Fuji Electric ALPHA7, Руководство пользователя

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CHAPTER 16 APPENDIXES
26
Capacity Selection Calculation
16
(8) Calculating the regenerative power
Regenerative operation is caused in general in the following state.
Horizontal feed: During deceleration
Vertical feed: During constant speed feed in the lowering cycle and during deceleration
Regenerative power during deceleration (P
1
)
Ｐ
１
[W]
＝ （
2π
／
60
）
×
Ｔ
ＤＣ
[Nm] ×
Ｎ
１
[r/min] ×
（
1
／
2
）
Constant speed feed in lowering cycle (P
2
)
Ｐ
２
[W]
＝ （
2
π／
60
）×Ｔ
ＤＣ
[Nm]
×Ｎ
１
[r/min]
Calculate the average regenerative power (P) of each cycle of the operation pattern to check if P is
within the regenerative resistor capacity. If it is not, an external regenerative resistor is necessary.
(9) Reviewing the operation pattern and mechanical configuration
If T
rms
exceeds TR, review the following items.

Increase the acceleration/deceleration time a little in the allowable range.

Reduce the operation frequency (increase the cycle time).

If the rotation speed allows, increase the reduction ratio.

Increase the motor capacity.

If the stopping time of a hoisting machine is too long, adopt a mechanical brake.

In case of operation at a high frequency, increase the reduction ratio and reduce the inertia.
16.5.3 Capacity Selection Calculation Example
 Mechanical configuration
Reduction ratio 1/1 (direct coupling)
Screw pitch 10 [mm], transfer mass 20 [kg], thrust 0 [kg] (absent)
Servomotor
Ｗ