How to solve the problem that the HSO is sensitive to the motor phase resistance

[XGL]

I have a motor whose phase resistance is 40 mΩ at 20 °C and 45 mΩ at 70 °C. When I set the phase‑resistance parameter to 40 mΩ, the motor operates normally at around 20 °C. However, when the motor temperature rises to approximately 50 °C, frequent start‑up failures occur. How can this problem be resolved?

[GMA]

Hello ​@XGL,

Did you try selecting Start Up RsDC Estimation feature?

[XGL]

Thanks for your reply. I hadn’t enabled this feature. But if I turn it on, won’t errors in resistance identification impact the start‑up function?

[XGL]

Under the condition of the conventional STO observer, the influence of phase resistance appears to be minimal. From this perspective, the HSO seems less stable than the STO.