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TMS320F280025: Impact of Using Higher-Than-Recommended Estimation Currents on Motor Safety

Analogics Rnd Solar
Intellectual 460 points

Part Number: TMS320F280025

 

While performing motor parameter estimation using the TI Motor Control Lab for a 5 HP motor, the resistance and inductance estimation did not converge when using the current limits recommended in Spruhj1i.pdf.

The estimation completed successfully only after increasing both the resistance estimation current and inductance estimation current to approximately 72% of the motor’s rated current.

Clarification is requested regarding motor impact and safety:
- Does using higher-than-documented estimation currents have any adverse effects on the motor?
- Is this level of current considered safe for short-duration estimation routines?
- What does the requirement for higher estimation current indicate from a motor behavior perspective.

This information is important to ensure that parameter estimation remains both accurate and safe for higher power motor applications.  

  • +1
    TI__Mastermind 23881 points

    Hi,

    Did you make sure to configure the correct number of pole pairs and the correct motor type? The Max Current parameters are primarily to make sure the motor is not damaged during the motor identification process since the MCU will inject current into the motor. The 10% - 40% is merely a recommendation and we do note to increase in 5% increments until the motor is able to obtain motion. 

    What power level and motor voltage are you currently working with?

    Regards,

    Peter

  • 0 in reply to Peter Luong
    Intellectual 460 points

    Hi Peter,

    Thank you for your response.

    Yes, I have verified that the correct number of pole pairs and the appropriate motor type are configured. The motor I am currently working with is a 5 HP motor rated at 250 V and 13 A.

    I understand that the Max Current parameters are intended to protect the motor during the identification process, as the MCU injects current, and that the 10%–40% range is a recommendation with gradual 5% increments to achieve motion. In my case, the motor was not able to obtain motion within the recommended range, but increasing the current beyond this range allowed the identification process to proceed successfully.

    Looking forward to your guidance.

    Regards,
    M.Srihari