Vehicle Sound Generator Yoke Segmentation for Compact Design
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Solution Overview
Problem
Conventional sound generators for vehicles face issues with increased size and reduced driving power due to excessive gaps between yokes, leading to coil damage from transverse flux and vibration.
Innovation Solution
A sound generator design that minimizes the gap between internal and external yokes by dividing the yoke into separate components, with the external yoke fixed to the housing and the coil wound around a bobbin, allowing only the internal yoke to vibrate, thus reducing magnetic field leakage and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coil part is fixed between internal yoke and external yoke with gaps at both sides, then the yoke can vibrate up and down, but the gap increases and driving power decreases
Solution Approach 1:
The yoke is divided into internal yoke and external yoke as separate components. The internal yoke is designed to vibrate while the external yoke remains stationary, allowing the coil to be positioned closer to the internal yoke without requiring excessive clearance for full yoke vibration.
Solution Approach 2:
The internal yoke and external yoke are combined to form a unified magnetic circuit structure where the internal yoke vibrates within the magnetic field generated by the coil, and the external yoke provides a stable return path for magnetic flux.
2Volume of moving object
If the coil part exists between the yokes vibrating up and down, then the structure is compact, but coil damage occurs due to transverse flux of the yoke
Solution Approach 1:
By segmenting the yoke into internal and external parts, the internal yoke is constrained to vibrate only in the axial direction within the magnetic field, preventing transverse flux that would damage the coil while maintaining compact structure.
Solution Approach 2:
The external yoke acts as an intermediary structure that provides a stable magnetic return path and physical constraint, preventing the internal yoke from developing transverse flux that would damage the coil.
3Ease of operation
If gaps are provided at both sides of the yoke, then the yoke can vibrate freely, but the size of the yoke increases due to the gap
Solution Approach 1:
The yoke system is segmented into a stationary external yoke and a vibrating internal yoke. This allows the internal yoke to vibrate freely with minimal clearance from the coil while the external yoke maintains a compact overall size by providing a stable outer boundary.
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
This configuration increases driving power, reduces size, and prevents coil damage by suppressing transverse flux, improving the reliability and stability of the sound generator.
Implementation Method 1
a coil is wound along a circumference of the bobbin, and an external yoke fixed to the housing in a cylinder shape wrapping the coil and an outside of the internal yoke therein
Implementation Method 2
a driving part including an internal yoke and a magnet, inserted into the housing and disposed on the elastic member to be slid up and down in the housing
Data Source
AI summary
A sound generator apparatus for a vehicle may include a housing and a elastic member arranged at a lower portion of the housing, a driving part including an internal yoke and a magnet, inserted into the housing and disposed on the elastic member to be slid up and down in the housing, a bobbin, an upper end of which is fixed to an inside upper portion of the housing, extended in a downward direction with wrapping the driving part, wherein a coil is wound along a circumference of the bobbin, and an external yoke fixed to the housing in a cylinder shape wrapping the coil and an outside of the internal yoke therein.