5.3 SERVOPACK Models without a Built-In Dynamic Brake
5.3.2 Selecting the Devices Required for the Dynamic Brake Circuit
5-13
5
W
iring and Settings for the Dynamic Brake
Rotary Servomotors
Linear Servomotors
Energy Consumption of the Dynamic Brake Resistor
Calculate the energy consumption required to stop the Servomotor using the Dynamic Brake
Resistor.
To simplify the calculation of energy consumption, assume that all kinetic energy until the Ser-
vomotor stops is consumed by the Dynamic Brake Resistor and calculate energy consumption
with the following formula.
Calculate energy consumption at the maximum value of kinetic energy of the Servomotor out of
all anticipated operation patterns.
Rotary Servomotors
Energy consumption of Dynamic Brake Resistor:
E
DB
[J]
Motor moment of inertia:
J
M
[kg
m
2
]
Load moment of inertia:
J
L
[kg
m
2
]
Motor speed before dynamic braking: N [min
-1
]
E
DB
= 1/2
×
(
J
M
+
J
L
)
×
(2
π
N/60)
2
Note: Refer to the catalog or product manual of the Servomotor for details on the motor moment of inertia.
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
0
5
10
15
20
25
30
35
40
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0
180.0
0
5
10
15
20
25
30
35
40
0.0
10.0
20.0
30.0
40.0
50.0
60.0
0
5
10
15
20
25
30
35
40
SGD7S-210D
SGM7G-55D
F
SGM7G-44D
R
SGD7S-260D
SGD7S-280D
0
5
10
15
20
25
30
35
40
SGM7G-1AD
F
SGD7S-370D
SGM7G-1ED
F
SGM7G-75D
F
SGM7A-70D
F
Instantaneous Maximum
Dynamic Brake T
or
que (N
·m
)
Instantaneous Maximum
Dynamic Brake T
or
que (N
·m
)
Instantaneous Maximum
Dynamic Brake T
or
que (
N·m)
Instantaneous Maximum
Dynamic Brake T
or
que (
N·m)
Dynamic Brake Resistance
(
Ω
)
Dynamic Brake Resistance
(
Ω
)
Dynamic Brake Resistance
(
Ω
)
Dynamic Brake Resistance
(
Ω
)
0.0
500.0
1,000.0
1,500.0
2,000.0
2,500.0
3,000.0
0
5
10
15
20
25
30
35
40
Dynamic Brake Resistance
(
Ω
)
SGD7S-260D
SGLFW-1DD560A
SGLTW-80D600B
Instantaneous Maximum
Dynamic Brake For
ce (N
)
