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Difference between linear motor and rotor motor: Lu Weibing Explained

by Kamlesh Bhati
March 18, 2020
How Linear Motor works in mobile, how rotor motor works in mobile
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There are two types of motor used in smartphones, Linear Motor and Rotor Motor. According to Lu Weibing linear motors have become the flagship standard. To better understand this, Lu Weibing Explained difference between linear motor and rotor motor.

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What is the “motor” in a mobile phone: Everyone’s mobile phone has a vibration function. The motor is used to provide vibration. Everyone will be curious about what the motors can say? First of all, vibration is not just a reminder function for incoming calls and text messages. It is also an interactive method, such as when you type, when you use the interface, and when you take a picture. In addition to the screen feedback, there will also be tactile feedback.

Difference between linear motor and rotor motor

Mobile phone motors are divided into two types according to the operation mode: rotor motors (column rotor motors, flat rotor motors) and linear motors (X-axis linear motors, Z-axis linear motors).

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Difference between linear motor and rotor motor
Difference between linear motor and rotor motor

How to judge the quality of mobile phone vibration experience? Look at the start and stop time, the amount of vibration on the hardware, but also need the cooperation of software.

Hardware level:

How Rotor Motor works in mobile

Rotor motor: A positive voltage motor rotates, a negative voltage motor brakes, and the eccentric rotor on the motor is used to achieve vibration. Because the rotor motor starts and stops for up to 60ms, and the vibration amount is only 0.6Gpp, it is impossible to start and stop urgently, so complex vibration cannot be completed. It’s like a van, with a slow acceleration of zero, and a long braking distance. Users often hear a “humming” sound when using it, and at the same time they will feel the vibration is not timely and loose.

“Buzzing” rotor motor: Why did the motor intelligently remind you of incoming calls? Now you can do tactile feedback? Because technology has improved. The ancient rotor motor is like a “tractor”, it only has a relatively fixed vibration mode. For example, when the rotor motor is turned on while typing, the mobile phone makes a “humming” sound. At present, most flagship machines no longer use “buzz” rotor motors.

How Linear Motor works in mobile

Linear motor: relies on AC voltage to drive the moving mass connected to the spring. When the mass is driven at the resonance frequency of the spring, the entire actuator vibrates. Because the linear motor directly converts electrical energy into linear motion mechanical energy without going through any intermediate conversion device, the efficiency is high, and the motor start-stop time only needs 15ms. The amount of vibration can reach 1.7Gpp, just like super running, with super fast acceleration, super fast speed and good braking performance. Not only the controllable vibration frequency and amplitude, but also complex vibration effects.

“Da Da Da” linear motor: A better motor brings richer and more layered tactile feedback, just like riding a car and feeling the sound of breathing. When typing, it can bring the feel of a mechanical keyboard. The camera focuses like a mechanical gear. Some games that support motors will also have different 4D tactile feedback.

Software level:

In addition to hardware level difference between linear motor and rotor motor, but system adaptation is also a top priority. The Z-axis linear motor on the Redmi K30 Pro is customized with up to 153 vibration scenarios under the MIUI system’s targeted optimization. When you use the dial pad to make a call, tap the notification bar switch, and the camera zooms, you can feel the clear sense of confirmation brought by the linear motor.

linear motor vs rotor motor
Software Level Optimization

Of course, the magic of linear motors doesn’t stop there. The driver chip of Redmi K30 Pro linear motors has dozens of built-in vibration waveforms. With the AP audio decoder in the mobile phone, it can also achieve audio vibration on the ringtone. Ringtones and melody match, each ringtone has a different multi-dimensional reminder effect.

In this video’s you can feel vibration difference. Video 1, Video 2

MIUI also customized the 4D vibration sense for the game. Through the recognition of various game sound effects such as gun sounds and vehicle sounds in the game, it can be used in different scenarios (retracting circle countdown, opening and closing mirrors, opening and closing doors, enemy steps approaching …), Different weapons (AKM, AWM, M16A4 …) and different kills (normal kill, headshot kill, triple kill or more …) all have different vibration effect feedback.

The variety of 4D vibrations brought by this linear motor can greatly enhance the presence and immersion in games. Various 4D vibration senses and related game adaptations are still being continuously updated.

How Linear Motor works in mobile, how rotor motor works in mobile
4D vibrations in games

Due to its principle, the rotor motor cannot start and stop quickly, so it cannot make complex vibrations with alternating length and length, and usually does not have a special vibration feeling. Vibration effect comes Redmi K30 Pro is “DaDaDa”. Hope you understood difference between linear motor and rotor motor. Stay up-to-date by following networks.

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Tags: Knowledge BaseLatest NewsRedmiRedmi k30 pro
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