BLDC Motor Massage Device Linear Motion Conversion
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Solution Overview
Problem
Existing massage devices installed in vehicles, such as those using air cells or cylinder-type DC motors, lack sufficient speed and strength to provide an effective massage, especially in limited spaces like vehicle seats where driver or occupant fatigue builds up during long drives.
Innovation Solution
A massage device incorporating a striking unit driven by a brushless direct current (BLDC) motor, with an operation unit that converts rotational force into linear motion, and a controller to adjust rotation speed based on user input or vehicle speed, enabling enhanced massage performance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If air cell or cylinder-type DC motor is used for massage device, then device complexity is reduced and ease of manufacture is improved, but massage strength and speed are insufficient
Solution Approach 1:
The patent replaces the traditional air cell or cylinder-type DC motor mechanical system with a brushless motor system that converts rotational force into linear motion through electromagnetic fields. This substitution enables higher massage strength and speed while maintaining manageable device complexity through optimized motor design.
Solution Approach 2:
The patent changes the operating parameters by using a brushless motor that can vary rotation speed and output force dynamically. This allows the massage device to deliver variable intensity strokes with higher peak strength compared to fixed-parameter air cell systems, resolving the contradiction between strength and complexity.
2Speed
If rotation speed of driving unit is increased to improve massage speed, then massage effectiveness is improved, but noise increases
Solution Approach 1:
The patent replaces traditional mechanical transmission systems that generate noise at high speeds with a brushless motor system that directly converts electrical energy to rotational motion. This eliminates mechanical friction and gear noise, allowing high rotation speeds to be achieved with reduced noise levels.
Solution Approach 2:
The patent employs periodic pulse-width modulation (PWM) control of the brushless motor to achieve variable speed operation. By using periodic electrical pulses rather than continuous power, the system can adjust rotation speed to optimize massage effectiveness while minimizing noise generation during different operational phases.
3Volume of moving object
If compact design is maintained for vehicle installation, then space utilization is improved, but massage functionality is limited
Solution Approach 1:
The patent divides the massage device into modular components: a compact brushless motor unit, a separate operation unit for motion conversion, and a controller. This segmentation allows the system to be installed in limited vehicle space while maintaining full massage functionality through coordinated operation of distributed components.
Solution Approach 2:
The patent uses a linear motion conversion mechanism that transforms rotational motion into linear strokes in a perpendicular dimension. This dimensional transformation allows the motor to be positioned compactly while the striking unit extends in another direction to deliver full-range massage motions, effectively decoupling motor size from stroke amplitude.
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 improved massage functionality by increasing massage strength and flexibility, reducing fatigue and improving blood flow in the pelvis and waist areas, while maintaining a compact design and reducing noise compared to traditional pneumatic massage devices.
Implementation Method 1
an operation unit configured to convert a rotation force provided by the driving unit into a linear motion to linearly move the striking unit
Implementation Method 2
a driving unit providing a driving force for driving the striking unit... a brushless direct current (BLDC) motor
Data Source
AI summary
Proposed is a massage device which can be installed on a seat. The massage device includes a striking unit, a driving unit providing a driving force for driving the striking unit, and an operation unit configured to convert a rotation force provided by the driving unit into a linear motion to linearly move the striking unit.