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[racerg]

Hey Tom:

No problem! When we release our controller, we will have a forum set-up to discuss everything...I am happy to share whatever I know!

DC vs AC: totally different animals...you need to study torque curves, etc., to decide what's best for you. In most cases, a smaller (say 1/4 HP to 1/2 HP) AC three phase motor will work just fine...

That said, many prefer DC motors and this debate has been raging in the sim world for a long time.

A lot of the pro, larger sim's use AC motors: lower cost, lot's available, easy to drive, etc.

Guess if it was me, I'd use an AC motor, simple...

I've experimented with a lot of motors: steppers, DC brushless servo, AC, etc... I find AC motors to be easy to use and simple to operate...

Gary

[cthiggin]

Gary,
Thanks to you for accepting my apology and hopefully others too!
I'll go the AC route - I'll start building my platform/frame and by that time, you folks may be up to full speed.
Thanks again, and NO MORE from me about "this" stuff on this thread...
Like you said "Back to Controllers"
Have a blessed one.
Tom

[Roadster2]

Hi cthiggin:

3) Two good sources for motors and encoders are: SEW Eurodrive and Nord Geamotors. Some of the motors can be purchased through Grainger here in the USA...make sure it's an inverter duty motor.

-Gary

In case it's of interest; SEW Eurodrive supply the motor/gearbox units to CKAS Mechatronics. SEW Eurodrive have a base in Tullamarine in Melbourne, Australia and this is also the home of CKAS Mechatronics.

[cthiggin]

Roadster2,
Thanks so very very much for the info.
Have a blessed one.
Tom

[jyrki.j.koivisto]

Will there be a braking resistor, or at least an option to add one later? IMHO what makes a difference between a simple controller and a pro one is how they handle transient voltages.

For beginner simmers I'd suggest to stay away from mains voltages, things can get deadly pretty easily.

[racerg]

Hi jyrki.j.koivisto:

We do plan on a braking resistor option...

And, of course, good transient protection!

-Gary

[paiva27]

hello my name is Rafael, I'm from Brazil. I have a project of mount , as http://www.youtube.com/watch?v=r6tu9Ybshd0&feature=plcp,

with the experience the people of the forum, with the board
vellemam k8061 I can do?
and motor AC 1,5hp?


sorry for my english.

[jyrki.j.koivisto]

Hi Rafel,

I don't wan't to hijack this thread, but there are some calculations that I have done for that sim, you can post your questions there if not wanting to start a new thread.

1,5hp motors are plenty but I don't know anything about that velleman product, I would let some dedicated controller take care of all the axis.

[racerg]

Hi Everyone:

It's been a while since I have posted as we have been evaluating our board.

I've now made a major change in processor type...

We are using the STM32F103RB processor, which has a lot of speed and many i/o's that we will use for encoders, etc.

This is a very fast ARM Cortex™-M3 32-bit RISC chip !

Processor speed is 72 MHz, which translates to about 1.25 DMIPS/MHz (Dhrystone 2.1).

It is still using the Arduino language. This much better processor and higher speed will allow us to do a lot more...

More soon!

-Gary

[ferslash]

Gary:

I was looking for a solution like the one you are trying to built, something like plug and play... i found finally the pololu jrk 12v12, this card do all the job, the drawback is that you need one per motor... and the price... $100 usdlls per card...

consider this alternative as your rival... maybe you would like to see pololu's page... and of course... you have your points to improve vs pololu...

if you deliver a less expensive alternative ($ less than 200 usdlls in the simplest case of a 2dof sim)

best regards

fer

(let me know when you have your card... i may be your client)

ferslash@hotmail.com