Hitachi G 12SE2, Технические данные и руководство по обслуживанию

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6-2. Comparisons in Torque vs. Rotation Speed and Stator Coil Temperature Rise
Figure 4 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. 4 Comparisons in torque vs. rotation speed and stator coil temperature rise
Load
Rotation speed of spindle (/min)
12,000
4,000
8,000
10,000
0
HITACHI G 12SE2/G 13SE2
HITACHI G 12SE2/G 13SE2
B
6,000
2,000
Rotation speed of spindle
HITACHI
G 12SE/G 13SE
Stator coil temp rise
Q
B
Q
HITACHI G 12SE/G 13SE
600
500
400
300
200
100
Stator coil temp rise (K)
Figure 4 indicates:
(1) The Models G 12SE2 and G 13SE2 keep higher rotation speed than the Models G 12SE/G 13SE, Q and B in
the heavy load range. This means that the working efficiency of the Models G 12SE2 and G 13SE2 is superior
to the Models G 12SE/G 13SE, Q and B.
(2) The stator coil temperature rise of the Models G 12SE2 and G 13SE2 is lower than that of the Models G 12SE/
G 13SE, Q and B. This means that the Models G 12SE2 and G 13SE2 are resistant to burn out even at a
heavy load operation and their motors are tough.