This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • Resolved

DRV10974: UVW operation in PWM=LOW

Expert 3110 points

Replies: 4

Views: 54

Part Number: DRV10974

Hi,

There is U output in PWM=Low.

Could you let me know it is normal operation?

  • Hi David,

    We will get back to you by end of the day.

    Regards,

    Vishnu

  • In reply to Vishnu Balaraj:

    Hi David,

    The device should be in low power mode if the input PWM voltage is less than 0.6V and the PWM turn-off/low time is less than 25 ms. In low power mode, motor should be stationary and there should not be any switching happening in the inverter. Can you make sure there is no positive offset voltage in the PWM pin? The reason why I ask this is because when the analog voltage on the PWM pin is above zero-speed analog voltage then the device exits low power mode and we can see some switching happening in the inverter. Also, can you pull the PWM pin to GND and check the phase U voltage? Ideally, you shouldn't see any switching when PWM is pulled low. 

    Regards,

    Vishnu.

  • In reply to Vishnu Balaraj:

    Hi Vishnu,

    There was some issue and it's closed. Thanks.

    U to V resistance is 0.7Ohm.

    In the datasheet, recommended range is 1Ohm to 20Ohm.

    For supporting this motor, what is tuning factor?

    Thanks.

  • In reply to David Park:

    Hi David,

    Since the motor resistance is out of range, we may not be able to tune the motor up to the rated speed. I highly recommend to refer to the tuning guide to tune the motor. This tuning guide has quick tuning and comprehensive tuning methods. The goal of quick tuning is to get the motor running quickly by inferring usable resistor values for the current (CS pin), lead time (ADV pin), and acceleration profile (RMP pin). The comprehensive tuning section covers the methodology for tuning each resistor value experimentally.

    Regards,

    Vishnu

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.