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MDS-D-SVJ3/SPJ3 Series Specifications Manual
7-3 Selection of the regenerative resistor
7-3-2 Calculation of the regenerative energy
Calculate the regenerative energy for stopping from each axis' rapid traverse rate (maximum rotation speed
for spindle), and select a regenerative resistor having a capacity that satisfies the positioning frequency
determined from the machine specifications.
(1) For horizontal servo axis and spindle
The regenerative energy E
R
consumed by the regenerative resistor can be calculated from expression (7-
13). If the E
R
value is negative, all of the regenerative energy is absorbed by the capacitor in the drive unit
(capacitor regeneration), and the energy consumed by the regenerative resistor is zero (E
R
= 0).
••• (7-13)
(Example)When a load with the same inertia as the motor is connected to the HF54, determine the
regenerative energy to stop from the rated rotation speed. Note that the drive unit is MDS-D-SVJ3-07NA in
this case.
According to expression (7-13), the regenerative energy E
R
is:
E
R
=5.48×10
-7
×0.85×(6.1+6.1)×3000
2
-18 =33.1(J)
Drive unit charging energy
Motor reverse efficiency
η :Motor reverse efficiency
J
L
:Motor inertia
(kg•cm
2
)
J
M
:Load inertia
(kg•cm
2
)
N :Motor speed (r/min)
Ec :Unit charging energy (J)
Drive unit Charging energy Ec (J) Drive unit Charging energy Ec(J)
MDS-D-SVJ3-03NA 9 MDS-D-SPJ3-075NA 18
MDS-D-SVJ3-04NA 11 MDS-D-SPJ3-22NA 40
MDS-D-SVJ3-07NA 18 MDS-D-SPJ3-37NA 40
MDS-D-SVJ3-10NA 30 MDS-D-SPJ3-55NA 45
MDS-D-SVJ3-20NA 40 MDS-D-SPJ3-75NA 45
MDS-D-SVJ3-35NA 40 MDS-D-SPJ3-110NA 90
Motor
Motor reverse
efficiency η
Motor
Motor reverse
efficiency η
HF75,105 0.85 All spindle motors 0.90
HF54, 104, 154, 224, 123, 223, 142 0.85
HF204, 354, 303, 302 0.85
HF-KP13 0.55
HF-KP23 0.70
HF-KP43 0.85
HF-KP73 0.85
The charging energy values apply when the unit input power voltage is 220V. If the input voltage is
higher, the charging energy decreases, and the regenerative energy increases.
E
R
䋽 5.48× 10
-7
(J
L
䋫J
M
)䍃N
2
䋭Ec
(J)
POINT