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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
Servo motor
N
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
V
F
C
W
L
Moving part
2
]
2
]
Feed speed of moving part
(2)
V
(1)
(3)
Forward
rotation
(4)
t
t
t
t
psa1
1
psd1
2
2
]
6 OPTIONS AND PERIPHERAL EQUIPMENT
(8)
Time
Reverse
rotation
(5)
(7)
(6)
t
t
t
t
psa2
3
psd2
4
6.2 Regenerative option
6
63
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