Fuji Electric ALPHA7, User Manual

Page: 658 / 662

CHAPTER 16 APPENDIXES
Capacity Selection Calculation
31
16
[4] Calculate the energy (E
S
) that can be absorbed by the servo amplifier.

DC link capacity (RYT201): 440 [μF], source voltage 200 [V] (actual value)

The capacitor of 0.2 [kW] or smaller capacity servo amplifiers is 440 [μF].

V
DB
: DB transistor activation level (390 [V]). V
DC
: DC link voltage
(200 x √2 [V])
The energy that can be processed by the mechanical system, servo amplifier and servomotor is:
E
L
+ E
M
+ E
S
= 0.24 + 1.2 + 15.86 ≈ 17.3 [J]
Because E
G
= 6.1 [J], no external regenerative resistor is necessary.
1
2
Ｃ（Ｖ
DB
２
－Ｖ
DC
２
） Ｅ
Ｓ
＝
＝
15.86 [J]
1
2
（ 440 × 10
－６
）×（ 390
２
－（ 200 ×√ 2 ）
２
） ＝