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13. CHARACTERISTICS
13.3 Dynamic brake characteristics
Fig. 13.3 shows the pattern in which the servo motor comes to a stop when the dynamic brake is operated.
Use Equation 13.2 to calculate an approximate coasting distance to a stop. The dynamic brake time
constant varies with the servo motor and machine operation speeds. (Refer to Fig. 13.6 and Table 13.2.)
Vo
Lmax
60
L max : Maximum coasting distance .......................................................................................................[mm][in]
Vo
: Machine rapid feedrate ............................................................................................... [mm/min][in/min]
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 (Fig. 13.6 Table 13.2) ......................................................................................... [s]
te
: Delay time of control section (Fig. 13.5) .............................................................................................. [s]
(There is internal relay delay time of about 30ms.)
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ON
Emergency stop(EMG)
OFF
Machine speed
Fig. 13.5 Dynamic Brake Operation Diagram
J
L
t
1
e
.........................................................................................................................(13.2)
J
M
search engine
Time constant
V
0
t
e
13 - 5
Time
][oz in
2
][oz in
2
]
2
]
2
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