Engineering Information 06.2005
6SE7087-6QX70 (Version AE) Siemens AG
11-28 Compendium Motion Control SIMOVERT MASTERDRIVES
♦ Positioning accuracy
∆s
D
mm
gear
G
=
⋅
⋅=
⋅
⋅=
°
π
α
π
360
60
014
360
3
60
0061
.
.
i.e.
±00305.mm
∆s
D
iz
mm
encoder
=
⋅
⋅
=
⋅
⋅
=±
ππ014
10 4096
001
.
. with an 8-pole resolver
∆∆ ∆ ∆ss s s
tot mech gear encoder
=++
=+ + = <01 00305 0 01 01405 0 2.. . . .mm
The required accuracy is thus complied with.
Selection with regard to the dynamic limit curve
♦ The maximum motor torque occurs here because the deceleration is
equal to the acceleration.
M
Mot max
=++ +⋅
⋅⋅
MMMM
i
bMot
bG
b load W
mech
G
()
1
ηη
=+++⋅
⋅⋅
M
bMot
0 914 179 2 27 47
1
10 0 9 0 95
.(..)
..
=+MNm
bMot
25 08.
where
MJ iJ J s
b Mot Mot load Mot Mot
=⋅ ⋅=⋅⋅=⋅
−
α 914 10 914
2
.
The first 1FT6 motor with n
n
=3000 rpm, which satisfies the condition or
the dynamic limit curve, is the 1FT6084-8AF7 with P
n
=4.6 kW,
M
n
=14.7 Nm, M
max perm
=65 Nm, J
Mot
=0.0065 kgm
2
(with brake),
k
Tn100
=1.34 Nm/A, η
Mot
=0.92; M
0
=20 Nm
♦ The acceleration and deceleration torque for the motor rotor is thus:
MNm
bvMot,
..=⋅=00065 914 5 94
♦ The maximum motor torque is equal to the motor torque during
acceleration:
MM Nm
Mot Mot bmax
...==+=594 2508 3103
4. Selection of the
motor
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