Load Torque Observer (Im); Various Low Path Filters (Im) - GE VAT2000 Instruction Manual

6-7-7 Load torque observer (IM)

The disturbance load applied on the motor is calculated and the torque command is compensated.
To increase the response toward disturbance, use the load torque observer.
By setting the speed regulator (ASR) to P and using the load torque observer, overshooting can be
suppressed.
Parameter
No.
B30-0 Load torque observer gain
B30-1 Model machine time
constant

6-7-8 Various low path filters (IM)

The time constants of the low path filters used for speed detection, speed commands or torque current
commands, etc., are set.
By adjusting these time constants, vibration caused by noise and overshooting can be suppressed.
Note that if an excessively high value is set, the control performance could drop.
Parameter
No.
B30-3 Speed setting LPF time
constant
B30-4 Speed detection LPF time
constant
B30-5 Speed detection LPF time
constant for ASR
B30-6 Speed detection LPF time
constant for compensation
B30-7 Torque current command
setting LPF time constant
6. Control Functions and Parameter Settings
Parameter
Set the observer gain for the load torque observer.
To increase the responsiveness of the external disturbance
response characteristics, set a large gain.
Note that if the gain is set too high, the output torque could
hunt.
When set to zero, the load torque observer will not function.
Set the model machine time constant used by the load
torque observer.
Parameter
Overshooting can be suppressed by setting this to the filter
time constant equivalent to the speed response.
The speed detection noise is cut.
Set the low path filter time constant used for the speed
detection value input into the speed regulator.
Set the low path filter time constant used for the speed
detection value for constant output range compensation or
iron loss compensation, etc.
Set the low path filter time constant used for the torque
current command.
6-79
Function
Function