Yes; that's almost certainly who he is referring to. Rarely posts.Lebowski said:Is there a member named 'Accountant'
Yes; that's almost certainly who he is referring to. Rarely posts.Lebowski said:Is there a member named 'Accountant'
PM sent! I gave you three options one of which allows you to borrow my motors, controllers, and power supplies as long as you wish, really, for 2012. You can actually install the motors & use them under load too. Just give the parts back to my cousin in Switzerland before next Christmas by early December or send back by post whenever you want to in 2012. That may be a hassle for you though, so consider this too...Lebowski said:If you want to try it out, PM me
Lebowski said:markobetti said:Accountant is also offering to send you xie chang board to implement your chip inside ... Small help from Croatia.... with greetings from Tesla
If thats possible, you have the market for buying your chip ...
Is there a member named 'Accountant' or is the accountant of your company ? Tesla ?
Accountant said:Lebowski said:markobetti said:Accountant is also offering to send you xie chang board to implement your chip inside ... Small help from Croatia.... with greetings from Tesla
If thats possible, you have the market for buying your chip ...
Is there a member named 'Accountant' or is the accountant of your company ? Tesla ?
At your level of understanding will this be able to be accomplished within the next few months orLebowski said:That is what I use currently, though the multiplication factor is fixed and I use my lab supply.parabellum said:Lebowski, how is your throttle working in given case? Changing multiplication factor to BEMF and then chip modifies PWM accordingly?
I want to go to (motor phase) current control though as close control / monitoring of the currents will prevent the killing of FET's and will make the system more user friendly (torque is proportional to current).
Excellent Brilliant. 8)Lebowski said:just added an option: now there is a choice between sensored and sensorless.
Believe me, ES members are impatiently waiting to get hands on this one. :wink:deVries said:ES members really need to take notice of this thread AND START TESTING this with other motors ASAP.Lebowski said:just added an option: now there is a choice between sensored and sensorless.
Lebowski, wayyy better than the movie.
What inductance? 97khz? how warm do your fets and fet drivers get? You should put a load on it. Maybe put some heat sinks on the fets first.Lebowski said:Since I can now do sensorless I modified a small RC motor I have
lying around. It's seen some abuse (notice the wiggle in the rotor)
It's a Scorpion 4025 with the factory windings removed.
(4025 = 40 mm diameter, 25 mm magnet length). It was much harder
to start sensorless (needs messing with the parameters) and took several
attempts but I got it going. My bicycle motor starts very very easy but
after watching the video I think you'll agree this RC motor is a bit
too extreme I did this test just to indicate the capabilities of my
controller.
The video shows the motor running, first fast, then very slow. After that
it shows the (low inductance) stator windings and the output stage.
33 V supply, 97 kHz PWM, 40kHz loop frequency, current controlled.
[youtube]M3BceopKBts[/youtube]
deVries said:Wouldn't it have been much easier to start with more poles wound? 20 pole RC motor vs 10 pole?
Sounds Sweet. You took it all the way up to 33v at how many amps?
Lebowski said:deVries said:Wouldn't it have been much easier to start with more poles wound? 20 pole RC motor vs 10 pole?
Sounds Sweet. You took it all the way up to 33v at how many amps?
that's the whole sport, to use a motor with minimal back-emf and low L and still get it to work
liveforphysics said:We have a solid-slot motor like that at work. It actually comes with giant inductors made to mount in-line with each phase lead to make it kinda/sorta controllable.
The work that Lebowski and RickNZ are doing here with ultra high speed PWM and current control is the key to enabling designs like solid slot motors.
My Mac says Happy New Year to You!Lebowski said:This is very useful for if you have a Mac motor with a one-way clutch in it, with this startup
addition the controller can now operate the Mac in sensorless mode.
It's quite stubborn and would probably be able to start under load (notice its pulling in one direction) :
HAPPY NEW YEAR EVERYBODY !