CHAPTER 15 APPENDIXES
Capacity Selection Calculation 15-17
15
Follow the procedure below to perform capacity selection calculation.
Capacity selection flow chart
Start
Calculate the motor speed.
Calculate the load torque
T
L.
Temporarily select the
motor capacity.
Calculate the shortest
acceleration/deceleration time.
(Calculate the acceleration/
deceleration torque.)
Create the torque pattern.
Calculate the effective
torque.
T
rms
<T
R
Calculate the regenerative
power.
End
Review specifications of the
machine. Change the operation
pattern.
(1)
(10)
Yes
No
Calculate the moment of
inertia of load.
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
_
(1) Calculate the motor speed according to the
configuration of the machine and the line
speed.
(2) Calculate the load inertia according to the
configuration of the machine.
(3) Calculate the load torque according to the
configuration of the machine.
(4) Temporarily select the motor capacity.
(5) Check the shortest acceleration/
deceleration time. If the time is designated,
calculate the necessary
acceleration/deceleration torque.
(6) Create the torque pattern according to the
operation pattern.
(7) Calculate the effective torque according to
the torque pattern.
(8) If the effective torque (T
rms) is smaller than
the rated torque (TR), operation can be
made with the designated operation
pattern.
(9) Calculate the regenerative power and, if
necessary, select the regenerative resistor.
(10) Review the specifications of the machine if
possible.
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