Instruction manual

App - 5
A
PPENDI
X
5) Determination of linear servo motor selected.
Frms/
REM Continuous thrust [N] of temporarily selected motor
Frms/
REM Max. thrust [N] of temporarily selected motor
When the above equation is not satisfied after determination, increase the capacity of linear servo motor by
one and calculate again.
(3) Number selection of secondary side (magnets)
Select number of the secondary side (magnets) by the combination with which the following equation is
satisfied.
(Total length of which secondary side (magnet) are set out)
(Max. feed distance) + (Length of primary
side (coil))
Allowance
length
Primary side (coil)
Primary side (coil)
Max. feed distance
1/2 of primary side (coil) length
1/2 of primary side (coil) length
Minimum required distance of secondary side (magnet)
Secondary side (magnet)
(4) Selection of regenerative brake option
The following table shows the energy that can be absorbed in the capacitor within the servo amplifier and
the inverse efficiency of the linear servo motor.
Regenerative Power [W]
Servo amplifier
MR-J3-
-RJ004
Capa
citor
charg
ing
[J]
Inverse
efficien
cy [%]
Built-in
regenerati
ve brake
resistor
MR-
RB032
[40
]
MR-RB12
[40
]
MR-RB30
[13 ]
MR-RB31
[6.7 ]
MR-RB32
[40 ]
(Note)
MR-RB50
[13
]
(Note)
MR-MB51
[6.7
]
40B 11 85 10 30 100
70B 18 80 20 30 100 300
200B 40 85 100 300 500
350B 40 85 100 300 500
500B 45 90 130 300 500
Note. Make sure to install a cooling fan.
The energy used by the regenerative brake resistor can be calculated by subtracting losses from the
deceleration time thrust which has been calculated to select the linear servo motor.
Regenerative energy P (W) = (–Fmd
t
3
(Speed/2) (Inverse efficiency/100) – Capacitor charging)/t
0
Select the regenerative brake option as necessary so that the used energy becomes less than the
regenerative power.