Chapter 4 Characteristics
4–3
4-1-2 Magnetic brake characteristics
Table 4-1 Magnetic brake characteristics
HC
∗∗
∗∗
∗∗
∗∗
Series
HC
∗∗
∗∗
∗∗
∗∗
R Series
Motor type
Item
52B to 152B
53B to 153B
202B to 902B
203B to 703B
103RB to 203RB
353RB to 503RB
Type (Note 1)
Spring braking type safety brakes
Rated voltage
24 VDC
Rated current at 20
°
C (A)
0.80
1.43
0.80
0.96
Excitation coil resistance at 20
°
C (
Ω
)
29
16.8
30
25
Capacity (W)
19
34
19
23
Attraction current
(A)
0.2
0.4
0.25
0.24
Dropping current
(A)
0.08
0.2
0.085
0.10
(N·m)
8.3
43.1
6.8
16.7
Static friction torque
(kgf·cm)
85.0
440
70.0
170
(kg·cm
2
)
2.0
10
0.4
3.5
J
(kgf·cm·sec
2
)
0.002
0.0102
0.0004
0.0036
Moment of inertia
(Note 2)
GD
2
(kgf·cm
2
)
8.0
40
1.6
14
Release delay time (Note 3)
(sec)
0.04
0.1
0.03
0.04
AC OFF (sec)
0.12
0.12
0.12
0.12
Braking delay time (sec)
(Note 3)
DC OFF (sec)
0.03
0.03
0.03
0.03
(N·m)
400
4,500
400
400
Per braking
(kgf·cm)
4,082
46,000
4,082
4,082
(N·m)
4,000
45,000
4,000
4,000
Tolerable
braking
work
amount
Per hour
(kgf·cm)
40,816
460,000
40,816
40,816
Brake play at motor axis (deg.)
0.2 ~ 0.6
0.2 ~ 0.6
0.2 ~ 0.6
0.2 ~ 0.6
No. of braking operations (times)
20,000
20,000
20,000
20,000
(N·m)
200
1,000
200
200
Brake life
(Note 4)
Braking amount
per braking
(kgf·cm)
2,041
10,204
2,041
2,041
Notes:
1. There is no manual release mechanism. If handling is required such as during the machine core alignment
work, prepare a separate 24 VDC power supply, and electrically release the brakes.
2. These are the values added to the servomotor without brakes.
3. This is the value for 20
°
C at the initial attraction gap.
4. The brake gap will widen through brake lining wear caused by braking. However, the gap cannot be adjusted.
Thus, the brake life is reached when adjustments are required.
5. The internal power output (CN3: VDD) 24VDC for the MDS-B-SVJ2 servo amplifier's digital output cannot be
used. Always prepare a separate power supply.
6. A leakage flux will be generated at the shaft end of the servomotor with magnetic brakes.
7. When operating in low speed regions, the sound of loose brake lining may be heard. However, this is not a
problem in terms of function.
