11. OPTIONS AND AUXILIARY EQUIPMENT
11 - 7
(b) 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 [%]
C charge [J] Servo amplifier
Inverse
efficiency [%]
C charge [J]
MR-J4-10A 55 9 MR-J4-100A 85 18
MR-J4-20A 75 9 MR-J4-200A 85 36
MR-J4-40A 85 11 MR-J4-350A 85 40
MR-J4-60A 85 11 MR-J4-500A 90 45
MR-J4-70A 85 18 MR-J4-700A 90 70
Inverse efficiency (Ș): 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
Subtract the capacitor charging from the result of multiplying the sum total of regenerative energies
by the inverse efficiency to calculate the energy consumed by the regenerative option.
ER[J] = Ș • Es - Ec
Calculate the power consumption of the regenerative option on the basis of single-cycle operation
period tf [s] to select the necessary regenerative option.
PR[W] = ER/tf
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