Characteristic values for accuracy of torque and speed

Accuracy
of the calculated
torque

Depends on the accuracy of the motor parameters

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

Deviation with FCB25

< 5% M_N

Typical deviation

< 10% M_N

Maximum deviationIf n is permanently < 20% of the nominal speed.

< 15% M_N

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 × f_{nominal slip}.