With the improvement of living standards and technological progress, mobile phones have become an essential tool in people’s lives. According to CISCO’s statistics, sales of mobile devices such as mobile phones have been increasing every year in last 6 years. The phone reminds users of incoming calls or a new short message in the inbox. In these cases, mobile phones use tactile technology to attract users’ attention. About 1/3 of smartphones use tactile feedback technology.With the application of haptic technology in mobile phones, cell phone vibration motor have become the core component of mobile phones.
What Is Mobile Phone Vibration Motor
There are two basic types of vibration motor. An eccentric rotating mass vibration motor (ERM) uses a small unbalanced mass (we usually call it eccentric weight) on a DC motor, when it turns it creates a centrifugal force that translates to vibrations. A linear vibration motor contains a moving mass attached to a wave spring, which creates a force when driven.
The most widely used cell phone vibration motor in the market is ERM motor. Compared to LRA motors he has the following advantages.
1. ERM motor technology is mature, the price is very cheap.
2. Diverse size, from φ3 to φ12, you can easily find the motor that matches your design.
3. Diverse installation and connection method, SMD Reflow, Spring Contact, FPC, Connectors, etc.
Coin Vibration Motor—-The Thinnest Motor In The World
There are three types of ERM vibration Motor, coin type, coreless cylindrical type and SMD type. The coin type vibration motor is very popular in mobile phone field. Because the coin motor is the thinnest motor in the world, and the thinnest we can do is 1.8mm, which is suitable for thin and light smartphones. You can click on the picture above for motor selection. We have coin motors with different sizes and different contact modes for your choice.
SMD surface mount cell phone vibration motor have three main advantages. First, the small size of the motor saves space. The smallest size we can achieve is 3.7*2.7mm. . The second is the motor can be directly soldered to the PCB board, which is suitable for automated production. These SMD Surface mount vibrator motor use high temperature materials which can withstand 2-3 reflows. The third is that the motor has good reliability and can work normally in an environment of -40℃ to 80℃.
Linear Vibration Motor—-Faster Acceleration
Compared to the ERM cell phone vibration motor, the linear vibration motor has faster acceleration. It takes only 50ms from the standstill to the highest vibration level, while the ERM vibration motor needs 100ms~200ms. Higher accelerations result in better haptic feedback, so more and more mobile phone brands are starting to use linear motors instead of traditional motors. Besides, LRA realizes the vibration by alternating current. It have small vibration noise, good starting current , long lifetime and stable G-force which are great improvement compare to ERM motor. The motor may be the trend of the development of the mobile phone vibration motor in the future.