Sensorless Brushless Startup Procedure

Dec 05, 2004 2 Replies

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


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 | I love to cook with wine. Sometimes I even put it in the food.

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