Speed controller for golf trolley

[redriddick]

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

[stj]

Re: Speed controller for golf trolley

sounds fun.
what are the motors like? single phase brushed, or 3/5phase brushless??

[redriddick]

Re: Speed controller for golf trolley

Hi,
They are 12v. These are walk behind trolleys.

[stj]

Re: Speed controller for golf trolley

damn, i though you meant little electric cars.
so it's a motorised bag?
golfers are lazy bastards!

[redwire]

Re: Speed controller for golf trolley

They look like this.

[CapLeaker]

Re: Speed controller for golf trolley

damn, i though you meant little electric cars.
so it's a motorised bag?
golfers are lazy bastards!

HAHAHAHA!!!! motorized bag!!! made my day!

[stj]

Re: Speed controller for golf trolley

but it is - that's the joke!

[redriddick]

Re: Speed controller for golf trolley

Brilliant. That's the ones above alright. Sorry to burst your bubble stj

[stj]

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!

[redriddick]

Re: Speed controller for golf trolley

They work quite well actually. If the ground is very muddy you can get spiked wheels

[CapLeaker]

Re: Speed controller for golf trolley

hardcore off-road version with diff locker... lol

[petehall347]

Re: Speed controller for golf trolley

https://circuitglobe.com/resistance-box.html

[sam_sam_sam]

Re: Speed controller for golf trolley

Can you post a picture of both sides of the controller board and the motor

[redriddick]

Re: Speed controller for golf trolley

Pics of one of em attached

[stj]

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.

[redriddick]

Re: Speed controller for golf trolley

Here is another one, which is in better condition.

[redwire]

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?

[stj]

Re: Speed controller for golf trolley

i still suspect the relay - when mosfets short they usually explode.

[redriddick]

Re: Speed controller for golf trolley

Tested mosfets and I think they are ok but I really need a new multimeter.......

[redriddick]

Re: Speed controller for golf trolley

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