Siemens SINAMICS PERFECT HARMONY GH180 - Motor Equivalent Circuit Parameters and Control Loop Gains in NXG Control

8.26 Motor Equivalent Circuit Parameters and Control Loop Gains in
NXG Control
This section provides a description of the motor parameters used to adjust additional
compensations of the control. Refer to the Motor Menu section of Chapter Parameter
Assignment / Addressing for further operational description.
1. No-load current (1060): This represents the reactive current absorbed by the motor when
operating under no-load conditions. For medium voltage motors this parameter is typically
in the 15.0% to 30.0% range. This parameter is used by the control to improve the transient
performance of the 󹪞ux regulator during sudden load or speed demand changes. This
parameter has no signi󹪝cant e󹪜ect on steady state performance of the control.
2. Leakage inductance (1070): This parameter represents the total leakage inductance of the
motor, and is approximately equal to the sum of the stator and rotor leakage inductances. For
medium voltage motors this parameter is typically in the 15.0% to 20.0% range. This
parameter is used by the control to improve the performance of the 󹪞ux regulator under
transient conditions, such as sudden load or speed demand changes. This parameter has no
signi󹪝cant e󹪜ect on steady state performance of the control.
3. Stator resistance (1080): This parameter represents the per-phase resistance of the stator
windings. For medium voltage motors this parameter is typically in the 0.02% to 2.0% range.
The larger the horsepower and higher the motor e󹪟ciency, the lower the stator resistance
value will be. If the stator resistance is not known then it is preferable to start with the default
value of 0.1%, unless high starting torque is desired, i.e. greater than 80%. It is very
important to set this parameter correctly when high starting torque is desired.
4. Inertia (1090): This parameter represents the inertia of the system and is used by the control
to display the value of inertia that is estimated after auto-tuning stage 2. Changing this
parameter does not a󹪜ect control operation.
Note
Motor parameter values requirement
An accurate value of the motor parameters described in this section is required only in a high
performance application, i.e. one in which high starting torque, approximately 100%, is
required or when steady state operation below 2 Hz with high load torque is required.
Advanced Operating Functions
8.26 Motor Equivalent Circuit Parameters and Control Loop Gains in NXG Control
NXGPro+ Control Manual
338 Operating Manual, A5E50491925A