Parameter Description; A.3.2 Parameter Description - Siemens SINAMICS V90 Operating Instructions Manual

5. Calculate the torque.
Calculate the torque according to the load inertia, acceleration time, deceleration time,
and constant motion time.
6. Select the motor.
Select the motor that matches the data in step 3 to step 5.
A.3.2

Parameter description

Torque
● Summit torque: It refers to the maximum torque required by a motor in operation, which is
generally less than 80% of the motor's maximum torque. When the torque is a negative
value, regenerative resistors may be needed.
● Moving torque and hold torque in standstill: It refers to the torque required by a motor in
long-term operation, which is generally less than 80% of the motor's rated torque. When
the torque is a negative value, regenerative resistors may be needed.
Torque calculation methods of two major mechanism types:
W: Mass [kg]
P : Ball screw lead [m]
b
F: External force [N]
W: Mass [kg]
P : Belt transmission lead [m]
d
F: External force [N]
● Effective torque: It refers to the continuous effective load torque converted into the
equivalent value on the servo motor shaft, which is generally less than 80% of the motor's
rated torque.
T : Acceleration torque [N·m]
a
T : Moving torque [N·m]
m
T : Deceleration torque [N·m]
d
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2016, A5E36037884-002
η: Mechanical efficiency
μ: Friction coefficient
g: Gravitational acceleration 9.8 [m/s
η: Mechanical efficiency
μ: Friction coefficient
g: Gravitational acceleration 9.8 [m/s
t : Acceleration time [s]
a
t : Constant motion time [s]
u
t : Deceleration time [s]
d
Appendix
A.3 Motor selection
t : Cycle time [s]
c
]
2
]
2
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