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Original question:

DRV10987: DRV10987 shows no output

DRV10987: how 180 sinusoidal commutation applied to trapezoidal (BLDC) Motor..Please help me with this query

meghana ravi
Prodigy 140 points
Part Number: DRV10987

i have a question regarding this motor controller ic DRV10987 , as it uses 180deg sinusoidal commutation scheme ...so what about the torque ripple in motor when we apply sine wave for trapezoidal (BLDC )motor.Can anyone comment on this?? Why they have used sinusoidal commutation scheme for a trapezoidal BLDC MOTOR .The how they can eliminate the ripple in such case?

  • 0
    TI__Mastermind 24415 points

    Meghana,

    Thanks for posting your question in E2E forum.

    The torque ripple will be less for a trapezoidal BLDC motor with 180° sinusoidal commutation compared to 120° trapezoidal commutation. DRV10987 uses a 180° sensor-less control scheme which provides continuous sinusoidal output voltages to the motor phases to enable ultra-quiet motor operation by keeping the electrically induced torque ripple small compared to 120° trapezoidal commutation. 

    I think you are confused by using the term "BLDC" for Sinusoidal BEMF motors. All BLDC Motors need not necessarily be trapezoidal BLDC Motors. Depending on the stator winding distribution and shape of the BEMF, a BLDC motor could be trapezoidal or sinusoidal. Hope this answers your question. 

    Regards,

    Vishnu

  • 0 in reply to Vishnu Balaraj
    Prodigy 140 points

    Thanks Vishnu for clarifying my doubt, i would also like to know does this inductive sense method for initial rotor position detection method used in this IC will work for higher rating motors ?

  • 0 in reply to meghana ravi
    TI__Mastermind 24415 points

    Meghana,

    I'm not sure how many watts it means when you say "Higher rating Motors". But DRV10987 is rated up to 50W so you can use IPD for Motors rated within this power range. 

    Regards,

    Vishnu.