Hitachi G 13SR, Технические данные и руководство по обслуживанию

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6-2. Comparisons in Torque vs. Rotation Speed and Stator Coil Temperature Rise
Fig. 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
Fig. 1 indicates:
1 The rotation speed of maker C's model at the same torque is low and the stator coil temperature rise is high,
which causes low motor power.
2 The rotation speed of HITACHI G 13SR at the same torque is high and the stator coil temperature is low. As
the speed and the temperature are well balanced, HITACHI G 13SR ensures excellent performance for
different jobs regardless of the magnitude of load.
HITACHI G 10SR/G 12SR
HITACHI G 13SR
Rotation speed of spindle
HITACHI G 10SR/G 12SR
C
HITACHI G 13SR
400
300
200
100
0 0
2,000
4,000
6,000
8,000
10,000
12,000
C
: Burn-out point
Stator coil temp.
Rotation speed of spindle (/min.) Stator coil temp. rise (K)
Torque (Load)