--- 7 ---
0
2,000
4,000
6,000
8,000
10,000
12,000
0
100
200
300
400
500
600
HITACHI PDA-100D
HITACHI PDA-100M
C
B
Rotation speed of spindle
Stator coil temp. rise :
B
HITACHI PDA-100D
C
HITACHI PDA-100M
Rotation speed of spindle (/min)
Load
0
Stator coil temp. rise (k)
Burn-out point
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 Model PDA-100M is higher than that of B, C and Model PDA-100D at the same
torque. This means that the working efficiency of the Model PDA-100M is superior to B, C and Model
PDA-100D.
The stator coil temperature rise of the Model PDA-100M is lower than that of B, C and Model PDA-100D
thanks to the improved cooling mechanism and it is equivalent to that of the Model PDA-100D.
This means that the Model PDA-100M has a burn-resistant and tenacious motor.
1
2
Torque range
Summary of Contents for PDA-100M
Page 23: ......
