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14. SERVO MOTOR
14.7 Characteristics
14.7.1 Electromagnetic brake characteristics
CAUTION
Configure the electromagnetic brake operation circuit so that it is activated not
only by the servo amplifier signals but also by an external emergency stop signal.
Refer to Section 3.9 for details.
The electromagnetic brake is designed to hold a load. Do not use it for braking.
(1) Characteristics
Though the brake lining may rattle during operation, it poses no functional problem.
A leakage magnetic flux will occur at the shaft end of the servo motor equipped with electromagnetic
brake.
HC-SFE Series HC-KFE Series(Note 5) Servo Motor
Item
52B to 152B 202B 13B 23B 43B 73B
(Note 1)
Type Spring-loaded safety brake
(Note 4)
Rated voltage
24V
0
10%
DC
Rated current at 20 (68 ) [A] 0.8 1.4 0.26 0.33 0.42
Excitation coil resistance at
20
(68 )[]
29 16.8 9.1 73 57
Capacity [W] 19 34 6.3 7.9 9
[N m] 8.3 43.1 0.32 43.1 2.4
Static friction torque
[oz
in] 1176 6103 45 6108 340
(Note 2)
Release delay time [S] 0.04 0.1 0.03 0.1 0.03
AC off (Fig. a) 0.12 0.12 0.08 0.12 0.12
Braking delay time
(Note 2)
[s]
DC off(Fig.s b, c) 0.03 0.03 0.01 0.03 0.03
[J] 400 4500 5.6 22.0 64.0
Per
braking
[oz
in] 56683.3 637687.1 793.6 3117.6 9069.3
[J] 4000 45000 56 220 640
Permissible braking
work
Per
hour
[oz
in] 566833 6376871 7936 31176 90693
Brake looseness at servo motor shaft
(Note 5)
[degrees]
0.2 to 0.6 0.2 to 0.6 0.19 to 2.5 0.12 to 1.2 0.1 to 0.9
Number of braking
cycles [times]
20000 20000 20000 20000 20000
[J] 200 1000 4 15 32
Brake life
(Note 3)
Work per
braking
[oz
in] 28342 141708 567 2124.18 4535
Note:1. There is no manual release mechanism. When it is necessary to hand-turn the servo motor shaft for machine centering,
etc., use a separate 24VDC power supply to release the brake electrically.
2. The value for initial ON gap at 20
(68 ).
3. The brake gap will increase as the brake lining wears, but the gap is not adjustable. The brake life indicated is the
number of braking cycles after which adjustment will be required.
4. 24VDC of the power output for interface (VDD) cannot be used. Always use a separate power supply.
5. The above values are typical initial values and not guaranteed values.