Mitsubishi Electric MELSERVO MR-J2 C Series, Инструкция по эксплуатации

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13 - 5
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.)
V
0
Time constant
Emergency stop(EMG)
OFF
ON
Machine speed
t
e
Time
Fig. 13.5 Dynamic Brake Operation Diagram
Lmax
60
Vo
J
L
J
M
t
e
1
.........................................................................................................................(13.2)
L max : Maximum coasting distance .......................................................................................................[mm][in]
Vo
: Machine rapid feedrate ...............................................................................................[mm/min][in/min]
J
M
: Servo motor inertial moment.......................................................................................[kg cm
2
][oz in
2
]
J
L
: Load inertia moment converted into equivalent value on servo motor shaft ........... [kg cm
2
][oz in
2
]
: 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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