Selection Of The Regenerative Option [Wg] - Mitsubishi Electric MR-J5 Series User Manual

Selection of the regenerative option [WG]

A regenerative option for a horizontal axis can be selected with the rough calculation shown in this section. To select a
regenerative option precisely, use the capacity selection software.
Rotary servo motor
■Regenerative energy calculation
Servo motor
V: Feed speed of moving part [mm/min]
N: Servo motor speed (N = V/ΔS) [r/min]
ΔS: Travel distance per servo motor revolution (ΔS = PB) [mm/rev]
P : Ball screw lead [mm]
B
L : Ball screw length [mm]
B
D : Ball screw diameter [mm]
B
W : Moving part mass [kg]
L
F : Load antidrag setting [N]
C
T : Load torque converted into equivalent value on servo motor shaft [N•m]
L
η: Drive system efficiency
μ: Friction coefficient
JL: Load moment of inertia converted into equivalent value on servo motor shaft [kg•cm
JM: Moment of inertia of the servo motor [kg•cm
π: Pi constant
g: Gravitational acceleration [m/s
6 OPTIONS AND PERIPHERAL EQUIPMENT
140
6.2 Regenerative option
V
N
W
L
Moving part
2
]
2
]
Feed speed of moving part
V
F
C
1)
Forward
rotation
t
psa1
2)
3)
4)
Reverse
rotation
5)
6)
t t t t t
1 psd1 2 psa2 3
2
]
8)
Time
7)
t t
psd2 4