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CCS/TIDA-010031: When motor speed reaches 80krpm-90krpm, it becaomes instability

Part Number: TIDA-010031

Tool/software: Code Composer Studio

When motor speed reaches 80krpm-90krpm, it becomes instability, how to solve the problem? What parameters or section should we modify for the software source code?

  • Hi, 

    The instability is from the wrong zero-crossing detection. For the different motors, we need tune the BEMF detection threadhold in s/w to tune the zero-crossing level. Please try to tune below data in s/w:

    BEMF_THRESHOLD:  it means the zero-crossing detection level.

    COMMUTATION_BLANK_TIME: it skips the wrong signal after commutation.

    PWM_BLANK_COUNTS: It means sample time delay in order to avoid noise.