Linear vibration motor

Abstract

The invention provides a linear vibration motor. The linear vibration motor comprises a shell, a vibrator and a stator arranged on the shell and parallel with the vibrator, wherein the vibrator comprises a vibration block; the vibration block comprises at least a permanent magnet; the stator comprises a magnetic conductive block; the magnetic conductive block is stressed by magnetic field force that is the same and / or opposite to the vibration direction of the vibrator, wherein when the vibrator is in a balanced state, the resultant force of the magnetic field force is zero; when the magnetic conductive block is excited by exciting force to be subjected to relative displacement to the vibrator in the vibration direction of the vibrator, the resultant force direction of the magnetic field force is the same as the relative displacement direction; and the magnitude of the resultant force of the magnetic field force is in direct proportion to the magnitude of the relative displacement. By adoption of the linear vibration motor, relatively high vibration sense can be obtained easily under a free vibration state of the linear vibration motor through the self-driving function between the magnetic conductive block and the permanent magnet, and meanwhile, the starting time for the system operation is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of consumer electronics, and more specifically, relates to a linear vibration motor applied to portable consumer electronics products. Background technique [0002] With the development of communication technology, portable electronic products, such as mobile phones, handheld game consoles or handheld multimedia entertainment devices, have entered people's lives. In these portable electronic products, micro-vibration motors are generally used for system feedback, such as mobile phone call notifications, game console vibration feedback, and so on. However, with the development trend of thinner and lighter electronic products, various internal components also need to adapt to this trend, and the micro vibration motor is no exception. [0003] Existing miniature vibrating motors generally include an upper cover, a lower cover forming a vibration space with the upper cover, a vibrator (including counterweights ...

AI Technical Summary

Problems solved by technology

[0004] In the micro-vibration motor with the above-mentioned structure, the force driving the vibration of the vibrator all comes from the magnetic field force between the vibrator and the stator coil, due to the change of the position of the vibrator relative to the stator coil during the vibration process, and the magnitude of the current passing through the stator coil The change of direction and direction makes the force of the vibrator change, which leads to a nonlinear change in the vibration of the vibrator, which affects the vibration balance of electronic products.

In addition, the prior art uses the principle of resonance, using a small magnetic field driving force to drive a vibrator with a large mass to make it reach resonance, thereby obtaining a greater vibration sense

However, in this driving mode, it will inevitably cause slow system response

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