Characteristic values for accuracy of torque and speed

ASM in VFCPLUS without encoder

ASM in VFCPLUS with encoder

 

Without motor with temperature sensor

With motor with
temperature sensor

Without motor with
temperature sensor

With motor with
temperature sensor

Inaccuracy of the calculated torque

The more accurate the motor parameters, the more accurate the torque. For greater torque accuracy, measure the motor parameters with FCB25.

 

With FCB25

< 5% MN

 

Typical

< 10% MN

 

MaximumIf n is permanently < 20% of the nominal speed.

< 15% MN

< 25% MN

< 15% MN

CFC without motor temperature sensor

CFC with motor temperature sensor

Accuracy
of the calculated
torque

depends on the accuracy
of the motor parameters and
motor temperature

depends on the accuracy
of the motor parameters,
typical deviation: < 5% MN

VFCPLUS without encoder

ELSM®

All control modes with encoders

Accuracy
of the calculated
speedStationary inaccuracy is the deviation between the mean value of the exact physical speed and the speed setpoint.

depends on the accuracy
of the motor parameters,
typical deviation: 0.2 × fnominal slip.

In closed-loop control mode (type: N > 2% nN): 10-4 min-1

Maximum deviation:
0.007% nsetpoint, 10-4 min-1