Mechatronics > Motor Control

Help with Arduino control of an Out Runner Brushless motor

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ElectroNick:
I'm just starting this topic to help one of our visitors hook up an RC helicopter BLDC motor to the Arduino-based controller here.

The datasheet on the motor is in the attachment below and it's been said that the motor is just vibrating and not turning:

--- Quote ---NO ITS JUST VIBRATING AND NOTHING HAPPENS IT IS MOTOR THAT NORMALLY USES FOR HELICOPTERS IM TRYING TO RUN IT WITHOUT ESC THAT’S WHY I AM TRYING TO MAKE IT.
--- End quote ---

ElectroNick:
Did you by any chance build the full circuit as on this page: http://elabz.com/brushless-dc-bldc-motor-with-arduino-part-3-the-stroboscope-project/ (about 1/3 of the way down the page there's the schematic)? It has the RPM control potentiometer which you may want to play with - it sounds as if the RPMs are too high for the motor to start properly - in other words, the commutation of the windings is switching too fast and the moment of inertia does not let the rotor to pick up the pace quick enough. You may want to lower the RPM down all the way, then bring it back gradually.

By the way, this is a good high-amp motor, the SN754410 chip can only deliver 1A per winding - about 1/10th of what this motor is capable of.

What is the motor control voltage on the Pin 8 of the SN754410?

sa898:
yes i built the full circuit i think you are right about the current, so what ic should i use here to drive the motor? and i supplied 12 volt in sn754410Ne.

sa898:
And i have tried the pot thing so idnt thing that could be a problem

ElectroNick:

--- Quote from: sa898 on January 21, 2013, 12:16:24 AM ---And i have tried the pot thing so idnt thing that could be a problem

--- End quote ---
Sorry I didn't quite understand because of the typo: you did try to control the rotation with the pot and it did not change the motor's response?

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