
B–65152E/03
6. DETERMINING THE
ACCELERATION TIME
BCATLTLON EOT TFC α
39
6
DETERMINING THE ACCELERATION TIME
The time required for each acceleration for the acceleration/deceleration
output characteristics shown below can be obtained from the following
equation.
Since machine load torque is not taken into consideration, the actual time
is slightly longer than the calculated time.
Acceleration/deceleration
output characteristics
(1) (2) (3)
Pf
Pm
Speed
0
Nb Nf Nm
[min
–1
]
[kW]
Output
J
L
: Load inertia converted for the motor
shaft [kg·m·s
2
]
Jm : Motor inertia [kg·m·s
2
]
Pf, Pm : Output [kW]
Nb, Nf, Nm : Speed [min
-1
]
NOTE
The target output during acceleration/deceleration is 1.2
times the 30–minute rated output of each model (10– or
15–minute rated output for some models). When an αC
series motor is used or if the machine load torque is high,
use the 30–minute rated output as is.
` Acceleration time (t
1
) in the constant–torque range (0 to Nb)
t
1
+ 0.10754
(J
L
) J
m
) Nb
2
Pf 1000
[s]
` Acceleration time (t
2
) in the constant–output range (Nb to Nf)
t
2
+ 0.10754
(J
L
) J
m
) (Nf
2
–Nb
2
)
2 Pf 1000
[s]