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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) 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 (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.