Fuji Electric Faldic-a RYS-R Series - Page 285

11-8
MHT260a (Engl.)
(ii) Load torque via conversion into motor shaft (T
L
)
()
T
L
W
BP
GL m]=
×
××=
××
×
×× =
µ
η
ππ
・
9.81
210
0.1 20 9.81
20.9
10
10
1 1 0.03
33
/[N
Where, μ: Friction coefficient = 0.1, η: Mechanical efficiency = 0.9
(iii) Shortest accel./decel. time (tac/tdc)
Of the motor which meets the following conditions ; J
L
≦ 5 × J
M
and T
L
≦ T
R
(rated torque ) × 0.9
0.2 [kW] motor is temporarily selected. :
Where,
T
L
= 0.03 [N・m], J
L
= 0.11 × 10
-3
[kg・m
2
], from motor data according to 2.1 : rated torque = 0.637 [N・m], breakdown (max.) torque =
1.91 [N・m], moment of motor rotor inertia = 0.0216 × 10
-3
[kg・m
2
] for 0.2 [kW], GYC 201DC1-S motor.
a) Shortest accel./decel. time
t
AC
=
+× ×
−
=
×+× ××
−
=
−−
()
()
(. . )
(. . )
.
JJ N
TT
ML
AC L
2
60
0 0216 10 0 11 10 2 3000
60 191 0 03
0 022
33
ππ
[s]
b) Accel./decel. torque for application to soft operation (0.05 [s] accel. time) from 0 to 3000 [r/min] speed
TAC =
+× ×
×
+=
×+× ××
×
+=
−−
() (. . )
.
..[]
JJ N
t
TNm
ML
ac
L
2
60
0 0216 10 011 10 2 3000
60 0 05
003 086
33
ππ
・
Where,
J
M
: Moment of inertia of motor [kg･m
2
]
N : Motor speed [r/min]
T
AC
: Max. torque which can be output within an increase from 0 to 3000 [r/min ]
(iv) Operation pattern
0.86
0.03
0.86
0.05
0.050.05
50[mm]
500[mm/s]
(v) Moving length of ball-screw
Moving velocity (v) of mechanical equipment system at 3000 [r/min] motor speed (N)
v ＝ × BP × GL ＝ × 10 × (1/1) ＝500 [mm/s]
3000
60
N
60
[N・m]