Chapter 11 Selection
11–10
11-4 Selection of regenerative resistor
The intelligent servomotor series does not have the optional regenerative resistor. (Only the standard
built-in resistor is provided.) Thus, when selecting the motor, make sure that the regenerative energy
does not exceed the capacity of the built-in regenerative resistor.
11-4-1 Limits for HS-MF23
The HS-MF23 does not have a built-in
regenerative resistor. Thus, there are limits
to the instantaneous regeneration capacity.
Avoid use in which the regeneration occurs
continuously, such as with a vertical axis.
When using the motor in the left range of
the graph on the right, there are no limits to
the regeneration frequency. When used in
the right range, an overvoltage alarm could
occur, so avoid using in this range.
11-4-2 Approximate calculation of positioning frequency
The tolerable positioning frequency for the HS-FR/HS-SF type can be approximately calculated with
expression (11-5).
To obtain the detailed value, refer to section "11-4-3 Calculating the regenerative energy" and section
"11-4-4 Calculating the positioning frequency", and calculate.
Tolerable frequency = ×
m = J
L
/J
M
.........................................................................
(11-5)
Type RF43 RF73 SF52 SF53 SF102 SF103 SF202
Tolerable frequency for
independent motor
360 195 220 100 110 50 50
11-4-3 Calculation of regenerative energy
(1) For horizontal axis
For the horizontal axis, the regenerative energy ER consumed by the regenerative resistor can be
calculated with the expression (11-6). If the ER value is negative, all of the regenerative energy is
absorbed by the capacitor on the amplifier, and the energy consumption is zero (ER = 0).
ER = 5.48 × 10
–7
· η · (JL + JM) · N
2
– Ec (J) ................................................. (11-6)
η : Motor reverse effect
JL : Motor inertia (× 10
–4
kg·cm
2
)
JM : Load inertia (× 10
–4
kg·cm
2
)
N : Motor speed (r/min)
Ec : Amplifier charging energy (J)
10 20 30 40
300
200
100
Load moment of inertia rate GDL
2
/GDm
2
Deceleration torque
[%]
Input power voltage
−−
200VAC
−−
230VAC
Tolerable frequency for independent motor
(m + 1)
Rated rotation speed
Continuous rotation speed
2
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