Motor Elastic Element Multi-Directional Vibration
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Solution Overview
Problem
Existing electric toothbrush motors are limited in their ability to remove dental calculi deeply, as they can only drive the toothbrush to swing left and right, effectively clearing only superficial layers.
Innovation Solution
A motor design featuring a rotor with a rotating shaft and magnetic part, coupled with an elastic element that allows movement in multiple directions, enabling high-frequency shimmy and knocking vibrations to effectively crush dental calculi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electric toothbrush motors are used to drive left-right swinging motion, then the structure is simple and easy to manufacture, but the cleaning depth is insufficient and can only remove superficial dental calculi
Solution Approach 1:
The patent applies the dynamics principle by introducing an elastic element that allows the rotor to dynamically change its motion state. The elastic element connects the rotor to the stator, enabling the rotor to transition from fixed-axis rotation to multi-directional movement including axial displacement and angular oscillation. This dynamic capability allows the toothbrush head to produce both left-right swinging and forward-backward knocking motions, significantly improving cleaning depth while maintaining a relatively simple motor structure.
Solution Approach 2:
The patent implements dimensionality change by adding axial movement capability to the traditional planar swinging motion. The elastic element enables the rotor to move not only in the radial direction (left-right swinging) but also in the axial direction (forward-backward knocking). This transition from two-dimensional to three-dimensional motion allows the toothbrush to effectively remove superficial and deep dental calculi simultaneously, enhancing cleaning precision without substantially increasing structural complexity.
2Manufacturing precision
If a rigid rotor structure is used for stable rotation, then the motor structure is simple, but the rotor cannot move in multiple directions to achieve deep cleaning
Solution Approach 1:
The patent applies parameter changes by modifying the mechanical coupling parameters between the rotor and stator. Instead of a rigid fixed connection, an elastic element with specific elasticity parameters is introduced. This elastic connection allows the rotor to have controlled freedom of movement in multiple directions while maintaining sufficient stability for effective cleaning. The elasticity parameter is optimized to enable both multi-directional motion for deep cleaning and adequate stability for practical use.
3Ease of operation
If the rotor is constrained to fixed-axis rotation, then the motor control is simple, but the toothbrush can only swing left and right without knocking vibration
Solution Approach 1:
The patent uses the dynamics principle to create a semi-passive control system. The elastic element automatically enables multi-directional motion when the motor operates, without requiring complex control algorithms. The rotor naturally oscillates and displaces axially due to the elastic coupling and electromagnetic forces, producing knocking vibrations that enhance cleaning depth. This maintains ease of operation with simple motor control while achieving superior cleaning effectiveness.
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 motor achieves a higher cleaning effect by allowing the toothbrush to move in multiple directions, effectively crushing dental calculi on the dental surface, providing a deeper cleaning compared to conventional electric toothbrushes.
Implementation Method 1
the elastic element is elastically deformable in at least two different directions
Implementation Method 2
the stator including a first electromagnetic group and a second electromagnetic group, the rotor being inserted between the first electromagnetic group and the second electromagnetic group
Data Source
AI summary
A motor comprises an enclosure, a stator and a rotor, the stator comprising a first electromagnetic group and a second electromagnetic group between which the rotor is inserted, the rotor comprising a rotating shaft and a magnetic part installed around the outer wall of the rotating shaft, the motor further comprising an elastic element with a first contact part fixed on rear cover of the enclosure and a second contact part connected with the rotating shaft, wherein the elastic element is elastically deformable in at least two different directions. The motor is applicable to electric toothbrushes, shavers, loudspeakers, electric hammers, stirrers, refrigerators, sewing machines, packaging and bundling machines, electromagnetic pumps, etc. A rotating shaft of the electric toothbrush using the motor has the effects of high-frequency shimming and high-frequency knocking vibration, and the dental calculi on the dental surface are crushed via high-frequency knock, with higher cleaning effect.