Selling Point Descriptions - Hitachi CM 4SB2 Technical Data And Service Manual

4-1. Selling Point Descriptions

(1) Powerful 1,320 W motor with the class-top maximum power input
The Model CM 4SB2 has high overload durability thanks to the most powerful motor in the class.
300
250
200
150
100
50
0
0.4
Following table shows a comparison of the spindle torque ratio with the conventional models and a competitor
when the stator coil temperature is 200 ûC. It is clear that high overload durability can be obtained as the
torque becomes high.
Torque (N m)
•
Torque ratio
(2) Highly vibration-resistant and dust-resistant armature coil
The Model CM 4SB2 has substantially higher vibration resistance than the conventional model because
movement of the coil due to vibration is suppressed by coating the periphery of the joint between the armature
coil and the commutator with a special glue. It also prevents dust and debris of concrete or stone from getting
in and scratching the coil surface.
Metal bearing bushing
Torque-temperature curve
Model
CM 4SA2
1.23 N . m
C
1.41 N . m
0.8 1.2
Spindle-torque (N . m)
CM 4SB2
1.98
1.37
1.6
2.0
CM 4SB
CM 4SA2
1.45
1.0
Resin tail cover
Sealed armature coil (Glue coated):
Improved resistance to vibration
Protecting from dust and debris
--- 2 ---
Model
CM 4SB
1.45 N . m
Model
CM 4SB2
1.98 N . m
2.8
2.4
C
1.41
1.23
0.85
0.97