YASKAWA SGD7S-xxxDA0 series Product Manual page 128

 Rotary Servomotors
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0 5 10 15
Dynamic Brake Resistance
140.0
120.0
100.0
80.0
60.0
40.0
20.0
0.0
0 5 10 15
Dynamic Brake Resistance
 Linear Servomotors
3,000.0
2,500.0
2,000.0
1,500.0
1,000.0
500.0
0.0
0 5 10 15
Dynamic Brake Resistance
 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:
Motor moment of inertia:
Load moment of inertia:
Motor speed before dynamic braking: N [min
= 1/2 × ( ) × (2πN/60)
+
E J J
DB M L
Note: Refer to the catalog or product manual of the Servomotor for details on the motor moment of inertia.
5.3 SERVOPACK Models without a Built-In Dynamic Brake
5.3.2 Selecting the Devices Required for the Dynamic Brake Circuit
SGD7S-210D
SGM7G-55D F
SGM7G-44D R
20 25 30 35 40
(Ω)
SGD7S-280D
SGM7G-1AD F
20 25 30 35 40
(Ω)
SGD7S-260D
SGLFW-1DD560A
SGLTW-80D600B
20 25 30 35 40
(Ω)
2

[kg m ]
J
M
2

[kg m ]
J
L
-1
]
2
SGD7S-260D
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0 5 10 15
Dynamic Brake Resistance
SGD7S-370D
180.0
160.0
140.0
SGM7G-1ED F
120.0
100.0
80.0
60.0
40.0
20.0
0.0
0 5 10 15
Dynamic Brake Resistance
[J]
E
DB
SGM7G-75D F
SGM7A-70D F
20 25 30 35 40
(Ω)
20 25 30 35 40
(Ω)
5-13
5