New lower price for Axon II ($78) and Axon Mote ($58).
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So, I decided to purchase this motor: http://kellycontroller.com/hub-motor-48v3kw-high-torquedisc-brake-p-158.html
My question now is: Should I buy a controller or can I build my own? (Or is it even wise to build my own.)
I plan on using 2 12v Li-Ion batteries to run the motor,
and a PIK MC [...]
If I do decide to go with the controller, will any generic 3phase 48V controller work?
Talk about overkill, or did you decide to make a tractor or a dozer?
A BLDC motor controller is not a beginners project (to put it mildly) and you don't wanna be cruising at any speed when you discover your first hiccup, the second or the third
Quote from: stridera on November 05, 2012, 05:49:09 PM I plan on using 2 12v Li-Ion batteries to run the motor, Why??It's a 48V boat anchor motor and only feeding it 12V will reduce it to under a fourth of its nominal power max., if it runs at all - the weight and it's inertia won't change though, so it's a bit like putting a Lambo motor in a Lada - a lot of wasted potential
Quote from: stridera on November 05, 2012, 05:49:09 PMand a PIK MC [...]I guess you're very new to microcontrollers (and hopefully quite unaware of what PIK means in Danish ) in case you're referring to a PIC controller (from Microchip ).
Quote from: stridera on November 05, 2012, 05:49:09 PMIf I do decide to go with the controller, will any generic 3phase 48V controller work?Yes, if it's a 3kW controller and you feed it 48V.
If you have the option to return the motor for a full refund, do so.Then have the patience to read up on what you need - your project is absolutely not a beginners project, which means that if you just dive in because of impatience, you're destined to fail - even a trained engineer will plan a lot before attempting such a project (and some of them will fail ever the same, but will hopefully have the experience and knowledge to rise again).So read, read and read 'till you puke and make good guestimates of total loaded weight, needed acceleration to balance etc. - then you may have a fighting chance
I just wanted high enough torque to handle the reverse pendulum balancing.
[...] I'm more fluent with the code than I am with the hardware. This project, ambitious as it is, is to teach me some of joys of mechanical and hardware/circuit design.
And, if I finish this, it'll really help my e-pik. (Yes, I just looked that up.)
[...] there seems to be a lack of expertise in the field and not enough literature on the network for a project like mine.)
Money isn't much of an issue for me, so I figure I would try it with this and then get a newer motor if I need to. (Unless, of course, I am given some real answers w/o being told to go to school for a mecheng degree.
Simple proof, try balancing a plain stick [...]
Hi,Quote from: newInRobotics on November 08, 2012, 02:20:25 AMSimple proof, try balancing a plain stick [...]Try with a hammer - fast way to get the idea
Quote from: Soeren on November 10, 2012, 05:39:51 AMHi,Quote from: newInRobotics on November 08, 2012, 02:20:25 AMSimple proof, try balancing a plain stick [...]Try with a hammer - fast way to get the idea Hammer is a stick with weight on one end :p
Doesn't really matter, since it's a hub motor attached to the wheel. All the weight will be above it no matter what I choose.
I meant that the weight will always be above. I agree it's easier to balance that way, but I can't put my motor above the weight unless my bot is upside down.