
B-65302EN/01 SPECIFICATIONS FOR THE βiS SERIES 3.SELECTING A MOTOR
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3.4 CHARACTERISTIC CURVE AND DATA SHEET
Performance of each motor model is represented by characteristic
curves and data sheet shown below, which are given in Part II.
3.4.1 Performance Curves
The characteristic curves representing the "speed-torque
characteristics" and "overload duty characteristic" are given for each
motor model.
Speed-torque characteristics
Speed-torque characteristics indicate the relationship between the
output torque and speed of the motor.
The motor can be operated continuously at any combination of speed
and torque within the continuous operating zone. Within the
intermittent operating zone outside the continuous operating zone, the
motor must intermittently be used using the duty cycle curve.
The limit of continuous operating zone is determined under the
following conditions.
• The ambient temperature for the motor is 20°C.
• The drive current of the motor is pure sine wave.
And this zone may be limited by the thermal protection of mounted
precision instrument. (Pulsecoder)
The torque decreases by 0.11% for the βi s series according to the
negative temperature coefficient of magnetic materials every time the
ambient temperature increases by 1°C after it exceeds 20°C.
The intermittent operating zone may be limited by the motor input
voltage.
The following table shows the values when the input voltage is 200 V.
S
eed - tor
ue characteristics
0
2
4
6
8
10
12
14
16
0 1000 2000 3000
Speed (min
-1
)
Torque (N
⋅
⋅
⋅
⋅
m)
Intermittent operating
Continuous operatin
Fig.3.4.1(a) Example of β
ββ
β8/3000is