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Rotor alignment and Offset learning

Moorthi M
Prodigy 40 points
Other Parts Discussed in Thread: TMS320F28069

Hi,

   I am using resolver for rotor position measurement for IM FOC control. How to ensure rotor is aligned with d axis during IM Rotor  alignment and Offset learning process?.

  • 0
    TI__Guru 71526 points

    Hello Moorthi, 

    Please provide more information concerning the system design.  

    What processor/controller are you using?  

    What Motor Driver?

    A block diagram of the system would be very helpful.

    Thanks,

    ~Leonard 

     

  • 0 in reply to LeonardEllis
    Prodigy 40 points

    Hi Leonard ,

    Please find details:

    Controller:TMS320F28069 (C2000)

    Application: EV 

    Motor Driver: Mosfet based VSI

     I need to develop rotor alignment and offset learning algorithm for that referring multiple transaction papers and application notes but i cant able to find how we are ensuring rotor is aligned with D axis or not is not clear.

    I have attached  Math works position sensor calibration block diagram here.

    https://www.mathworks.com/help/mcb/gs/current-sensor-adc-pos-sensor-calib.html

    Regards,

    Moorthi M

  • 0 in reply to Moorthi M
    TI__Guru** 115450 points

    Are you using an ACI motor? If yes, I don't think you need to apply this process for an ACIM since you are using a resolver as a position sensor.

  • 0 in reply to Yanming Luo
    Prodigy 40 points

    Yes. But also i need develop initial position learning algorithm for IPMSM.

    Please share any standard method followed in existing EV vehicle applications.

    Thanks for your support.

    Regards,

    Moorthi M

  • 0 in reply to Moorthi M
    TI__Guru** 115450 points

    You just need to detect the offset one time by using the force alignment method and save it in your project since you are using the resolver which is an absolute position sensor.