• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 758 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

DRV10983EVM: How to enter winding resistance of 0.31 Ohm? Where can I find an example for BLDC gear-pump with 2A current?

Edelbert Greiner
Prodigy 50 points
Part Number: DRV10983EVM
Other Parts Discussed in Thread: DRV10983

How can i get the motor running? It moves very short and stops. After a few seconds the motor restarts.

To enter value of windig resistance, i found no way of entering 0.31Ohm. Displayed value jumps to 0Ohm.

I tried to follow application note AN_DRV10983 but with no useable result.

The motor has 0.31Ohm resistance, runs at 24V with maximum power 50W. (300..5000rpm)

Stator has 6 coils.

For my purpose, lower speed operation at 20W seems to be sufficient.

  • 0
    TI__Mastermind 18900 points

    Hey Edelbert,

    How do can i get the motor running?

    This motor, restart behavior usually results from 3 sources: incorrectly programmed Phase Resistance, incorrectly programmed Kt, and Tcontrol (lead time).

    Phase to Phase resistance is found by taking a digital multimeter and measuring the resistance between any of the two phase wires, and phase resistance will be half the phase to phase resistance:

    R_ph_ph / 2 = R_ph_ct

    For Kt, we highly recommend finding that number by taking a scope probe between two of the phases, physically rotate the motor, and measure Voltage (peak to peak) and frequency of the BEMF. Then, Kt will come from dividing the peak to peak voltage by to 2 and dividing by frequency:

    Kt = (V_pk_pk/2)/(f_BEMF)

    For Tcontrol, go to the Control Advance Time Fine Tune section in the tuning guide and follow the instructions there. Tcontrol usually ranges between 30us to 450us.

    These steps are reiterated in the tuning guide: http://www.ti.com/lit/ug/slou395d/slou395d.pdf  

    I found no way of entering 0.31Ohm:

    This sometimes happens when the local language keyboard settings interact with the GUI. Can you add the line  "useLocaleDecimalPt=False" to the <DRV109xx EVM.ini> file? The file path by default is: C:\Program Files (x86)\Texas Instruments\DRV109xx EVM

    Best,

    -Cole