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Principle/Mechanism

Vibration Components
Vibration Motors
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How the Vibration Motor Works
The primary function of the vibration motor is to alert the user to incoming calls. Vibration motors are normally classified into cylinder type and button type. Here, we will look at how the cylinder type works.

Coreless Motors
A coreless motor is a DC motor with a rotor that does not have an iron core. Instead, it has a permanent magnet inside and a coil outside.

 Eliminating the iron core from the rotor offers the following advantages:
Smaller rotational inertia and faster
Smoother rotation due to absence of magnetic
Fig2 Structure of Coreless Motor
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Fig3 Cross-Section of Coreless Motor
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**Housing and Permanent Magnet are fixed while Rotor revolves.
Principle for Vibrating A Handset
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.
Fig4 The inner structure of a Vibration Motor
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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
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