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Original question:

DRV10983: Commutation

DRV10975: BEMF Constant

Naizeng Wang
Expert 5470 points
Part Number: DRV10975

Hi team,

I have one question about DRV10975.

BEMF=kt*V;

BEMF is sin wave. Why Kt is constant?

Br.

  • 0
    TI__Mastermind 24415 points

    Hi Naizeng,

    Thanks for posting in E2E forum. Correction in your equation. BEMF is product of BEMF Constant (Kt) and Speed (Electrical Hz). Unit for BEMF constant is Vpeak/Hz. Here, Vpeak is the peak voltage of the BEMF Sine wave. This peak voltage is directly proportional to speed. In other words, when Vpeak increases, speed also increases. So Kt is constant. I think you are getting confused between peak value and instantaneous value of sine waveform. Peak value of a fixed amplitude sine waveform will always be constant whereas the instantaneous value of a sine waveform changes with time. 

    Regards,

    Vishnu