Actuator with Opposite-Direction Movable Sections for Vibration Cancellation
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Solution Overview
Problem
Existing electrical beauty appliances face challenges in downsizing due to the need for space-consuming dynamic vibration absorbers or power transducers, and they often transmit vibration to users, especially when driven at high speeds.
Innovation Solution
An actuator with a fixed section, a first movable section, and a second movable section, where both sections are magnetized in an inside-outside direction and elastically mounted on a spindle, allowing them to reciprocate in opposite directions when current flows through a coil, effectively canceling vibration without requiring additional absorbers or transducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dynamic vibration absorber is used to suppress vibration, then vibration suppression is achieved, but device volume increases
Solution Approach 1:
The patent merges the vibration suppression function with the main actuator structure by making the movable section itself serve as both the driving element and the vibration-canceling element. The first and second movable sections are integrated into a single actuator assembly, eliminating the need for separate dynamic vibration absorbers while achieving vibration suppression through their opposite-direction reciprocation.
Solution Approach 2:
The movable section is designed to perform multiple functions: it serves as both the primary actuator for driving the cutting edges and as the vibration suppression mechanism. By making the movable section reciprocate in opposite directions, it simultaneously achieves cutting motion and vibration cancellation, reducing the overall device volume.
2Speed
If a power transducer mechanism is used to convert motor driving force into linear motion, then high-speed operation is achieved, but device volume increases
Solution Approach 1:
The patent extracts and eliminates the power transducer mechanism from the actuator design. By using a voice coil motor that directly generates linear motion through electromagnetic interaction between the coil and permanent magnets, the complex mechanical transmission components are removed, achieving high-speed operation with a compact structure.
Solution Approach 2:
The patent replaces traditional mechanical power transducer mechanisms with an electromagnetic direct-drive system. The voice coil motor converts electrical energy directly into linear mechanical motion through electromagnetic forces, eliminating the need for mechanical gears, belts, or linkages, thereby reducing device volume while maintaining high-speed capability.
3Object-affected harmful factors
If two movable sections are arranged parallel to each other with opposite moving directions, then vibration is suppressed, but manufacturing complexity increases due to centroid balancing requirements
Solution Approach 1:
The patent employs asymmetric magnetization directions for the first and second permanent magnets to simplify the structure. By magnetizing the first permanent magnet in one direction and the second permanent magnet in the opposite direction, the design achieves balanced centrifugal forces without requiring complex symmetric arrangements, reducing manufacturing complexity while maintaining vibration suppression.
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 enables effective vibration suppression, achieves downsizing, and allows for high-speed operation with reduced noise and improved user comfort by ensuring the centers of gravity of the movable sections are coaxial, eliminating offset vibration directions.
Implementation Method 1
when current flows in the coil, the first movable section and the second movable section move in the opposite directions
Implementation Method 2
a first movable section that includes a first magnet magnetized in an inside-outside direction and disposed to cover the outer peripheral surface of one end in an axial direction of the fixed section, that is mounted on the spindle in an elastically-maintained state
Data Source
AI summary
An actuator includes a fixed section that includes a spindle and a coil fixed to the spindle, a first movable section that includes a first magnet magnetized in an inside-outside direction and disposed to cover the outer peripheral surface of one end in an axial direction of the fixed section, that is mounted on the spindle in an elastically-maintained state, and that is movable in the axial direction, and a second movable section that includes a second magnet magnetized in the inside-outside direction and disposed to cover the outer peripheral surface of the other end in the axial direction of the fixed section, that is mounted on the spindle in an elastically-maintained state, and that is movable in the axial direction. When current flows in the coil, the first movable section and the second movable section move in the opposite directions.