Mobility scooter speed controller
How does the speed controller potentiometer control the forwards and backwards motion as well as the speed? Where can I find circuit diagrams for controllers? Most info on the web shows a wiring diagram to connect the motor / controller / battery - none on the theory behind the controller.
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Peter Skilton Wondering what you are up to? :-) Is this just a generic question about the speed controllers in general or a specific product?
由 oldturkey03 完成的
I recondition mobility scooters (at my own expense) and loan them out through my church to pensioners that cannot afford one of their own. The faults judged uneconomic to repair by professional repairers can often be fixed if time is not a factor and usually come to motor/battery/charger replacement and often making a good one out of two duff ones is a solution, except for batteries, I always replace those. The current query is for a 1990s Gofer with a controller fault. I phoned the controller Co. and they sold off the mobility side to a guy who committed suicide. They said the dead guy's one man company has folded.
I can see that the DC motor directional control is achieved by a a variable voltage from the handlebar mounted 5k variable resistor triggering either relay A or relay B but that input voltage has to be stabilised to work reliably and I don't see a stabilising circuit so maybe I am not interpreting the logic correctly. I suspect all controllers work the same way - so I look for more basic info.
由 Peter Skilton 完成的
Hi Christopher. I have two machines in at present for reconditioning. One was built in the UK and the other in China but both controller boxes have almost identical variable resistors on the handlebars so obviously work in identical manners. So my enquiry is generic. The puzzle is that they must work by varying the voltage but logic suggests that they can only reference a voltage if it is from a stabilised source - but there is no apparent stabiliser on the circuit board! Surely someone some where wrote a book or paper on mobility scooter control systems!
由 Peter Skilton 完成的
Hi,
Can anyone advise me please? I have an Ultralite 380. The battery is fully charged and the terminals seem fine. The power gets through when the key is turned on but the scooter won't move.
由 Nise 完成的
You need more info Nise to diagnose what is faulty - such as what were you doing when it died? Is the battery voltage 13.5v? How old is the battery? If you separate the motor from the battery do you have voltage at the battery side connector and continuity through the motor windings connector? Is there a power disconnect switch (so you can push the scooter) - is it broken or seized? More info Nise
由 Peter Skilton 完成的
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