Hello,
I have one problem related to dynamic braking whenever power lost, and after sometime power restore,
i need to apply brake because otherwise motor will take long time to stop.
In this case i will read the speed of the motor through hall sensor once power restore, and synch My IGBTs to that speed and than i decrease the speed to apply quick brake,
My problem, whenever i synch the IGBTs with the current speed only during power on, there is a whistle sound coming from the motor. how to avoid this sound.
During normal braking i am not facing this problem(that means when i apply break, power is not lost) because in this case IGBTs are already sync with the curret speed.
Becuase once power restore, without opening the IGBTs gates i cannot apply quick brake.
If any inputs please let me know....
I have one problem related to dynamic braking whenever power lost, and after sometime power restore,
i need to apply brake because otherwise motor will take long time to stop.
In this case i will read the speed of the motor through hall sensor once power restore, and synch My IGBTs to that speed and than i decrease the speed to apply quick brake,
My problem, whenever i synch the IGBTs with the current speed only during power on, there is a whistle sound coming from the motor. how to avoid this sound.
During normal braking i am not facing this problem(that means when i apply break, power is not lost) because in this case IGBTs are already sync with the curret speed.
Becuase once power restore, without opening the IGBTs gates i cannot apply quick brake.
If any inputs please let me know....