10-32
PM FOC Sensorless Speed Estimator Bandwidth
Settings
Sets the speed estimator bandwidth. Adjust the parameter to influence the stability and the
accuracy of the motor speed.
If there is low frequency vibration (the waveform is similar to a sine wave) during the process,
then increase the bandwidth. If there is high frequency vibration (the waveform shows extreme
vibration and is like a spur), then decrease the bandwidth.
10-34
PM Sensorless Speed Estimator Low-pass Filter Gain
Settings
Influences the response speed of the speed estimator.
If there is low frequency vibration (the waveform is similar to a sine wave) during the process,
then increase the gain. If there is high frequency vibration (the waveform shows extreme
vibration and is like a spur), then decrease the gain.
10-35
AMR (Kp) Gain
Settings
10-36
AMR (Ki) Gain
Settings
10-39
Frequency Point to Switch from I/F Mode to PM Sensorless Mode
Settings
Sets the frequency for the switch point from low frequency to high frequency.
Due to the weak back-EMF in the low frequency area, PM sensorless mode cannot estimate the
accurate speed and position of the rotor. Thus, using I/F mode control is more suitable. In the
medium-to-high frequency area, PM sensorless can accurately estimate the back-EMF,
stabilizes and controls the motor with lower current.
If the switch point is too low and PM sensorless mode operates at a too low frequency, the motor
does not generate enough back-EMF to let the speed estimator measure the right position and
speed of the rotor, and causes stall and oc when running at the switch point frequency.
If the switch point is too high, the drive easily runs in the frequency area of the I/F mode for a
long time, which generates a larger current and cannot save energy. (If the current for Pr.10-31
is too high, the high switch point makes the drive continue to output with the setting value for
Pr.10-31.)
0.00–600.00 Hz
0.00–655.35
0.00–3.00
0.00–3.00
0.00–599.00 Hz
Chapter 12 Descriptions of Parameter SettingsMS300
427
Default: 5.00
Default: 1.00
Default: 1.00
Default: 0.20
Default: 20.00