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

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14 - 2
14. OPTIONS AND AUXILIARY EQUIPMENT
b) To make selection according to regenerative energy
Use the following method when regeneration occurs continuously in vertical motion applications or
when it is desired to make an in-depth selection of the regenerative brake option:
1) Regenerative energy calculation
Use the following table to calculate the regenerative energy.
M
Friction
torque
U
nb
al
an
ce
to
rq
ue
T
F
T
U
S
er
vo
m
ot
or
s
pe
ed
G
en
er
at
e
d
to
rq
u
e
Time
Up
No
tf(1 cycle)
Down
( )
( )
(Driving)
(Regenerative)
T
psd2
t2 t3 t4 t1
T
psa2
T
psd1
T
psa1
1)
2)
3)
4)
5)
6)
7)
8)
Formulas for Calculating Torque and Energy in Operation
Regenerative Power Torque applied to servo motor [N m] Energy [J]
1)
T
1
(J
L
J
M
)
9.55 10
4
No
1
Tp
sa1
T
U
T
F
E
1
2
0.1047
No T
1
Tp
sa1
2) T
2
= T
U
+ T
F
E
2
= 0.1047 No T
2
t
1
3)
T
3
(J
L
J
M
)
9.55 10
4
No
1
Tp
sd1
T
U
T
F
E
3
2
0.1047
No T
3
Tp
sd1
4), 8) T
4
= T
U
E
4
0 (No regeneration)
5)
T
5
(J
L
J
M
)
9.55 10
4
No
1
Tp
sa2
T
U
T
F
E
5
2
0.1047
No T
5
Tp
sa2
6) T
6
= T
U
T
F
E
6
= 0.1047 No T
6
t
3
7)
(J
L
J
M
)
9.55 10
4
No
T
7
1
Tp
sd2
T
U
T
F
E
7
2
0.1047
No T
7
Tp
sd2
From the calculation results in 1) to 8), find the absolute value (Es) of the sum total of negative
energies.
2) Losses of servo motor and servo amplifier in regenerative mode
The following table lists the efficiencies and other data of the servo motor and servo amplifier in
the regenerative mode.
Servo Amplifier Inverse Efficiency[%] Capacitor Charging[J]
MR-J2-10C 55 9
MR-J2-20C 70 9
MR-J2-40C 85 11
MR-J2-60C 85 11
MR-J2-70C 80 18
MR-J2-100C 80 18
MR-J2-200C 85 40
MR-J2-350C 85 40
Inverse efficiency ( ) :Efficiency including some efficiencies of the servo motor and servo amplifier
when rated (regenerative) torque is generated at rated speed. Since the
efficiency varies with the speed and generated torque, allow for about 10%.
Capacitor charging (Ec) :Energy charged into the electrolytic capacitor in the servo amplifier.
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