5.6 Selecting a Regenerative Resistor
5 -87
Note 1.
The “0.2” in the equation for calculating W
K
is the value for when the regenerative
resistor’s utilized load ratio is 20%.
2. The units for the various symbols are as follows:
E
S
to E
K
:
Energy joules (J)
T
L
:
Load torque (N·m) (oz·in)
W
K
:
Regenerative resistor required capacity (W) t
D
:
Deceleration stopping time (s)
J
:(
= J
M
+ J
L
)(
kg·m
2
)
(oz·in·s
2
)
T
:
Servomotor repeat operation period (s)
N
M
:
Rotation speed used by Servomotor (r/min)
If the above calculation determines that the amount of regenerative power (Wk) that can be pro-
cessed by the built-in resistor is not exceeded, then an external regenerative resistor is not re-
quired.
If the amount of regenerative power that can be processed by the built-in resistor is exceeded,
theninstallanexternalregenerativeresistorforthecapacityobtainedfromtheabovecalculation.
If the energy consumed by load system loss (in step 2 above) is unknown, then perform the cal-
culation using E
L
= 0.
When the operation period in regeneration mode is continuous, add the following items to the
above calculation procedure in order to find the required capacity (W) for the regenerative resis-
tor.
D
Energy for continuous regeneration mode operation period: E
G
(joules)
D
Energy consumed by regenerative resistor: E
K
= E
S
-- (E
L
+ E
M
+ E
C
) + E
G
D
Required capacity of regenerative resistor: W
K
= E
K
/ (0.2
¢
T)
Here, E
G
= (2
p
/60) N
MG
T
G
t
G
D
T
G
:
Servomotor’sgeneratedtorque(N·m)(oz·in)incontinuousregenerationmodeoperation
period
D
N
MG
:
Servomotor rotation speed (r/min) for same operation period as above
D
t
G
:
Same operation period (s) as above
Servomotor Winding Resistance Loss
The following diagrams show the relationship, for each Servomotor, between the Servomotor’s
generated torque and the winding resistance loss.
1.
Servomotor for 100 V
SS
SGMAH Servomotor, 100 V
SS
SGMPH Servomotor, 100 V
A3B
A5B
02B
01B
SGMAH-
(W)
Torque (%)
100
200
300
0
0
20
100
200
180
160
140
120
40
60
80
Loss
01B
02B
SGMPH-
(W)
Torque (%)
100
200
300
0
0
20
100
160
140
120
40
60
80
Loss
5
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