Axial Vibrating Motor Layout for Thin Stable Haptic Feedback
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Solution Overview
Problem
Conventional vibrating motors face challenges in downsizing due to the need for increased radial gaps, which hinders their compact design, especially in portable devices where space is limited.
Innovation Solution
The vibrating motor design includes a stationary portion with a bearing portion and a coil wound around a center axis, where the bearing portion has distinct regions that support the movable portion to vibrate vertically, allowing for reduced radial thickness and improved mass productivity by separating the coil inner region, thus enabling downsizing without compromising vibration stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the movable portion and the coil are arranged to directly face each other in the radial direction with a gap, then the vibration stability is improved, but the radial thickness increases and downsizing is hindered
Solution Approach 1:
The patent transitions from a radial arrangement where the movable portion and coil face each other to an axial arrangement where the movable portion is positioned above the coil. This dimensional change allows the components to be stacked vertically rather than arranged radially, reducing radial thickness while maintaining the necessary gap for vibration stability through the bearing portion's first region.
Solution Approach 2:
The bearing portion's first region (coil inner region) is nested within the overall motor structure, allowing the coil to be positioned axially below the movable portion while the bearing portion extends axially to provide support. This nesting enables compact integration of components in the axial direction, freeing up radial space for downsizing.
2Manufacturing precision
If the radial gap is increased to ensure proper spacing between components, then the manufacturing precision is improved, but the device size increases
Solution Approach 1:
The patent moves the gap management from the radial dimension to the axial dimension. The bearing portion's first region provides precise axial positioning and support for the movable portion, allowing controlled spacing in the axial direction while minimizing radial dimensions. This enables manufacturing precision to be achieved without increasing overall device volume.
3Productivity
If the coil inner region is separated and repositioned, then the mass productivity is improved, but the device complexity increases
Solution Approach 1:
The bearing portion is segmented into distinct regions, with the first region (coil inner region) serving a specific function of providing axial support and positioning. This segmentation allows the coil to be independently positioned in the axial direction below the movable portion, simplifying assembly and improving mass productivity while the regional division of the bearing portion actually reduces overall complexity by clearly defining functional zones.
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 design allows for a more compact vibrating motor with enhanced vibration stability and increased productivity, as it reduces the radial thickness and simplifies the configuration, while maintaining effective vibration and haptic feedback capabilities.
Implementation Method 1
When the coil is energized to generate a magnetic field, the movable portion vibrates
Data Source
AI summary
A vibrating motor includes a stationary portion, and a movable portion capable of vibrating with respect to the stationary portion along a center axis extending in a vertical direction. The stationary portion includes a bearing portion which extends along the center axis and supports the movable portion to be able to vibrate along the center axis, and a coil including a conductive wire wound around the center axis. The bearing portion includes a first region including a coil inner region on a radially inner side of the coil.