lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Modified Golf Carts > Extreme DC!
Extreme DC! Extreme Electric Golf Carts!



Post New Thread  Reply
Thread Tools Display Modes
Unread 06-09-2014, 07:24 PM   #11
Getting Wild
 
kb1sxv's Avatar
E-Z-GO
 
Join Date: Sep 2011
Location: watertown ct
Posts: 103
Default Re: field shorting

Well I just dont use it on hills, And mostly just to get up to speed quick, and turn it off. I think using sense with this mod and it will be fine. It's not your average mod, so who does average mods? any hands
kb1sxv is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Unread 06-09-2014, 07:59 PM   #12
Let's go racin' boyz!!
 
TerryH's Avatar
E-Z-GO
 
Join Date: Oct 2010
Location: Springdale, AR
Posts: 4,155
Default Re: field shorting

Quote:
Originally Posted by kb1sxv View Post
Well I just dont use it on hills, And mostly just to get up to speed quick, and turn it off. I think using sense with this mod and it will be fine. It's not your average mod, so who does average mods? any hands
"raises hand" Average mods are all I ever do.
TerryH is offline   Reply With Quote
Unread 06-17-2014, 04:12 PM   #13
Getting Wild
 
kb1sxv's Avatar
E-Z-GO
 
Join Date: Sep 2011
Location: watertown ct
Posts: 103
Default Re: field shorting

I'm surprised that nobody else with a ezgo series motor cart hasn't tried it out yet. Maybe my controller is special, #licks window
kb1sxv is offline   Reply With Quote
Unread 06-17-2014, 04:21 PM   #14
Getting Wild
 
kb1sxv's Avatar
E-Z-GO
 
Join Date: Sep 2011
Location: watertown ct
Posts: 103
Default Re: field shorting

I'm surprised that nobody else with a ezgo series motor cart hasn't tried it out yet. Maybe my controller is special,
kb1sxv is offline   Reply With Quote
Unread 06-20-2014, 03:36 AM   #15
Not Yet Wild
 
Join Date: Sep 2013
Posts: 10
Default Re: field shorting

Quote:
Originally Posted by TDAWG View Post
What you are describing has been done for years on all different types of electric motors. There used to be kits for golf carts for sale on e-bay to do this. It is a use at your own risk type deal, just like a controller by-pass is. Using both systems at the same time is really pushing the envelope of destruction but you are right, it does work. This has also been the cause of some controversy in the golf cart drag racing world. People that have seen this being used did not understand what they were looking at. They then assumed it was a device to switch voltage and the rumors got started. I would not use one myself. Be careful with it
Field shorting is heat abuse to a good motor. If your going to do this then the best time is after your motor has reached full power. Field shorting is just one of a few ways to get extra power from a stock motor. Controller by-pass. Adding more voltage. Parallel battery packs. The forums are full of this kind of information. Some good & not so good. But a shunt is no comparison to switching voltage. I believe one the controversy in the golf cart drag racing world was parallel battery packs. Or what some people could do with them. I guess it really comes down to ones intentions.
Gear Head is offline   Reply With Quote
Unread 07-13-2014, 09:28 PM   #16
Not Yet Wild
E-Z-GO
 
Join Date: Jul 2014
Location: Northeast Pa
Posts: 9
Default Re: field shorting

In forklifts we call it Field Weakening. we use a 1 ohm high watt resistor across the field coils after the drive motor has hit high speed. This does not harm the motor in any way. This calms down the magnetic field of the field coils allowing higher speed as the magnetic fields of the armature and fields are not fighting each other at high speed. Kills torque but allows higher motor speed. I want to try this to my 36v EZ GO. Usually, the field weakening contactor is controlled by the motor controller. I was thinking of robbing an old EV-100 panel with field weakening and regenerative braking. would also love to try a dual motor setup, lol. The AC forklifts are a little too new to remove motors and controllers from scrap units, maybe I'll get lucky!
Mighty Mouse is offline   Reply With Quote
Unread 07-14-2014, 05:00 AM   #17
Getting Wild
 
kb1sxv's Avatar
E-Z-GO
 
Join Date: Sep 2011
Location: watertown ct
Posts: 103
Default Re: field shorting

Yah I scrapped A few ac trucks. There was a fork truck with that resistor and a contactor for the field weakening. I used micro switches and stuff like that :) Ev 100 contacts . yah dual motor setup would be neat but 4 wheel drive would be neat too with the ev 100 . pull apart a 3 wheel truck . finding a 3 phase ac motor to fit my ezgo has been tough . I gave up on that. The field weakening makes my cart like turbo up to 25 mph or faster, Its nice. But something will have to give speeding it up all the time :)
kb1sxv is offline   Reply With Quote
Unread 07-15-2014, 12:05 PM   #18
Gone Wild
 
