Cable Resistance Trainer With MR Brake for 3D Load Control
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Solution Overview
Problem
Conventional training devices are unsuitable for efficient training of professional athletes as they restrict movement and do not effectively apply a load that mimics practical sport movements, limiting muscle coordination and load adjustment.
Innovation Solution
A training device with a cable system, a magneto-rheological fluid brake, and a controller that adjusts the braking force based on the cable's stroke amount and angle, allowing for dynamic load adjustment and movement in three-dimensional space, and a training system with multiple devices to control load direction and magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional training apparatus with fixed structure is used, then the load can be applied to a specific muscle or body part, but the movement form is restricted and cannot involve coordination of the muscles of the entire body
Solution Approach 1:
The patent extracts the load application mechanism from a fixed structural apparatus and separates it into an independent cable system. The cable can be paid out in various directions without being constrained by rigid structural connections, allowing free movement while maintaining load application capability. This resolves the contradiction by removing the restrictive structural elements while preserving the essential training function.
Solution Approach 2:
The cable-based system serves multiple functions: it applies load, allows free movement in three-dimensional space, and can be used for various sport-specific training movements. The same cable mechanism adapts to different training scenarios without requiring structural modification, achieving versatility without increasing device complexity.
2Adaptability or versatility
If a conventional training apparatus with fixed load is used, then the apparatus structure is simple, but the load cannot be dynamically adjusted during movement to match practical sport movements
Solution Approach 1:
The patent implements dynamic load adjustment by controlling the braking force of the magneto-rheological fluid brake based on real-time stroke amount feedback. The braking force changes dynamically during movement rather than remaining fixed, allowing the load to adapt to practical sport movement requirements. This dynamic control is achieved through a feedback loop that measures stroke amount and adjusts braking force accordingly.
Solution Approach 2:
The system uses a measurer to detect the stroke amount of the cable and feeds this information back to the controller. The controller then adjusts the braking force based on the feedback signal, creating a closed-loop control system. This feedback mechanism enables automatic load adjustment without requiring complex manual intervention or overly complicated device architecture.
3Productivity
If a magneto-rheological fluid brake is used to apply braking force to the cable, then the load magnitude can be adjusted, but the device complexity increases due to the need for stroke amount measurement and control systems
Solution Approach 1:
The measurer automatically detects the stroke amount of the cable during movement and provides this information to the controller without requiring external measurement devices or manual input. The system serves itself by using the movement data to automatically adjust the braking force, eliminating the need for additional complex measurement and control infrastructure.
Solution Approach 2:
The patent replaces traditional mechanical load adjustment mechanisms (such as weight stacks or spring systems) with a magneto-rheological fluid brake controlled by electromagnetic fields. This substitution allows for smoother, more precise load adjustment and enables dynamic control during movement. The mechanical complexity of traditional load adjustment systems is replaced with a more compact and controllable electromagnetic braking system.
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
Enables efficient training that mimics practical sport movements by dynamically adjusting load magnitude and direction, improving muscle coordination and performance.
Implementation Method 1
a rotating body that rotates in response to rotation operation of the handle by a trainee is placed in an electro-rheological or magneto-rheological fluid, and the load experienced by the user is adjusted by controlling magnitude of electricity or magnetism applied to the viscous fluid to control viscous resistance against the rotation
Data Source
AI summary
A training device includes, a cable that is paid out in response to movement of a user, a reel on which the cable is wound, a rotary encoder to detect a rotation state of the reel, a magneto-rheological fluid brake to apply a braking force to the reel, and a controller configured or programmed to calculate a stroke amount of the cable based on an output value of the rotary encoder and to control the braking force based on the stroke amount to change a magnitude of a load during the movement.