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6-2. Comparisons in Torque vs. Rotation Speed and Stator Coil Temperature Rise
Figure 1 shows comparisons of the rotation speed and the stator coil temperature rise between a competitive
model with respect to torque. Torque represents the magnitude of load, i.e., the amount of pressing force, cutting
depth and forward force in actual cutting jobs. This shows that a powerful motor is less likely to burn out because
it has both a minimum drop of rotation speed even at a greater torque and a lower stator coil temperature rise at
the same torque.
Fig. 1 Comparisons in torque vs. rotation speed and stator coil temperature rise
Figure 1 indicates the following:
The motor speed of the Models PDA-100K and G 10SK3 is higher than that of B, C, Models PDA-100D and
G 10SK at the same torque. This means that the working efficiency of the Models PDA-100K and G 10SK3
are superior to B, C, Models PDA-100D and G 10SK.
The stator coil temperature rise of the Models PDA-100K and G 10SK3 is lower than that of B, C and Model
G 10SK thanks to the improved cooling mechanism and it is equivalent to that of the Model PDA-100D.
This means that the Models PDA-100K and G 10SK3 have a burn-resistant and tenacious motor.
Load
Stator coil temp. rise (K)
2,000
0
B
4,000
6,000
8,000
12,000
10,000
0
0
600
100
200
300
400
500
Rotation speed of spindle (/min.)
Torque range
Stator coil temp. rise X: Burn-out point
HITACHI G 10SK
HITACHI G 10SK
HITACHI PDA-100D
HITACHI PDA-100K, G 10SK3
B
HITACHI PDA-100K, G 10SK3
HITACHI PDA-100D
Rotation speed of spindle
X
X
X
X
X
C1
C1
C2
C2
X
1
2
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