4-53
4-4 Regenerative Energy Absorption
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
4
System Design
4-4 Regenerative Energy Absorption
A Servo Drive uses its built-in capacitors to absorb the regenerative energy produced during
motor deceleration. If the amount of regenerative energy is too much for the built-in capacitors
to absorb, it also uses an Internal Regeneration Resistor. An overvoltage error occurs,
however, if the amount of regenerative energy from the Servomotor is too large. If this occurs,
reduce the regenerative energy by changing operating patterns or increase the regeneration
process capacity by connecting External Regeneration Units.
Precautions for Correct Use
Some Servo Drive models do not have any built-in Internal Regeneration Resistor.
The regeneration absorption capacity of a Servo Drive varies depending on the Servo Drive
model.
For information on whether or not your Servo Drive has an Internal Regeneration Resistor
and its regeneration absorption capacity, refer to Servo Drive Regeneration Absorption
Capacity (P.4-56).
Regenerative Energy Calculation
The method for calculating regenerative energy on the horizontal axis is indicated below.
In the output torque graph, acceleration in the forward direction is shown as positive, and
acceleration in the reverse direction is shown as negative.
The regenerative energy values in each region can be derived from the following equations.
Note. Due to the loss of motor winding resistance and PWM, the actual regenerative energy will be
approx. 90% of the values derived from these equations.
Motor operation
Motor output torque
+N1
−N2
TD1
TD2
t 1 t 2
T
E
g1Eg1
Eg2Eg2
N
1
,
N
2
: Rotation speed at start of deceleration [r/min]
: Deceleration torque [N·m]
: Deceleration time [s]
T
D1
,
T
D2
t
1
,
t
2
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