Sensorless three phase brushless DC motor drive simulation problem

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Hi, i am building a simulink model of Sensorless brushless DC motor drive based on six-step communication, basically i use the zero-crossing detection first, and connect it to a state flow chart which states six step of the communiction logical, but i just can not get the back emf right, and there is no difference between three phase, i wonder what is wrong here, the sate flow and bemf on attachment, thank you!

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Shivam Gothi 2024-9-30

Hello @Juncheng,

If possible, can you please provide the simulink model? This will assist in diagnosing the issue you're experiencing and recommending potential solutions to address it.