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Original question:

DRV8323: Various PWM modes

DRV8323: Sensored vs Sensorless Trapezoidal Control minimum HW requirements

Kelvin Le THS
Expert 7855 points
Part Number: DRV8323

Hi,

I'm trying to understand the differences in minimum HW requirements and trade-offs between Sensored vs Sensorless Trapezoidal.

Sensored:

Hall sensor for position. Can be used with DRV8323 1xPWM mode for simplicity.

1 current sensor (only 2 phases on at a time).  But this isn't really required if we just have a speed loop only.

Sensorless

No sensors required. Monitor back EMF voltage to determine position.  Requires more SW development.

1 current sensor (only 2 phases on at a time).  But this isn't really required if we just have a speed loop only.

-Kelvin

  • 0
    TI__Guru 65450 points

    Kelvin,

    The deciding factors for this are usually driven by the customer's motor, does it already have hall sensors or not, and how much software they want to develop or reuse.

    Low speed is also tougher with sensorless as we need the back EMF to sense the rotor position and we can't do that at low speed when the control loop is still in open loop mode.

    We have reference code available for both. If you have flexibility in motor selection then personally I would pick sensored since it's simpler to implement and doesn't have as much tuning or low speed dependency.

    Regards,

    -Adam