Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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11 OPTIONS AND PERIPHERAL EQUIPMENT
11.2 Regenerative options
337
11
Selection of the regenerative option
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
V: Feed speed of moving part [mm/min]
N: Servo motor speed (N = V/

S) [r/min]

S: Travel distance per servo motor revolution (

S = PB) [mm/rev]
P
B
: Ball screw lead [mm]
L
B
: Ball screw length [mm]
D
B
: Ball screw diameter [mm]
W
L
: Moving part mass [kg]
F
C
: Load antidrag setting [N]
T
L
: Load torque converted into equivalent value on servo motor shaft [N•m]
η : Drive system efficiency

: Friction coefficient
JL: Load moment of inertia converted into equivalent value on servo motor shaft [kg•cm
2
]
JM: Moment of inertia of the servo motor [kg•cm
2
]

: Pi constant
g: Gravitational acceleration [m/s
2
]
Servo motor
Moving part
N
V
W
L
F
C
2)
1)
V
3)
4)
Forward
rotation
6)
5) 7)
Reverse
rotation
8)
Time
Feed speed of moving part
t
psa1
t
1
t
psd1
t
2
t
psa2
t
3
t
4
t
psd2