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Define ACIM parameter from motor nameplate

Paul Rouviere
Intellectual 265 points

Hi,

I already know and use with success the Instaspin ID process to identify several ACIM motor with the HV eval kit and also with my custom board.
One of my customer ask us to work only with the motor nameplate because:
- He can do so with it's current VFC (FOC) from Schneider.
- He can change it's motor provider with an equivalent motor depending on it's supply chain.
- For sustaining old equipment  he can change a motor on the field with a equivalent ACIM motor found on a local provider.

Do you know a way to compute the mandatory parameter from a name plate like the following one?

Best regards,
Paul

  • 0 in reply to ChrisClearman
    Intellectual 265 points

    Hi Chris,

    I checked the chapter 4.8, but all the industrial motors used by my customers don't have the necessary information on the nameplate in order to compute the required parameters following the chapter 4.8 example.

    Below an other example of a name plate on a Bonfiglioli BN71B4.
    The information are only:
    - Rated voltage
    - Rated current
    - Rated mechanical power
    - Rated speed
    - Rated frequency
    - Rated Cos Phi

    Is it possible to have a rough estimation of motor parameter with that information ?
    Or should I guess with similar name plate information I could use the parameters from a similar motor (identified by InstaSpin on a real motor)...

    Best regards,
    Paul 

  • 0 in reply to Paul Rouviere
    TI__Guru** 119680 points
    no, I don't think you are going to be able to just use the parameters of another motor with similar nameplate. there are many motors that will meet this nameplate but will have very different motor parameters.

    there are ways to figure out enough of the information to do some level of control, but it is not ideal. See this post:
    e2e.ti.com/.../334853

    but motor parameters are critical for sensorless observers (like FAST) to work correctly, so there is no way around this.

    Are you sure the Schneider drive is doing FOC? They may just be doing V/Hz or some other type of control scheme that isn't using an observer. Or they could be getting enough of the basic information like Rs and Ls initially and then using a different type of learning mode to find the magnetizing current. There are certainly drives companies who have much more advanced overall drive commissioning solutions than we do, though we still think purley for a sensorless observer FAST is the best solution on the market.
  • 0 in reply to ChrisClearman
    Intellectual 265 points
    Ok, thank you for this details.

    Even if I'm still in the learning curve with InstaSpin, I agree FAST observer works really fine.

    Regarding the Schneider ATV312 drive there is several mode: SVC (sensorless) and V/Hz.
    This drive need to enter parameter from name plate:
    - Nominal Frequency (50 / 60 Hz)
    - Nominal Voltage
    - Nominal current
    - Nominal RPM
    - Cos Phi

    It can do autotune, after a motor change in my customer office, I saw the motor doesn't run fine the first time.
    After that the second run was fine, maybe this drive can tune something during runtime.

    Best regards,
    Paul