Speed controller for brushless

[lombafly]

Hi all , i'm Andrea and I write from italy. Sorry for my english , it's very bad...

I'm looking for a schemes of speed control for brushless motors.

Somebody it may help me?
If yes i'm very thankful

Bye

Andrea Lombardi
Italy
http://lombafly.altervsita.org

[Ron van Sommeren]

Ciao Andrea,

Your English is better then my Italian :)

Have a look at this compilation thread:
http://www.rcgroups.com/forums/showthread.php?s=&threadid=140454
http://www.rcgroups.com/forums/showthread.php?s=&threadid=203150

Met vriendelijke groet ;) Ron van Sommeren
diy brushless e-motor (http://www.yahoogroups.com/group/lrk-torquemax/) homebuilders discussion.

[lombafly]

Thanx very much , but.. I have visit this site http://www.aerodesign.de/peter/2001/LRK350/SPEEDY-BL_eng.html ... It's always necessary a oscilloscope for make a controller?

Still thanks
Andrea

[jeffs555]

Andrea,
If you buy the kit, or the board and programmed processor, you shouldn't need an oscilloscope.

Jeff

[Ron van Sommeren]

The pictures on Peter Rother's page were made using a oscilloscope, to give us an idea how the 3-phase 'mechanism' works. I'm not sure whether you not one to build a Speedy-BL. However, if you have made an error in the assembly, you certainly need one to figure out what went wrong. I know of at least one Italian who built a Speedy-BL. I'll send you his e-mail via your site.

Groeten ;) Ron

[JohnnyB]

Ron,

Are you implying in your reply that there are better designs than the speedy BL controller?

Secondly, are the free PC oscilloscopes too slow to perform the high rate of signal frequency required?

Thanks,

Johnny

[Ron van Sommeren]

No, the Speedy-BL is the most used diy controller around. But it involves soldering SMD components, not everyone's cup of tea.

I don't know anything about the free oscilloscopes.

Groeten, Ron

[vintage1]

Most PC based scopes will be marginal. I beleive thay sample at very low rates.

You can get a sampling addon for not much money that is better.

You can get an old scope on ebay for maybe 100 euros if you are lucky, that will be good enough.

[jeffs555]

The sample rate on most sound cards is at least 44khz with some as high as 192khz. This should be fast enough to see the servo pulse coming in, and also the commutation pulses and back emf at least during startup and up to medium speeds. I haven't built a Speedy-BL, so I don't know what other signals you would need to look at to debug it.

Jeff

PS The best debugging tool for home built SMD boards is a good magnifier or microscope to look for solder shorts and opens.