
B-65302EN/01 SPECIFICATIONS FOR THE βiS SERIES 3.SELECTING A MOTOR
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3.2.2 Calculating the Motor Speed
Calculate the motor speed using the movable part rapid traverse rate
and traveling distance per revolution of the motor and check that the
calculated motor speed does not exceed the maximum motor speed
(rated speed for continuous operation).
l
V
m
V =
V
m
: Motor speed in rapid traverse [min
-1
]
V : Workpiece rapid traverse rate [m/min]
l : Traveling distance per revolution of the motor [m]
[Example of calculation for condition 2] Motor speed
When V is 60 [m/min] and l is P×Z
1
/Z
2
= 0.020×1/1 = 0.020 [m], V
m
is 60/0.020 = 3000 min
-1
.
Then, select a motor whose load torque when cutting is not executed
(stall torque) is 1.4 [N⋅m] and whose maximum speed is at least 3000
[min
-1
] from the data sheet. The β8/3000is (with a stall torque of 7.0
[N⋅m]) is provisionally selected with considering the
acceleration/deceleration condition described in the following
subsection.