Specifications

11– 12
11.SELECTION
Servo motor speed
[r/min]
3000
Time[s]
0.05
t o = 1.0
t f = 1.5
0.05 t s
Tpsa Tpsd 0.15
(4) Operation pattern
(5) Load torque (converted into equivalent value on servo motor shaft)
Travel per servo motor revolution
∆S = PB •
1
n
= 10[mm]
TL =
µ • W • g • ∆S
2 x 10
• π • η
3
= 0.23[N • m]
(6) Load inertia moment (converted into equivalent value on servo motor shaft)
Moving part
JL1 = W •
∆S
20π
()
2
= 1.52[kg • cm
2
]
Ball screw
JL2 =
1
n
π • ρ • L
32
()
2
4
• D •
= 0.24[kg • cm
2
]
*ρ = 7.8 x 10
-3
[kg/cm
3
]
Gear (servo motor shaft)
JL3 =
π • ρ • L
32
4
• D
= 0.03[kg • cm
2
]
Gear (load shaft)
JL4 =
1
n
π • ρ • L
32
()
2
4
• D •
= 0.8[kg • cm
2
]
Full load inertia moment (converted into equivalent value on servo motor shaft)
JL = JL1 + JL2 + JL3 + JL4 = 1.9[kg • cm
2
]
(7) Temporary selection of servo motor
Selection conditions
1) Load torque < servo motor's rated torque
2) Full load inertia moment < 30 x servo motor inertia moment
From the above, the HC-MF23 (200W) is temporarily selected.