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
N01
Tpsa1 TUTFE12
0.1047 N0T1Tpsa1
2) T2 TU TFE2 0.1047 N0T2t1
3) T3(JL JM)
9.55 104
N01
Tpsd1 TUTFE32
0.1047 N0T3Tpsd1
4), 8) T4 TUE40 (No regeneration )
5) T5(JL JM)
9.55 104
N01
Tpsa2 TUTFE52
0.1047 N0T5Tpsa2
6) T6 TU TFE6 0.1047 N0T6t3
7) T7(JL JM)
9.55 104
N01
Tpsd2 TUTFE72
0.1047 N0T7Tpsd2
From the calculation results in 1) to 8), find the absolute value (Es) of the sum total of neg ativeenergies.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-E-10A(1) 55 9

MR-E-20A(1) 70 9

MR-E-40A(1) 85 11

MR-E-70A 80 18

MR-E-100A 80 18

MR-E-200A 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 torque, allow for about 10%.Capacitor charging (Ec) :Energy charged into the electrolytic capacitor in the servo amplif ier.