7.2.2 PM Auto Tuning
After entering the parameters, set MOT-11 (Auto tuning) to 4 [All(PM)] and perform the auto tuning
operation. When auto tuning is complete, the MOT-16 (Rs), MOT-17 Ld (PM), MOT-18 Lq (PM),
and MOT-19 (PM Flux Ref) parameters are automatically measured and saved.
Changes the speed PI controller gain during a PM synchronous motor
operation in sensorless vector control mode. For a PI speed controller, P gain
is a proportional gain for the speed deviation. If the speed deviation becomes
greater than the torque, the output command will increase accordingly. The
higher the value becomes, the faster the speed deviation will decrease.
The speed controller I gain is the integral gain for speed deviation. It is the
time taken for the gain to reach the rated torque output command while
constant speed deviation continues. The lower the value becomes, the faster
the speed deviation will decrease.
As the motor inertia varies by motor, the gain values should be changed
according to the motor speeds. CON-34 and CON-35 set the low speed P/I
controller gain values, while CON-36 and CON-37 set the high speed P/I
controller gain values, so that an appropriate gain value can be used for
different motor speeds.
Sets the high-speed portion of the feed forward rate against the back-EMF
during a PM synchronous motor operation in sensorless vector control mode.
Feed forwarding enhances operation of the speed estimator.
Increase the value at CON-38 in 10% increments to suppress motor
oscillation under load. A fault may occur if this value is set too high.
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