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Old Jul 20, 2014, 04:45 AM
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BLDC ESC not working well

Hi,
I have a project of building an sensorless Electronic Speed Controller for Brushless DC Motor, I made a research so as to understand how to do it, for testing I used an HDD brushless motor. After researching how the electronic components work and how the motor works and the way it could be controlled, I made the circuit on a solderless breadboard, and wrote a long code that includes the open loop and the closed loop. The problem is that when I test the circuit on an HDD brushless motor, it doesn't start spinning untill I rise the PWM duty cycle to a certain level, can someone explain me why?
Thank you
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