5.2 SERVOPACK Models with a Built-In Dynamic Brake
5.2.2 Selecting the Dynamic Brake Resistor
5-6
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
50.0
100.0
150.0
200.0
250.0
300.0
350.0
0
200
400
600
800
1000
1200
Dynamic Brake Resistance
(
Ω
)
SGD7S-1R9D
SGLFW-35D230A
SGLFW2-30D230A
SGLFW-35D120A
SGLFW2-30D120A
SGLFW2-30D070A
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
450.0
500.0
0
200
400
600
800
1000
1200
Dynamic Brake Resistance
(
Ω
)
SGD7S-3R5D
SGLTW-50D170H
SGLFW2-45D200A
SGLFW-50D200B
SGLTW-35D170H
0.0
100.0
200.0
300.0
400.0
500.0
600.0
700.0
0
100
200
300
400
500
600
700
800
Dynamic Brake Resistance
(
Ω
)
SGD7S-5R4D
SGLFW2-90D200A
SGLFW-50D380B
SGLFW-1ZD200B
0.0
100.0
200.0
300.0
400.0
500.0
600.0
700.0
800.0
900.0
1,000.0
0
50
100
150
200
250
300
350
Dynamic Brake Resistance
(
Ω
)
SGD7S-8R4D
SGLTW-50D320H
SGLFW2-45D380A
SGLTW-35D320H
0.0
200.0
400.0
600.0
800.0
1,000.0
1,200.0
1,400.0
0
50
100
150
200
250
300
350
Dynamic Brake Resistance
(
Ω
)
SGD7S-120D
SGLFW2-90D380A
SGLTW-40D400B
SGLFW-1ZD380B
0.0
200.0
400.0
600.0
800.0
1,000.0
1,200.0
1,400.0
1,600.0
1,800.0
2,000.0
0
50
100
150
200
250
Dynamic Brake Resistance
(
Ω
)
SGD7S-170D
SGLTW-80D400B
SGLFW2-1DD560A,
SGLFW2-90D560A
SGLTW-40D600B
Instantaneous Maximum
Dynamic Brake For
ce (N
)
Instantaneous Maximum
Dynamic Brake For
ce (N
)
Instantaneous Maximum
Dynamic Brake For
ce (N
)
Instantaneous Maximum
Dynamic Brake For
ce (N
)
Instantaneous Maximum
Dynamic Brake For
ce (N
)
Instantaneous Maximum
Dynamic Brake For
ce (N
)