Mitsubishi Electric MR-J4W2-0303B6, Instruction Manual

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11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 9
(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
energy Ec [J]
MR-J4W2-22B 75 17
MR-J4W2-44B 85 21
MR-J4W2-77B 85 44
MR-J4W2-1010B 85
44
MR-J4W3-222B 75 21
MR-J4W3-444B 85 31
Inverse efficiency ( η
m
): Efficiency including some efficiencies of the servo motor and servo amplifier
when rated (regenerative) torque is generated at rated speed. Efficiency varies
with the speed and generated torque. Since the characteristics of the electrolytic
capacitor change with time, allow for approximately 10% higher inverse
efficiency.
Capacitor charging energy (Ec): Energy charged into the electrolytic capacitor in the servo amplifier
(3) Calculation of regenerative energy per cycle
For example, calculate the regenerative energy in the following operation pattern with 3-axis servo
amplifier.
2) 1)
A-axis
B-axis
C-axis
3) 4) 6) 5) 7) 8) 9)
10)
11)
Time
Time
Time
Servo motor speed
Linear servo motor feed speed
tf (1 cycle)