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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.
12,000
10,000
8,000
6,000
4,000
2,000
0
0
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-100G and G 10SK2 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-100G and G 10SK2
are superior to B, C, Models PDA-100D and G 10SK.
The stator coil temperature rise of the Models PDA-100G and G 10SK2 is lower than that of B, C and Model
G 10SK2 thanks to the improved cooling mechanism and it is equivalent to that of the Model PDA-100D.
This means that the Models PDA-100G and G 10SK2 have a burn-resistant and tenacious motor.
Rotation speed of spindle
B
HITACHI PDA-100G, G 10SK2
C
HITACHI G 10SK
C
Torque range
HITACHI G 10SK2
HITACHI PDA-100G
HITACHI PDA-100G, G 10SK2
Stator coil temp. rise
Load
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B
HITACHI PDA-100D
X: Burn-out point
600
500
400
300
200
100
0
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