Principles of vibration
An offset counterweight is fitted to the end of the motor shaft. When the shaft turns, the imbalance in the counterweight causes the handset to vibrate. Figure 4 shows the internal structure of the motor, while Table 1 shows the criteria.
| Counter Weight
|
Speed[rpm]
|
Vibration[N]
|
| 4CH |
R2.5×L3.5×180° |
9500 |
1.50 |
| R3.0×L3.5×150° |
9500 |
2.18 |
| 4CR |
R3.0×L4.0×150° |
9500 |
2.56 |
| 4.4CH |
R3.0×L4.0×150° |
7400 |
1.91 |
| R3.0×L4.0×150° |
8500 |
2.37 |
|