Kneeshaped Acceleration Characteristic Curve; Adaptation To The Motor Characteristic Curve - Siemens SINUMERIK 840D sl Function Manual

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B2: Acceleration

5.2 Functions

Kneeshaped acceleration characteristic curve

Various types of motor, particularly stepper motors, have a torque characteristic that is highly

dependent upon speed and shows a steep decrease in torque in the upper speed range. To

ensure optimum utilization of the motor characteristic curve, it is necessary to reduce the

acceleration once a certain speed is reached.

Simulation of torque characteristic

For the purpose of simulating the torque characteristic of the motor characteristic curve, the

machine data:

MD35242 $MA_ACCEL_REDUCTION_TYPE =

can be used to select various types of characteristic curve:

Torque decrease zone

Speed above which reduced torque has to be assumed

Maximum speed

(corresponds to creep acceleration)

Torque characteristic curve of a motor with torque characteristic that is highly dependent

= Constant characteristic

= Hyperbolic characteristic

= Linear characteristic

characteristic

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

Basic Functions

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