Table of Contents
Advertisement
Diagram below shows the acceleration and deceleration cycle periods and the
regenerative torque that occurs during the process.
Rotational
velocity
0
Motor
Torque
0
Steps to calculate capacity of regenerative resistor
Steps
Calculation
Servo system regenerative
1
Depleted energy from loss of
2
load system during
acceleration
Depleted energy due to motor
3
coil resistance.
Energy stored by internal DC
4
capacitors
Depleted energy due to
5
regenerative resistance
Required power rating of
6
regenerative resistor
EL8-EC Drivers
400W
ACM2-06004H2
750W
ACM2-08008H2
ACM8010M2
1000W
ACM13010M2
There are motors with low, medium and high inertia. Different motor models have different
rotor inertia. Please refer to product catalogue for more information on rotor inertia.
Calculation examples:
V:Motor rotational velocity
T
: Load torque
L
energy
Internal capacitor capacity and rotor inertia
Servo motor
User manual of EL8-EC***F AC Servo
t
:Deceleration
D
time
Regenerative
torque
T
Symbol
E1
E1=(N+1)×J×V
E
L
E
L
If loss is not determined, please assume E
E
R= coil resistance, U = operating voltage
M
If R is not determined, please assume E
Ec
Please refer to table 2-5
E
K
E
K
If loss is ignored, EK=E1-EC
Pr
Rotor Inertia
-4
2
（× 10
）
kg.m
0.58
1.66
1.79
8.5
Formula
2
/182
= (π/60) V×T
×tD
L
2
E
=(U
/R)×tD
M
=E1-(EL+EM+EC),
Pr=E
/(0.5×T)
K
Max. regenerative energy
stored in capacitor Ec(J)
13.47
22.85
27.74
= 0.
L
= 0.
M
48
Advertisement
Table of Contents
