Electromagnetic Massage Device with Variable Force Control
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Solution Overview
Problem
Traditional massage devices, such as massage guns, have fixed massage force mechanisms that can cause pain on superficial muscles and reduce effectiveness on deep muscles, and existing solutions either generate noise or risk skin injury due to adjustable impact forces.
Innovation Solution
An electric massage device with an electromagnetic driving unit and a control module that gradually increases massage force during the outward stroke, using a driving current that increases with elapsed time or displacement, ensuring a comfortable and effective massage without causing skin hurt or muscle injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional cam mechanism is used to convert rotary motion into linear motion for massage, then the massage device can produce impact massage to deep muscles, but the user feels pain when the massage head hits the skin and superficial muscles due to the strong massage force
Solution Approach 1:
The patent applies dynamics by transitioning from a static cam mechanism with fixed massage force to a dynamic electromagnetic driving unit with variable massage force. The electromagnetic driving unit adjusts the driving current based on stroke position, making the massage force dynamic rather than constant, thereby resolving the contradiction between deep muscle massage effectiveness and superficial muscle comfort
Solution Approach 2:
The patent changes the parameter of massage force from a fixed value (determined by cam geometry) to a variable parameter that changes with stroke position. The electromagnetic driving unit modifies the driving current parameter according to the stroke displacement, enabling the massage force to be stronger at deep muscle positions and weaker at superficial muscle positions, thus resolving the pain contradiction
2Object-affected harmful factors
If the stroke of the cam is shortened to reduce the massage force and relieve pain on superficial muscles, then the pain is reduced, but the massage effect on deep muscles is greatly reduced
Solution Approach 1:
Instead of reducing the stroke length, the patent uses a dynamic electromagnetic driving unit that maintains a sufficient stroke length for deep muscle massage while dynamically adjusting the force applied. The system achieves both goals by making the massage force adaptive to the depth and sensitivity of the tissue being massaged
Solution Approach 2:
The patent applies local quality by differentiating the massage force based on the local characteristics of the tissue at different stroke positions. The electromagnetic driving unit provides different force levels at different positions: weaker force when contacting superficial muscles and stronger force when reaching deep muscles, thus resolving the contradiction between pain reduction and massage effectiveness
3Adaptability or versatility
If an impact gun with a linear actuator and spring is used to provide adjustable massage depth and strength, then the massage depth and strength are adjustable, but loud noise is generated during the outward stroke and instantaneous impact force may cause skin hurt and injure the muscles
Solution Approach 1:
The patent replaces the mechanical linear actuator with spring system with an electromagnetic driving unit. This substitution eliminates the noise generated by mechanical components and the instantaneous impact force caused by spring release. The electromagnetic system provides smooth, controlled force application while maintaining adjustable massage parameters
Solution Approach 2:
The patent uses parameter changes by controlling the driving current of the electromagnetic driving unit to achieve adjustable massage depth and strength without the harmful effects of mechanical impact systems. The current parameter is modulated to provide gradual force application rather than instantaneous impact, eliminating noise and skin injury risks while preserving adjustability
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 device provides a comfortable and effective massage by gradually increasing force to deep tissues while minimizing pain on superficial muscles, with adjustable settings for customizable massage experiences and reduced noise and energy consumption.
Implementation Method 1
The electromagnetic driving unit is configured to drive and move the output shaft in a linear motion so as to produce impact and vibration massage effects on a user
Implementation Method 2
drive and move the output shaft in a linear motion so as to produce impact and vibration massage effects
Data Source
AI summary
The present invention relates to an electric massage device capable of gradually increasing a massage force during an outward stroke, mainly comprising a massage module and a control module. In the outward stroke, the control module applies a driving current to the electromagnetic driving unit, and the driving current is gradually increased with an elapsed time or a stroke displacement of the output shaft. In a return stroke, the control module deenergizes the driving current or applies a weak reverse current less than one-fifth of the driving current. At the beginning of the outward stroke, the massage force is weak due to the smaller driving current and hence would not cause skin hurt. At the end of the outward stroke, the massage force is strong due to the greater driving current and hence produces a deep muscle massage effect.