UroGator's Avatar
E-Z-GO
 
Join Date: Jan 2014
Location: FL
Posts: 280
Default Re: field shorting

Quote:
Originally Posted by Mighty Mouse View Post
In forklifts we call it Field Weakening. we use a 1 ohm high watt resistor across the field coils after the drive motor has hit high speed. This does not harm the motor in any way. This calms down the magnetic field of the field coils allowing higher speed as the magnetic fields of the armature and fields are not fighting each other at high speed. Kills torque but allows higher motor speed. I want to try this to my 36v EZ GO. Usually, the field weakening contactor is controlled by the motor controller. I was thinking of robbing an old EV-100 panel with field weakening and regenerative braking. would also love to try a dual motor setup, lol. The AC forklifts are a little too new to remove motors and controllers from scrap units, maybe I'll get lucky!
I believe that this is same thing the TURBO function on an Alltrax controller achieves. It weakens the field at 100 percent throttle to allow higher top speed.
UroGator is offline   Reply With Quote
Unread 07-15-2014, 03:22 PM   #19
Getting Wild
 
kb1sxv's Avatar
E-Z-GO
 
Join Date: Sep 2011
Location: watertown ct
Posts: 103
Default Re: field shorting

Quote:
Originally Posted by UroGator View Post
I believe that this is same thing the TURBO function on an Alltrax controller achieves. It weakens the field at 100 percent throttle to allow higher top speed.
I'm doing this with a series wound motor. I haven't any clue about an altrax controller. The sepex controllers we use have field weakening , timing adjustments, ext . All kind of stuff to do with the handheld controller. adjusments out the wazoo! LOL My old curtis controller thinks it's plugging when i short the fields. It is a neat trick. The ge controllers have all that neat stuff too. I'd like to find a ac motor that would fit in my cart, I can get my hands on lift truck ac traction controllers. I think that is the next project. An Ac drive system .
kb1sxv is offline   Reply With Quote
Unread 10-16-2018, 01:21 PM   #20
Not Yet Wild
 
Join Date: Apr 2011
Location: Goodyear, AZ
Posts: 15
Default Re: field shorting

I am surprised how little information is available on this mod. Series motors have full current flow through the field and then through the armature, hence the name series motor. The current flow generates a magnetic field that drives the motor: however, as the motor rotates another magnetic field is generated in the motor called the back electro magnetic field or back EMF. This back EMF eventually counters the forward flow of current in the field which limits current to the armature which limits power and prevents the motor from running away or over-speeding.

If you place a solenoid to short across the two field terminals The back EMF can no longer limit the current to the armature and the motor will turn faster. Even though no current is flowing through the field the residual magnetism in the core of the field windings is still sufficient excitation for the armature. For a golf cart the motor controller will still limit motor power so the cart will accelerate until the controller power equals the power required to drive the cart. In my case I turned a 12 MPH cart into a 22 MPH cart. The risk is if you are in hilly country and going down hill the cart could over-speed and bad things can happen. I live in a flat community so that cannot happen.

I have used both a 36V and 12V solenoids to short the field. The 12V solenoids are cheaper and easier to find. I put a micro switch on the accelerator linkage to trip at the last 10% of pedal travel. I used battery sized cables since lighter wires do not work as well.

The back EMF in a series motor is more complicated and this simplified discussion should help explain what is happening.
chadwce is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Modified Golf Carts > Extreme DC!


Thread Tools
Display Modes


Similar Threads
Thread Forum
Wiring for lights shorting and melting Gas Club Car
97 Club car wont go after shorting A1 with B- Electric Club Car
Micro switch shorting out Electric EZGO
Micro switch shorting out Test Post


All times are GMT -5. The time now is 02:09 PM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.