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Old 01-23-2019, 05:51 AM   #1
redriddick
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Default Speed controller for golf trolley

Hi guys,
Strange one here. I have a few speed controllers off some electric golf trolleys. They are not working and usually give trouble. New ones are about 80 euro so I said I might give it a go to see about fixing em. I will upload photos later.
Any help will be much appreciated
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Old 01-23-2019, 09:10 AM   #2
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Default Re: Speed controller for golf trolley

sounds fun.
what are the motors like? single phase brushed, or 3/5phase brushless??
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Old 01-23-2019, 02:15 PM   #3
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Default Re: Speed controller for golf trolley

Hi,
They are 12v. These are walk behind trolleys.
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Old 01-23-2019, 03:03 PM   #4
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Default Re: Speed controller for golf trolley

damn, i though you meant little electric cars.
so it's a motorised bag?
golfers are lazy bastards!
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Old 01-23-2019, 05:17 PM   #5
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Default Re: Speed controller for golf trolley

They look like this.
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File Type: jpg golf caddy.jpg (125.8 KB, 14 views)
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Old 01-23-2019, 08:27 PM   #6
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Default Re: Speed controller for golf trolley

Quote:
Originally Posted by stj View Post
damn, i though you meant little electric cars.
so it's a motorised bag?
golfers are lazy bastards!
HAHAHAHA!!!! motorized bag!!! made my day!
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Old 01-23-2019, 09:25 PM   #7
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Default Re: Speed controller for golf trolley

but it is - that's the joke!
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Old 01-24-2019, 06:54 AM   #8
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Default Re: Speed controller for golf trolley

Brilliant. That's the ones above alright. Sorry to burst your bubble stj
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Old 01-24-2019, 10:14 AM   #9
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Default Re: Speed controller for golf trolley

btw, it looks like shit - i'll explain.

the center wheel is too narrow to put any weight on it on grass - it will sink down.
the outer wheels are better, but no real tread on them - ok if your pushing but not if they are driven!
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Old 01-24-2019, 02:17 PM   #10
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Default Re: Speed controller for golf trolley

They work quite well actually. If the ground is very muddy you can get spiked wheels
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Old 01-24-2019, 05:56 PM   #11
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Default Re: Speed controller for golf trolley

hardcore off-road version with diff locker... lol
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Old 01-24-2019, 06:49 PM   #12
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Default Re: Speed controller for golf trolley

https://circuitglobe.com/resistance-box.html
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Old 01-24-2019, 07:34 PM   #13
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Default Re: Speed controller for golf trolley

Can you post a picture of both sides of the controller board and the motor
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Old 01-25-2019, 01:43 PM   #14
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Default Re: Speed controller for golf trolley

Pics of one of em attached
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File Type: jpg 20190125_182340.jpg (666.8 KB, 35 views)
File Type: jpg 20190125_182330.jpg (698.5 KB, 30 views)
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Old 01-25-2019, 02:02 PM   #15
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Default Re: Speed controller for golf trolley

start by removing all the flux & shit from water ingress,
then remove and check the relay.
btw, the red & blue are touching - it should have used a connector there - cheap shit.
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Old 01-28-2019, 12:53 PM   #16
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Default Re: Speed controller for golf trolley

Here is another one, which is in better condition.
Attached Images
File Type: jpg 20190128_184911.jpg (545.9 KB, 17 views)
File Type: jpg 20190128_185002.jpg (382.2 KB, 11 views)
File Type: jpg 20190128_184940.jpg (437.6 KB, 13 views)
File Type: jpg 20190128_184927.jpg (368.6 KB, 10 views)
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Old 01-28-2019, 01:16 PM   #17
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Default Re: Speed controller for golf trolley

I'd check the two power mosfet's for shorts. The third TO-220 part seems to be a dual diode. Look for 5V at regulator U3 which powers U4 MCU, to see if the logic/MCU has power. I think the relay is part of a half H-bridge for direction?
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Old 01-28-2019, 02:29 PM   #18
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Default Re: Speed controller for golf trolley

i still suspect the relay - when mosfets short they usually explode.
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Old 01-28-2019, 02:38 PM   #19
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Default Re: Speed controller for golf trolley

Tested mosfets and I think they are ok but I really need a new multimeter.......
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Old 01-29-2019, 05:51 AM   #20
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Default Re: Speed controller for golf trolley

Will test the relay tonight .....runs to Google how to test a relay
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