Control BLDC Motor with 555 Timer: Tutorial & Schematics

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A Brushless DC Motor can be controlled using a 555 Timer by employing pulse-width modulation (PWM) to adjust the motor's speed through the duty cycle of the output signal. A schematic is provided that allows for varying both frequency and duty cycle, with the duty cycle being the critical factor for speed control. To achieve a duty cycle lower than 55%, an optional diode can be connected from pins 7 to 2/6. It's important to note that if the motor requires more than 200mA, a transistor may be necessary to handle the current. This method is a viable solution for controlling a BLDC motor with a 555 Timer.
MRClark32493
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I have read that it is possible to control a Brushless DC Motor With A 555 Timer, However I Do Not Know How To Accomplish This, And Have Been Unable To Find Any Schematics For This. Could Someone Please Explain To Me How To Do This And Provide Images Or Schematics. Also, If It Is Not Possible To Accomplish With The 555 Timer, Then Could You Please Direct Me In Another Location To Easily Control A Brushless DC Motor.
Thanks
~Matt
 
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You want to use pulse-width modulation. You can variably change the motors speed by changing the "duty-cycle" of the square wave output from the 555. Here is a simple schematic which will vary the frequency as well as the duty cycle, although that shouldn't make much of a difference (the % high time is really all that matters after about 30Hz).

pulsewidthmodulator.png


The optional diode from pins 7 to 2/6 will allow you to get a duty cycle of lower than 55%.
 
Ok, thank you. Now just to make sure that i got this correct,
I supply my voltage to 8
The speed is controlled by a pot between 7/6
And my output is between 3 and ground.
I am fairly new to EE so i would just like to double check everything.
Thanks
~Matt
 
Yeah that's correct. If your motor needs more than 200mA you might need a transistor.
 

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