Dynamic Brake Operation - Mitsubishi Electric MELSERVO-J5 User Manual
Ac servo system
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Also See for MELSERVO-J5:
- User manual (580 pages) ,
- Sample screen manual (128 pages) ,
- Introduction manual (112 pages)
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Dynamic brake operation
Calculation of coasting distance
The following figure shows the pattern in which the servo motor comes to a stop when the dynamic brake is operated. Use the
equation (10.2) to calculate the approximate coasting distance to a stop. The dynamic brake time constant varies with the
servo motor and machine operation speeds.
Page 132 Dynamic brake time constant
A working part generally has a friction force. Therefore, the actual coasting distance will be shorter than the maximum
coasting distance calculated with the following equation.
ON
EM1 (Forced stop 1)
OFF
V
0
Machine speed
V
J
0
L
L
=
•
t
+ τ 1 +
∙ ∙ ∙ (10.2)
max
e
60
J
M
L
: Maximum coasting distance [mm]
max
V
: Machine's fast feed speed [mm/min]
0
J
: Moment of inertia of the servo motor [× 10
M
J
: Load moment of inertia converted into equivalent value on servo motor shaft [× 10
L
τ: Dynamic brake time constant [s]
t
: Delay time of control section [s]
e
There is an internal relay delay time of about 10 ms.
Dynamic brake
time constant τ
Time
t
e
-4
2
kg•m
]
-4
2
kg•m
]
5 CHARACTERISTICS
5.3 Dynamic brake characteristics
5
131
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