Vibration Motor Magnetic Steel Assembly Drive Force
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Solution Overview
Problem
Current vibration motors in mobile terminals have small driving force, which is inadequate for effective acoustic performance, especially in screen sound applications where a stronger vibration motor is required.
Innovation Solution
A vibration motor design featuring a fixing frame, suspending frame, iron core, drive coil, and a magnetic steel assembly with specific polarity configurations and arrangements to enhance the magnetic field forces, allowing for increased drive force and improved acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional vibration motor structure is used, then device size is kept compact, but drive force is insufficient for screen sound applications
Solution Approach 1:
The magnetic steel assembly is segmented into multiple magnetic steel pieces (first, second, and third magnetic steels) with different polarity directions. This segmentation allows each piece to contribute differently to the magnetic field, increasing the overall drive force while maintaining a compact structure that fits within the vibration motor housing.
Solution Approach 2:
Different regions of the magnetic steel assembly have different local qualities - the first and third magnetic steels have polarity directions parallel to the drive coil axis, while the second magnetic steel has polarity direction perpendicular to the axis. This local quality variation optimizes the magnetic field distribution to maximize drive force in critical areas.
2Force
If magnetic steel assembly with specific polarity configuration is implemented, then drive force increases, but manufacturing complexity increases
Solution Approach 1:
The magnetic steel assembly is divided into separable magnetic steel pieces that can be manufactured independently and then assembled. This segmentation simplifies the manufacturing process by allowing each piece to be produced using standard magnetic steel fabrication techniques, then assembled in the specific polarity configuration using conventional assembly methods.
3Stability of the object's composition
If elastic support is used to suspend the moving coil assembly, then vibration isolation is improved, but mechanical strength is reduced
Solution Approach 1:
The elastic support acts as a flexible element that provides vibration isolation while maintaining mechanical strength. The elastic support's material properties and geometric design allow it to flex under vibration loads, isolating the moving coil assembly from the housing, while its inherent elasticity provides sufficient mechanical strength to support the assembly during operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enhanced magnetic field forces drive the suspending frame in a synchronized manner, increasing the vibration motor's drive force, stabilizing amplitude, and improving acoustic performance when used as a speaker.
Implementation Method 1
a drive coil, an elastic support and a magnetic steel assembly... When current accesses to the drive coil, the first magnetic steel, the second magnetic steel and the drive coil form a closed magnetic loop
Implementation Method 2
Magnetic field forces of the two magnetic loops can synchronously drive the magnetic steel assembly to move the suspending frame in the same direction
Implementation Method 3
the suspending frame is suspended and is supported over the fixing frame by the elastic support
Data Source
AI summary
The present disclosure discloses a vibration motor including a fixing frame, a suspending frame, an iron core, a drive coil, an elastic support and a magnetic steel assembly. The magnetic steel assembly includes a first magnetic steel, a second magnetic steel and a third magnetic steel that are superimposed in order. Polarity directions of the first magnetic steel and third magnetic steel are parallel with a central axis of the drive coil. A side of the first magnetic steel that the side facing the second magnetic steel has the same polarity with a side of the third magnetic steel that the side facing the second magnetic steel. The vibration motor can generate two magnetic loops whose magnetic forces increases drive force of the vibration motor.