Siemens simovert masterdrives Compendium

Engineering Information 06.2005
6SE7087-6QX70 (Version AE) Siemens AG
11-18 Compendium Motion Control SIMOVERT MASTERDRIVES
In general, the maximum motor current occurs during the acceleration
phase. At motor torques > M
0
, the motor current may possibly be
higher than calculated with kTn due to saturation effects. In this case,
the motor current is calculated as follows:
I
M
kTn
MM
MM
MI
MI
Mot
Mot
Mot
=
⋅−
−
−
⋅−
⋅
⋅
(( )( ))
max
max
max
11
0
0
2
0
0
for M
Mot
> M
0
I
0
Standstill current
M
max
Maximum permissible motor torque
I
max
Maximum permissible motor current
♦ For induction servomotors
Calculation of the motor current is as described under 11.4.
Acceleration into the field-weakening range with a constant motor
torque results in the maximum motor current in the field-weakening
range at maximum speed.
The following formula is used to calculate the arithmetic mean of the
motor current:
• For synchronous servomotors
I
Mt
kTn T
Mot mean
Mot i i
≈
⋅
⋅
∑
∆
M
Mot i
Motor torque in time segment ∆ t
i
T Cycle time
• For induction servomotors
I
II
t
T
Mot mean
Mot A Mot E
i
=
+
⋅
∑
2
∆
II
Mot A Mot E
+
2
Mean motor current in time segment ∆t
i
(A: initial value, E: final value)

Siemens simovert masterdrives Specifications

General

Brand	Siemens
Model	simovert masterdrives
Category	DC Drives
Language	English