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Limiting the
maximum torque
6 – 170
MP2312.0-8 Reference value for utilization of feed motors for axes 1 to 9
Input:
0 to 1000.000 [· rated current of motor]
0 or 1: Reference value is rated current of motor
MP2313
Reference value for utilization display of the spindle motor
Input:
0 to 1000.000 [· rated current of motor]
0 or 1: Reference value is rated current of motor
For axes, the torque is limited to the value taken from the list of either the
power modules or the synchronous motors, whichever is lower.
With Module 9158 you can limit the torque. The torque-producing current
required for the desired torque must be transferred to the module.
Formulas for calculating the torque-producing current:
Synchronous motor:
⋅
M
2
------------- -
=
I
q
k
M
I
: Torque-producing current
q
M: Desired torque
k
: Torque constant (from motor table)
M
Asynchronous motor:
Two distinctions must be made with asynchronous motors:
n
Anchored speed range (speed < threshold rpm for field weakening)
⋅
⋅ ⋅ ⋅
2 π
M n
N
--------------------------------------------------------------
I
=
⋅
q
P
60
N
I
: Torque-producing current
q
M: Desired torque
n
: Rated speed (from motor table)
N
I
: Rated current (from motor table)
N
I
: No-load current (from motor table)
0
P
: Rated power output (from motor table)
N
n
Variable speed range (speed > threshold rpm for field weakening)
⋅
⋅
n 2 π
⋅ ⋅ ⋅
M n
N
--------------------------------------------------------------------- -
I
=
⋅
⋅
q
P
n
N
FS
I
: Torque-producing current
q
M: Desired torque
n
: Rated speed (from motor table)
N
n: Current speed
I
: Rated current (from motor table)
N
I
: No-load current (from motor table)
0
P
: Rated power output (from motor table)
N
n
: Threshold speed for field weakening (from motor table)
FS
2
2
I
–
I
N
0
2
2
I
–
I
N
0
60
HEIDENHAIN Technical Manual TNC 426, TNC 430
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