Delta VFD300C43S-HS User Manual page 497

12-2-4 Permanent Magnet Motor Adjustment (IPM Sensorless)
12-2-4-1 Pr.00-11=7 Interior PM FOC sensorless vector control (IPM sensorless)
1. Control Diagram
IPM sensorless FOC mode (applicable for C2000-HS V2.05 and above)
※ PM Sensorless FOC control is the control method dedicated for IPM, it uses the high salient
pole characteristic (Lq > Ld) of IPM to detect the positions of NS magnetic poles. By doing this,
it calculates the motor's rotor position at low-speed frequency.
Chapter 12 Description of Parameter SettingsC2000-HS
12.2-00-27