Thanks for the quick reply.
The problem I'm facing is lack of experience and confidence. Your description made it sound potentially more complicated, in ways that I am not familiar with. If you tell me electric motor, with an extra axle in between to gear it down... I understand how all that works and why I'm doing it. With this wheelchair one, I guess it's as you say:
I have a rough idea what brushed means, but not why it impacts which controller I need. I don't have any idea what PM means or how big of a problem it would be. If it requires a different controller, I don't know how it needs to be different, or how easy to acquire the necessary controller would be.
Not that I don't believe you, but I'm having a hard time figuring out how you came up with 75amps. I cant seem to find any details on the thing except for "24v".
I suppose to sum up, my plan had been to find an appropriate motor, controller, and battery set up, run it by you guys to make sure it all checks out, and then buy it all at once. That way I have reason to believe its going to work, without unexpected changes in purchase plan, and total price.
That being said, you don't seem overly concerned about the potential hurdles, so I guess they typically aren't too hard to overcome.
Am I correct in saying the controller you linked doesn't seem to do regenerative braking?
Thanks again for your help.
Well, it's never as easy as we want it to be (but
close most of the times
)
but it's also never as difficult as we're afraid it could turn out to be either
Motors are same same just different,
PM means permanent magnet (literally just Magnets inside) as opposed to
"serial wound" (which is a stator coil to induce the magnetic field when power is applied, just as the coil on the rotor.. just 'not moving')
The controller for that is the same in nearly all cases
It's not for brushed and brushless motors though!
I'll skip the brushless details (since that's an unlikely scenario here anyways)
let's just say it has one more powerlead (at least) that needs to be taken care of
Now.. no.. the controller I linked you to has no regenerative braking capabilities..
this one has:
http://kellycontroller.com/pm36101100a24-36vwith-regen-p-542.html
(notice the price difference
)
the 75Amps are taken of some other forum where they talked about a similar (or rather identical) transaxle and someone went ahead and measured the currentflow...
No, I cannot find any specsheets either (likely because it's heavily relabeled by the MobScooterMfg
)
But since it IS a mobility scooters transaxle I know it's intended to haul human bodies around..
so it should have enough power in any case
And you are right, I am not overly concerned of course.
First it's not my money you are going to spend, so I'm not risking much...
but most importantly, because I have seen so many electric motors, controllers and batteries by now, that I don't get too nervous when I see a new one.
Especially mobility scooter transaxles are 'easy' since the absolute worst thing that could happen is, that you need to find the original controller
(which might take a week longer maybe cost 20 bucks more but is very well possible
)
Personally, I'd rather go step by step, since as it turned out, it's hard to find everything that's needed in one shop anyways, and if you need to shop around
(and cannot save shipping fees for that matter) why take chances?
get a part, see what it needs to work properly and make your decisions based on that newly gained knowledge.
(personal taste.. not advice
)
But let's get back to the motor transaxle in question as an example:
Maybe the guy in the other forum was indeed wrong.
With the motor in my hands I can tell you it's current draw
(a voltage divider is quickly made, internal resistance thus quickly measured and current draw easily calculated)
No more doubts.. since the controller should be "oversized" by a decent amount anyways
I'd live with any measuring error and so would the motor and controller.
it cannot be too big, and "too small" can be prevented rather easily
'sid
