3. Characteristics
3 - 9
(2) Magnetic brake characteristics
Motor type
Item
HF75B, HF105B,
HF54B, HF104B,
HF154B, HF224B,
HF123B, HF223B,
HF142B
HF204B, HF354B,
HF303B, HF302B
Type (Note 1)
Spring closed non-exciting operation magnetic brakes
(for maintenance and emergency braking)
Rated voltage DC24V
Rated current at 20°C （A）
0.38
0.8 1.4
Capacity （W） 9 19 34
Static friction torque （N･m） 2.4 8.3 43.1
Inertia (Note 2) （kg･cm
2
） 0.2 2.2 9.6
Release delay time (Note 3) （s） 0.03 0.04 0.1
Braking delay
time (Note 3)
DC OFF
（s） 0.03 0.03 0.03
Per braking （J） 64 400 4500 Tolerable
braking work
amount
Per hour
（J） 640 4000 45000
Brake play at motor axis
(Note 7)
（degree） 0.1～0.9 0.2～0.6 0.2～0.6
No. of braking
operations
（times） 20000 20000 20000
Brake life
(Note 4)
Work amount
per braking
（J） 32 200 1000
Notes:
1. There is no manual release mechanism. If handling is required such as during the machine core
alignment work, prepare a separate 24VDC power supply, and electrically release a brake.
2. These are the values added to the servomotor without a brake.
3. This is the representative value for the initial attraction gap at 20C.
4. The brake gap will widen through brake lining wear caused by braking. However, the gap cannot
be adjusted. Thus, the brake life is considered to be reached when adjustments are required.
5. A leakage flux will be generated at the shaft end of the servomotor with a magnetic brake.
6. 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.
7. This is the main default value, and is not a guaranteed value.
