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Sensorless Brushless Startup Procedure

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

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endrophie
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Reply to
CWatters

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            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
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Jim Thompson

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