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DRV8353RS-EVM: DRV8353: Challenge in understanding how achieve the maximum toque using the Universal Motor Controller Lab

Premkumar T
Intellectual 455 points
Part Number: DRV8353RS-EVM


Hello All,

I'm using the F2800157f and DRV8353RS and the Universal Motor Controller Lab VER 5_02_00_00 to program a 1.8 Kw Hub-Motor motor.

We are able to reach the maximum torque of 100Nm, Beyond 80Nm the DC current is getting varying, Motor getting more noice and speed is not constent it's getting redused. Spacification of Motor is 1.8Kw, 120Nm Peak torque, Maximum speed is 720 RPM.

At Torque beyond ~80 Nm Motor emits increased audible noise at higher torque. Motor speed is not constant and reduces when torque demand increases (at/above ~80 Nm).

We are unable to reach the nameplate peak torque (120 Nm) with stable speed and current.

Thanks,

 

  • 0
    TI__Expert 5425 points

    Hello,

    Are you making sure that your power supply can deliver enough current to reach the desired torque? The first thing I would check is to make sure you are not hitting any current limits here.

    Next, I would ask if you have set the motor parameters correctly in the lab files based on your motor? This will help to tune the code for your motor. In turn, this will reduce noise, smoothen operation, and increase power capability as the commutation is cleaner with correct parameters.

    Thanks,

    Joe

  • 0 in reply to Joseph Ferri
    Intellectual 455 points

    Hi Joe,

    Thank you for your information. Yes, I'm using 80A Power supply without limitations.

    I set the motor parameters are correctly but still am facing the same issues.

    Thanks & Regards

    Prem

  • 0 in reply to Premkumar T
    TI__Expert 5425 points

    Hi Prem,

    Thanks for confirming. 

    What is the PWM frequency used? This may have an impact on operation as well.

    Next, I would like to see waveforms during operation to continue debugging the issue.

    Would you be able to get waveforms of:

    1. VM, SHA, GHA, and Phase A current during lower torque (no noise)

    2. VM, SHA, GHA, and Phase A current above 80nm (noise conidition)

    This might help to discover an issue by observing the difference between noisy and non-noisy waveforms

    Thanks,

    Joseph