Pole Position Identification - Siemens SINAMICS G120 Operating Instructions Manual
Low voltage converters
chassis devices with cu240b-2 and cu240e-2
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Also See for SINAMICS G120:
- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
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6.18.3.6
Pole position identification
The pole position of a synchronous motor
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.
The inverter 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.
Pole position identification
The inverter must measure the pole position for motors not equipped with an encoder, or for
encoders, which do not supply the information regarding the pole position.
If you are using a Siemens motor, then the inverter automatically selects the appropriate
technique to determine the pole position, and when required starts the pole position
identification.
Motor without an encoder
Each time the motor is switched on (ON/OFF1 command), the
inverter measures the pole position.
As a result of the measurement, the motor responds to an ON
command with a delay of up to 1 second. The motor shaft can
rotate slightly during the measurement.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Advanced commissioning
6.18 Motor control
Identifying the pole position us‐
ing a measurement
299
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