Sensorless Brushless Startup Procedure

[endrophie]

Hello,

if you have a look to a modern brushless controller for radio
controlled flying models you can see

- that the motor has a very short startup time until the right moving
(about 100-200ms)

- that no initial alignment for a known position is done

- that a backward rotation only about 30 - 60 ms after starting is
recogniced and the motor is running in the right direction

- that because of the used 8 bit Microcontrollers there is no extrem
complex algorithm possible

- that the controller works probably in voltage controll

Does anywhere have information about the used startprocedure or a
webside/usegroup where mor information is available?

Best regards

Endrophie

 

[CWatters]

"endrophie" <endrophie@aol.com> wrote in message
news:2bb51ebd.0412050225.486c0ae5@posting.google.com...

Does anywhere have information about the used startprocedure or a
webside/usegroup where mor information is available?

http://www.eng.nus.edu.sg/EResnews/9805/p13.html

 

[Jim Thompson]

On Sun, 05 Dec 2004 19:52:15 GMT, "CWatters"
<colin.watters@pandoraBOX.be> wrote:

"endrophie" <endrophie@aol.com> wrote in message
news:2bb51ebd.0412050225.486c0ae5@posting.google.com...

Does anywhere have information about the used startprocedure or a
webside/usegroup where mor information is available?

http://www.eng.nus.edu.sg/EResnews/9805/p13.html

I've used a ring oscillator to start EC motors, where the sensing was
just the back-EMF of each winding... once turning switch to
EC-control.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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