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Appendix 8 Old motor specifications 
 
 
 
 
 
A8 - 19
Appendix 8-6  Magnetic brake characteristics 
 
Motor model
 
 
Item 
HF44B 
HF74B 
HF53B 
HF103B 
HF153B 
HF203B 
HF353B 
Type (Note 1) 
Spring braking type safety brakes 
Rated voltage 
24VDC 
Rated current at 20°C 
(A) 
0.38 
0.8 
1.4 
Capacity (W) 
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 
(degree) 
0.1 to 0.9 
0.2 to 0.6 
0.2 to 0.6 
No. of braking 
operations 
(times) 
20,000 20,000 20,000 
Brake life 
(Note 4) 
Work amount 
per braking 
(J) 32 200 
1000 
 
(Note 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. 
(Note 2) These are the values added to the servomotor without a brake. 
(Note 3) This is the representative value for the initial attraction gap at 20°C. 
(Note 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. 
(Note 5) A leakage flux will be generated at the shaft end of the servomotor with a magnetic brake
(Note 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. 
(Note 7) This is the main default value, and is not a guaranteed value.