Mobile phone vibration motor – long knowledge

What is a mobile phone motor?

Mobile phone motor generally refers to the application of the vibration of mobile phone small da, his main role is to make mobile phone vibration effect;The vibration effect serves as feedback to the user during the operation of the mobile phone.

There are two types of motors in mobile phones: rotor motors and linear motors

Rotor motor:

The so-called rotor motors are similar to those seen in four-wheel drive vehicles.Like conventional motors, they use electromagnetic induction, a magnetic field created by an electric current, to drive the rotor to spin and vibrate.

Rotor motor

Rotor motor structure diagram

As shown here

In the past, most of the vibration schemes of mobile phones adopt rotor motor. Although the rotor motor has simple manufacturing process and low cost, it has many limitations.For example, slow startup, slow braking, and non-directional vibration can cause a noticeable “drag” when the phone vibrates, as well as no directional guidance (think of the past when someone called and the phone spun and jumped).

And the volume, especially the thickness, of the rotor motor is difficult to control, and the current technology trend is thinner and thinner, even after improvement, the rotor motor is still difficult to meet the strict requirements on the space size of the phone.

Rotor motor from the structure is also divided into ordinary rotor and coin rotor

Common rotor: large volume, poor vibration feel, slow response, loud noise

Coin rotor: small size, poor vibration feel, slow response, slight vibration, low noise

Specific application:

Ordinary rotor motor

Android (xiaomi) :

Rotor motor

SMD backflow vibration motor (rotor motor is used for redmi 2, redmi 3, redmi 4 high configuration)

Rotor motor

(rotor motor user redmi note2)

vivo:

Rotor motor

Vivo NEX mounted rotor motor

Coin rotor motor

OPPO Find X:

Coin rotor motor

Inside the circular selection is the coin-shaped rotor motor mounted by OPPO Find X

IOS (iphone) :

Earliest iPhone has been using a technique called “ERM” eccentric rotor motor rotor motor, used in the iPhone 4 and 4 generations ago models, and in the CDMA version of the apple iPhone 4 and iPhone 4 s on short use the LRA coin type motor (linear motor), may be for reasons of space, the apple on the iPhone 5, 5 c, 5 s changed back to the ERM motor.

Eccentric rotor motor

The iPhone 3Gs comes with an ERM eccentric rotor motor

Eccentric rotor motor

The iPhone 4 comes with an ERM eccentric rotor motor

Eccentric rotor motor

The iPhone 5 comes with an ERM eccentric rotor motor

Rotor motor

The rotor motor on the left side of the iphone5c and on the right side of the iphone5 are almost identical in appearance

Linear motor:

Like a pile driver, a linear motor is actually an engine module that converts electrical energy directly (note: directly) into linear mechanical energy by means of a spring mass that moves in a linear fashion.

Linear motor

Linear motor structure diagram

The linear motor feels more compact to use, and it’s thinner, thicker and more energy efficient.But the cost is higher than the rotor motor.

At present, linear motors are mainly divided into two types: transverse linear motors (XY axis) and circular linear motors (Z axis).

Simply put, if the hand screen is the ground you are currently standing on, you are a point in the screen, starting with yourself, setting up the X axis in your left and right directions, setting up the Y axis in your front and rear directions, and setting up the Z axis with your up and down (head up and head down).

The lateral linear motor is the one that pushes you back and forth (XY axis), while the circular linear motor is the one that moves you up and down (Z axis) like an earthquake.

The circular linear motor has shorter stroke, weaker vibration force and shorter duration, but it improves a lot compared with the rotor motor.

Specific application:

IOS (iphone) :

Circular linear motor (z-axis)

The CDMA version of the iPhone 4 and the iPhone 4s briefly used the coin-shaped LRA motor (circular linear motor)

Circular linear motor

Linear motor (circular linear motor) first used on iphone4s

Circular linear motor

After dismantling

Circular linear motor

After the motor is taken apart

(2) transverse linear motor (XY axis)

Initial linear motor:

On the iPhone 6 and 6 Plus, apple officially started using the elongated LRA linear motor, but the vibration felt very different from the circular linear or rotor motors it used before, due to the technical level.

linear motor

The original linear motor on the iphone6

linear motor

After dismantling

linear motor

LRA linear motor on iphone6plus

linear motor

After dismantling

linear motor

The LRA linear motor working on the iphone6plus

The android:

Led by apple, linear motor, as a new generation of mobile phone motor technology, is gradually recognized by mobile phone manufacturers. Mi 6, one plus 5 and other mobile phones were successively equipped with linear motor in 2017.But the experience is far from apple’s TAPTIC ENGINE module.

And most current android models (including the flagship) use circular linear motors.

The following are some models equipped with circular linear motor (z-axis) :

The new flagship mi 9 launched last month:

Circular linear motor

Inside the circular selection is a large-size circular linear motor (z-axis) mounted by the mi 9.

Huawei flagship Mate 20 Pro:

Circular linear motor

Inside the circular selection is the conventional circular linear motor (z-axis) mounted by Mate 20 Pro.

V20 glory:

Circular linear motor

In the circular selection is the conventional circular linear motor (z-axis) mounted by the glory V20.

In conclusion:

According to the different vibration principle, the vibration motor of mobile phone can be divided into rotor motor and linear motor.

Both rotor motor and linear motor vibration are based on the principle of magnetic force. Rotor motor drives counterweight vibration by rotation, and linear motor shakes by rapid shaking of counterweight by magnetic force.

Rotor motors are divided into two types: ordinary rotor and coin rotor

Linear motors are divided into longitudinal linear motors and transverse linear motors

The advantage of rotor motors is cheap, while the advantage of linear motors is performance.

Ordinary rotor motor to achieve full load generally needs 10 vibration, linear motor can be fixed once, linear motor acceleration is much larger than the rotor motor.

In addition to better performance, the vibration noise of the linear motor is also significantly lower than that of the rotor motor, which can be controlled within 40db.

Linear motors provide a crisper (high acceleration), faster response time, and quieter (low noise) vibration experience.

 


Post time: Aug-16-2019
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