13 - 2
13. OPTIONS AND AUXILIARY EQUIPMENT
(b) To make selection according to regenerative energyUse the following method when regeneration occurs continuously in vertical motion applications orwhen it is desired to make an in-depth selection of the regenerative brake option:a. Regenerative energy calculationUse the following table to calculate the regenerative energy.
M
Friction
torque

Unbalance torque

TF
TU

Servo motor speed

Generated torque

Time
Up
No
tf(1 cycle)
Down
( )
( )
(Driving)
(Regenerative)
Tpsd2
t2 t3 t4t1
Tpsa2
Tpsd1
Tpsa1
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) T1(JL JM)
9.55 104
No 1
Tpsa1 TUTFE12
0.1047 No T1Tpsa1
2) T2 TU TFE2 0.1047 No T2t1
3) T3(JL JM)
9.55 104
No 1
Tpsd1 TUTFE32
0.1047 No T3Tpsd1
4), 8) T4 TUE40 (No regeneration)
5) T5(JL JM)
9.55 104
No 1
Tpsa2 TUTFE52
0.1047 No T5Tpsa2
6) T6 TU TFE6 0.1047 No T6t3
7) T7(JL JM)
9.55 104
No 1
Tpsd2 TUTFE72
0.1047 No T7Tpsd2

Sum total of regenerative energies Sum total of negative energies in 1) to 8)

b. Losses of servo motor and servo amplifier in regenerative modeThe following table lists the efficiencies and other data of the servo motor and servo amplifier inthe regenerative mode.

Servo amplifier Inverse efficiency[%] Capacitor charging[J]

MR-J2S-10A(1) 55 9

MR-J2S-20A(1) 70 9

MR-J2S-40A(1) 85 11

MR-J2S-60A 85 11

MR-J2S-70A 80 18

MR-J2S-100A 80 18

MR-J2S-200A 85 40

MR-J2S-350A 85 40

Inverse efficiency ( ) :Efficiency including some efficiencies of the servo motor and servoamplifier when rated (regenerative) torque is generated at rated speed.Since the efficiency varies with the speed and generated torque, allow forabout 10%.Capacitor charging (Ec) :Energy charged into the electrolytic capacitor in the servo amplifier.