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Original question:

NEMA17 BLDC/PMSM 55W Motor

Control kit with trapezoidal back emf motor

Liu Yang
Expert 8775 points
Other Parts Discussed in Thread: 2MTR-DYNO, LAUNCHXL-F28379D, BOOSTXL-DRV8305EVM

Hi Team,

I was looking for a control kit with trapezoidal back emf motor in the Texas instruments products. Do you think such a product exists?
Either that or control kit with induction motor.

Beat Regards,
Tom Liu

  • 0
    TI__Guru** 115440 points

    All of the motor control kis can support both sinusoidal and trapezoidal motors, and ACIM control, which depends on the motor and the control software. You might take a look at the link below. The DRV8312-C2-KIT with the bundled motor can support the trapezoidal control algorithm. 

    [FAQ]Getting Started with C2000 MCUs for Motor Control

    https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/855709

  • 0 in reply to Yanming Luo
    Prodigy 20 points

    I think I may have not asked my question in a clear way. I have already submitted a request to my university to purchase "LP379D-BP8305-DYNO-BNDL" that has LAUNCHXL-F28379D, one 2MTR-DYNO, and two BOOSTXL-DRV8305EVM boards in the package. This 2MTR-DYNO has two motors connected to each other one acting as a load and the other one acting as the prime mover. both of these motors are PMSM motors. based on the manuals available on the Texas Instruments website, a PMSM motor is a motor that has a sinusoidal back-emf. The back-emf shape is an inherent characteristic of the motor and can be seen as the open-circuit voltage of the machine as is dependent on the winding factor and the number of slot per pole per phase (q value) of the machine. A BLDC motor has a trapezoidal back-emf shape which is the result of having a unity winding factor and slot per pole per phase equal to one (q=1). I am looking for a BLDC motor and I saw on the TI page that the DRV8312-C2-KIT is a BLDc motor meaning when you rotate the shaft of the motor and measure the open circuit voltage acrross its terminals, you see a trapezoidal waveform.

  • 0 in reply to Hossein Nejadi Koti
    TI__Guru** 115440 points

    Most of the PMSM or BLDC motors don't have a pure sinusoidal or trapezoidal BEMF waveform which could be near either one. So these motors you mentioned above can support sinusoidal FOC or trapezoidal control.

    You might contact the motor manufacturer to get the detailed specification of the motor you used.