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How to determine the R and L between Delta and Y connection?

Ssu-Han Huang
Prodigy 210 points

Hi,

I have a question about my motor. My motor is for high speed application but the connection of it is DELTA. I can actually get R and L from RLC meter.

What should I do when I want to use INSTA spin?

The only different is the equivalent R and L ? or anything else? 

Thanks!

Maxwell 

  • 0
    TI__Expert 8675 points
    The InstaSpin software does not care if the motor is wound in delta or star. In the user.h you need to specify the equivalent values for a star wound machine.

    When you measure R and L with an LCR meter you will actually get those values (phase to star point not phase to phase).
    Alternatively you can calculate those R/L star equivalent values if you know the delta values.

    Let me know if it worked!
  • 0 in reply to Simon Jagla
    Prodigy 210 points

    Thanks a lot!!

     Please let me make sure again

    When I use RLC meter to get the resistor R from two terminals of "Delta" motor.

    The Re specified in user.h should be R/3(regards it as Y-connected motor).

    Is it right?

    Thanks

  • 0 in reply to Ssu-Han Huang
    TI__Expert 8675 points
    No. if you are measuring the R/L with an LCR meter you will get 2R and 2L of the phases in the equivalent star connection.
    If you are using the identification process then the MCU will also measure those values in the same way and use them to configure the control loops.

    To specify your motor in the user.h just measure the values with the RLC meter and divide by 2.