HEIDENHAIN MANUALPLUS 620 - Page 1467

January 2012 7.12 Configuration of the Lathe 1467
The work done by the motor force FM within one revolution of the drive gear
wheel is equal to the work done by the contact force Frst of the tailstock on
the path Δs (not considering friction losses in the ball screw).
Therefore:
This equation results in the motor torque DM, depending on the contact force
Frst of the tailstock:
Therefore:
The factor must be entered in MP_forthTorqueFactor.
Based on the motor torque DM calculated as described, the torque-producing
current Iq as a limit value is obtained using the data from the motor table.
 Asynchronous motor (static torque):
F
M
2π r
A
F
rst
Δs⋅=⋅⋅
2π D
A
F
rst
Δs⋅=⋅
2π D
M
⋅
r
A
r
M
---------
F
rst
Δs⋅=
⋅
D
M
1
2π
--------
r
M
r
A
---------
Δ⋅ sF
rst
⋅⋅=
1
2π
--------
r
M
r
A
---------
Δ
⋅ s⋅
D
M
forthTorqueFactor F
rst
⋅=
I
q
D
M
nn 2π I
N
2
I
0
2
–⋅⋅⋅
P
N
60⋅
-------------------------------------------------------------------------------------
=
I
q
forthTorqueFactor F
rst
⋅ nn 2π I
N
2
I
0
2
–⋅⋅⋅
P
N
60⋅
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=