Pole Position Identification - Siemens SINAMICS G115D Operating Instructions Manual

Advanced commissioning
7.20 Motor control
Parameter
p5314[0...n]
p5315[0...n]
7.20.3.7

Pole position identification

Overview
The converter must know the pole position of the rotor in the motor in order to be able to control
the torque and speed of a synchronous motor.
For encoderless motors, the converter determines the pole position of the motor via a
measurement.
Precondition
The motor remains at a standstill.
Function description
The pole position of a synchronous motor is the deviation between the
magnetic axis in the rotor and the magnetic axis in the stator.
The image below shows you the pole position of a synchronous motor in
a simplified cross-section.
For permanent magnet synchronous motors, the following methods are possible for pole
position identification:
• p1980 = 1: The most reliable and fastest, but also the loudest method
During quick commissioning the converter sets p1980 = 1.
• p1980 = 4: Comparatively quiet method in two steps
• p1980 = 10: Comparatively slow method. This method is only possible if the motor can rotate
freely during pole position identification.
306
Description
Moment of inertia precontrol line‐
ar negative [1/s ]
2
Moment of inertia precontrol con‐
stant negative [kgm ]
2
Setting
Sets the linear coeffi‐
cients for moment of in‐
ertia precontrol in the
negative direction when
the moment of inertia
estimator is active.
Factory setting: 0
Sets the constant coeffi‐
cients for moment of in‐
ertia precontrol in the
negative direction when
the moment of inertia
estimator is active.
Factory setting: 0
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA
In a negative direction
of rotation: Moment of
inertia = p5314 × load
torque + p5315