Mobility scooter

[fletch]

Hi all new here so not sure where to post but here we go,

I built my own mobility scooter it has a three phase 1500w motor and an controller but am not sure on the wiring I've got the scooter moving and all's ok but want to have electric brake but the wiring diagram I have is not right the cruse wiring reverses the motor any help welcome,

 

[amberwolf]

If experimentation has not found the correct wires to engage the brake, then there may not be an actual braking function. Some controllers only stop providing further forward motion when brake is engaged, rather than actually stopping forward motion.

Some of those can be reprogrammed, or can have a jumper installed between a pair of pads inside (labelling may vary) on the board, to enable actual braking function.

How effective that function is when enabled also varies. Some controllers actively brake the motor by reversing power on it, like the ones on my SB Cruiser trike. This can be effective down to practically zero speed.

Some only suck power from the motor, which is only really effective at higher motor speeds; as it slows down less power is made so less braking happens.


If you have to, you can open up the controller and post good-quality closeup pics of both sides of the board inside, so that we can try to see if any of the markings on it are like those of other controllers already posted around the forums. Keep in mind that when opening stuff up there is always a risk of problems or failure.

 

[fletch]

Many thanks for the valued information, firs are the pictures showing as they are on one computer but not the other,

The wires do you just join them together?

surely all these spear wires must do something? any ideas

Plus I've read somewhere the motor stops when the battery voltage drops below a certain voltage so its about 52 volt so any idea what voltage is the cut off voltage.

Not confident in stripping down the controller yet!

 

[SlowCo]

Very nice build!

Although it looks like your center of gravity is very much to the rear with the seat and batteries placed so far back and up. Shifting the seat 10 to 20 cm (4 - 8 inches) forward might make it less prone to wheelie. Unless that's the idea. :lol:
But it might be the camera angle that makes it look that way.

Can you tell us more about what motor (chain driven?), controller and performance you have? And I would love to see more photo's. Good luck with the wiring. I can't help as I'm a n00b at that

 

[markz]

The controller has a Low Voltage Cutoff or LVC, it cuts the battery power once it reaches below a certain amount.
That is the controller specs, so you need that info.

 

[fletch]

Very nice build!

Although it looks like your center of gravity is very much to the rear with the seat and batteries placed so far back and up. Shifting the seat 10 to 20 cm (4 - 8 inches) forward might make it less prone to wheelie. Unless that's the idea. :lol:
But it might be the camera angle that makes it look that way.

Can you tell us more about what motor (chain driven?), controller and performance you have? And I would love to see more photo's. Good luck with the wiring. I can't help as I'm a n00b at that

The motor is the same as this one its brushless 3 phase 1500W plus the drive train which is slightly different now just a change in sprockets
The performance is good it only goes 10mph but the legal limit is 8mph it will be altered at some stage thinking of an two speed gearbox it accelerates good and yes it can pull wheelies

View attachment 1

 

[Drunkskunk]

Very cool looking scooter.

Different controllers will have different braking styles. generally they fall into one of three categories.
Ebrakes - a brake cut-off that disables the motor when the brake lever is pulled
Regen braking - programming that allows the motor to act as a generator during braking, giving a good but diminishing braking effect as you slow down.
E-ABS braking - Really just a fancy name for regen braking, capitalizing on the fact that regen braking can't lock up the motor, so it is an anti-lock braking system. It can be different from true regen in that it might not put the power back into the3 battery, but instead just dump it as heat.

None of these systems will lock up or skid a wheel, and they give next to no braking at low speed. you couldn't hold on a hill with this kind of braking.

That kind of braking is possible with the motor, but I know of no controller for ebikes or scooters that is capable of it. It works by sensing the motor's rotation, then dumping enough current into it to hold it in a stall condition. That kind of braking would generate a huge amount of heat and waste a lot of power when working at low rpm. A simple mechanical brake would be several orders of magnitude better.

 

[SlowCo]

8)
Some very nice details and handiwork. Thanks for sharing the photo's and info. I hope you'll update this thread when you have done some miles with it.

 

[fletch]

Thanks guys when trying the different opinions one did disconnect the drive to the motor but in the reading of the possible configurations it says regenerative braking, this was from eBay so who knows?