Mitsubishi Electronics MDS-D-SPJ3 ユーザーズマニュアル

7 - 15

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.

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)

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)

9

18

11

40

18

40

30

45

40

45

40

90

0.85

0.90

0.85

0.85

0.55

0.70

0.85

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)

･

･