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9. CHARACTERISTICS
9.3 Dynamic brake characteristics
Fig. 9.3 shows the pattern in which the servo motor comes to a stop when the dynamic brake is operated.
Use Equation 9.2 to calculate an approximate coasting distance to a stop. The dynamic brake time
constant t varies with the servo motor and machine operation speeds. (Refer to Fig. 9.4. Please contact us
for the servo motor not indicated.)
Vo
Lmax
60
L max : Maximum coasting distance................................................................................................ [mm][in]
V
: Machine rapid feedrate.........................................................................................[mm/min][in/min]
0
J
: Servo motor inertial moment ............................................................................... [kg cm
M
J
: Load inertia moment converted into equivalent value on servo motor shaft ... [kg cm
L
: Brake time constant........................................................................................................................[s]
t
: Delay time of control section ..........................................................................................................[s]
e
(There is internal relay delay time of about 30ms.)
0.045
0.04
0.035
0.03
0.025
0.02
0.015
0.01
0.005
0
0
If the dynamic brake is operated at more than 10 times as large as the ratio of load inertia moment to
servo motor inertia moment, the brake resistor of the dynamic brake may burn out. If the value is
exceeded, contacts us.
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ON
Emergency
stop(EMG) OFF
Machine speed
Fig 9.3 Dynamic Brake Operation Diagram
J
L
t
....................................................................................................................... (9.2)
1
e
J
M
500
1000
1500
2000
Speed
search engine
V
0
t
e
0.045
0.04
HA-LF (S) 30K2
0.035
HA-LF (S) 37K2
0.03
0.025
0.02
0.015
0.01
0.005
0
0
Fig 8.3 Dynamic Brake
9 - 4
Time constant
Time
500
1000
1500
2000
Speed
2
][oz in
2
]
2
][oz in
2
]
HA-LF (S) 45K24
HA-LF (S) 55K24
HA-LF (S) 37K24
HA-LF (S) 30K24
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