Method 2: characteristic curve for asynchronous drive characteristic

Asynchronous motors are frequently used for spindle drives. By means of the speed-dependent spindle accleration a= f(n) shown in the following figure, users can achieve optimum adaptation to the typical characteristic of the spindle motor.

Method 2: characteristic curve for asynchronous drive characteristic 1:
Figure 1-15: Course of acceleration for an asynchronous drive characteristic

Besides the maximum permitted acceleration, a_max, speed N1 for the constant acceleration range, only a further parameter N2 and the high minimum acceleration a_min needs to be parameterized. Acceleration is constant up to the speed N1. Above N1, acceleration is proportional to 1/n, and above N2 it is proportional to 1/n2.

Example characteristic

N1=10000 degrees/s

N2=20000 degrees/s

a_max=16000 degrees/s

As from the nominal speed (nlimit) the characteristic profile is as follows:

Method 2: characteristic curve for asynchronous drive characteristic 2:

Parameters

P-AXIS-00202

Characteristic type 3: asynchronous drive

P-AXIS-00010

Minimum acceleration amin

P-AXIS-00240

Maximum acceleration amax for n<N1

P-AXIS-00241

Speed limit N1 for maximum torque

P-AXIS-00242

Speed limit N2 for maximum output

Parameterization example 

getriebe[0].beschl_kennlinie.typ 3 Asynchronous
operation
getriebe[0].beschl_kennlinie.a_max 16000 [°/s²]
getriebe[0].beschl_kennlinie.a_min 4000 [ ° /s*s] 
getriebe[0].beschl_kennlinie.n1 10000000 [10-3 °/s]
getriebe[0].beschl_kennlinie.n2 20000000 [10-3 °/s]