechanical method should work. Try it again, making a wheel with less teeth, but keeping duty cycle the same.

Is duty cycle 50% stock? ie. tooth and space equal.

Also looking for someone with a sepex cart that does not respond to 1/2 pulse magnet. See if a 7/8 or 3/4 pulse magnet works.
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Old 09-06-2016, 05:12 PM   #9
INWO
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Default Re: Speed magnet

Is this the most common?
Early models use bearing encoder?
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Old 09-06-2016, 05:54 PM   #10
INWO
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Default Re: Speed magnet

Quote:
Originally Posted by cgtech View Post
Yep, that was me & nope it didnt work. Controller knew it was BS & went into "2mph mode".
Would you send me the old wheel?
Were did you find a new one?
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