Fuji Electric ALPHA7, User Manual

Page: 647 / 662

CHAPTER 16 APPENDIXES
20
Capacity Selection Calculation
16
Follow the procedure below to perform capacity selection calculation.
Capacity selection flow chart
(1) Calculate the load inertia according to the
configuration of the machine.
(2) Calculate the load torque according to the
configuration of the machine.
(3) Temporarily select the motor capacity.
(4) Check the shortest acceleration/
deceleration time. If the time is
designated, calculate the necessary
acceleration/deceleration torque.
(5) Create the torque pattern according to
the operation pattern.
(6) Calculate the effective torque according
to the torque pattern.
(7) If the effective torque (T
rms
) is smaller
than the rated torque (T
R
), operation can
be made with the designated operation
pattern.
(8) Calculate the regenerative power and, if
necessary, select the regenerative
resistor.
(9) Review the specifications of the machine
if possible.
Start
Calculate the moment of
inertia of load
Calculate the load torque
T
L
Temporarily select the
motor capacity
Create the torque pattern
Calculate the actual
torque
Trms ≦ TR
Calculate the regenerative
power
End
Review specifications of the
machine. Change the operation
pattern
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Yes
No
Calculate the shortest
acceleration/deceleration time.
(Calculate the acceleration/
deceleration torque.)