Omron MX2 Series User Manual page 308

6 Vector Control and Applied Functions
PM Motor Initial Pole Position Estimation
The PM motor initial pole position estimation function estimates the magnetic pole position of the PM
motor in a stop state and causes the inverter to start its output according to the estimated magnetic pole
position.
Set PM motor parameters according to 6-8-4 Offline Auto-tuning for PM Motor Parameters on page
6-57 or 6-8-5 PM Motor Parameter Settings on page 6-61 in advance, because the function uses these
settings to estimate the magnetic pole position of the PM motor.
• Set the PM Motor Starting Method Selection (H123) to 01 (Initial pole position estimation enabled).
• The PM motor initial pole position estimation function causes the inverter to output a high-frequency
detection signal to estimate the magnetic pole position. This means that the estimated position is
more accurate as the values set in the PM Motor Initial Pole Position Estimation 0V Waiting Times
(H131)/PM Motor Initial Pole Position Estimation Detection Waiting Times (H132) or in the PM Motor
Initial Pole Position Estimation Detection Times (H133) is larger.
However, the motor staring time becomes longer in proportion to the set PM Motor Initial Pole Posi-
tion Estimation 0V Waiting Times.
• If the accuracy of the estimated position remains low and the motor still rotates during startup even
after you increase the PM Motor Initial Pole Position Estimation 0V Waiting Times (H131)/PM Motor
Initial Pole Position Estimation Detection Waiting Times (H132), increase the PM Initial Pole Position
Estimation Voltage Gain (H134) value to raise the voltage level of the detection signal.
• Depending on the phenomenon during startup, refer to the following table to adjust necessary motor
parameters.
Phenomenon
Initial pole position estimation
time is too long.
Motor rotates excessively for
positioning.
An overcurrent trip occurs.
6 - 66
Adjustment method
Decrease the PM Motor Initial Pole Position Estimation 0V Wait-
ing Times value.
Decreasing the value too much may cause the motor to rotate
excessively for positioning or stall.
Decrease the PM Motor Initial Pole Position Estimation Detec-
tion Waiting Times value.
Decreasing the value too much may cause the motor to rotate
excessively for positioning or stall.
Decrease the PM Motor Initial Pole Position Estimation Detec-
tion Times value.
Decreasing the value too much may cause the motor to rotate
excessively for positioning or stall.
Increase the PM Motor Initial Pole Position Estimation 0V Wait-
ing Times value.
Increase the PM Motor Initial Pole Position Estimation Detection
Waiting Times value.
Increase the PM Motor Initial Pole Position Estimation Detection
Times value.
Gradually increase the PM Initial Pole Position Estimation Volt-
age Gain value.
Increasing the value too much may cause an overcurrent trip.
Gradually increase the PM Initial Pole Position Estimation Volt-
age Gain value.
Decreasing the value too much may cause the motor to rotate
excessively for positioning or stall.
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Adjust-
ment item
H131
H132
H133
H131
H132
H133
H134
H134