
B-65232EN/03 DESCRIPTIONS FOR FANUC AC SERVO MOTOR β series 8.BUILT-IN BRAKE
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8.1 BRAKE SPECIFICATIONS
The specifications of built-in brakes for βM series servo motors are
listed below.
Item Unit
β
ββ
βM0.2/4000
β
ββ
βM0.3/4000
β
ββ
βM0.4/4000
β
ββ
βM0.5/4000
β
ββ
βM1/4000
Brake torque
Nm
kgf⋅cm
0.32
3.3
0.65
6.6
1.2
12
Release msec 40 40 40
Response
time
Brake msec 20 20 20
V (±10%) 24 VDC
Supply voltage
Current
A 0.3 or lower 0.5 or lower 0.5 or lower
Weight increase kgf Approx. 0.22 Approx. 0.4 Approx. 0.4
Inertia increase
kgm
2
kgfcms
2
2×10
-6
2×10
-5
9×10
-6
9×10
-5
9×10
-6
9×10
-5
The values specified above are standard values at 20°C.
The specifications of built-in brakes for β series servo motors are
listed below.
Item Unit
β
ββ
β1/3000
β
ββ
β2/3000
β
ββ
β3/3000
β
ββ
β6/2000
Brake torque
Nm
kgf⋅cm
2
20
8
82
Release msec 60 70
Response
time
Brake msec 20 30
V (±10%) 90 VDC
Supply voltage
Current
A 0.3 or lower 0.4 or lower
Weight increase kgf Approx. 1.5 Approx. 2.3
Inertia increase
kgm
2
kgfcms
2
2×10
-5
2×10
-4
7×10
-5
7×10
-4
The values specified above are standard values at 20°C.
CAUTION
The built-in brake is used as a holding brake to
prevent axis dropping at servo-off time. Though the
built-in brake functions as braking in the case of an
emergency stop or power outage, however, the
built-in brake cannot be used to brake and shorten
the stop distance at ordinary deceleration time.
Moreover, while the motor is excited, the built-in
brake cannot be used as an auxiliary mechanism
for holding the motor.