Stationary Ergometric Exercise Device Dynamic Resistance Control
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Solution Overview
Problem
Existing stationary ergometric exercise devices lack the ability to dynamically adjust resistance to simulate various cycling conditions and provide real-time feedback for optimal user performance, relying on manual adjustments and less efficient magnetic braking systems.
Innovation Solution
A stationary ergometric exercise device equipped with a magnetic rim flywheel, a motor-driven brake system using permanent magnets, a measuring unit for force and torque, and a command module that adjusts braking force based on real-time performance data to match predetermined profiles, allowing for dynamic resistance adjustment and connectivity with external devices for performance tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of brake position is used, then device complexity is reduced, but adaptability and real-time performance adjustment are worsened
Solution Approach 1:
The system automatically adjusts brake position based on real-time performance measurements without user intervention. The command module receives measurements from measuring units, compares them to target values, and controls the motor to adjust permanent magnet positions automatically, enabling the device to self-regulate resistance levels.
Solution Approach 2:
The system implements closed-loop feedback by continuously measuring performance parameters (force, torque, power), comparing them against target values, and using the error signal to adjust brake position. This feedback mechanism enables real-time adaptation of resistance to maintain optimal workout conditions.
2Use of energy by moving object
If permanent magnets are used instead of electro-magnets, then power consumption is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The system replaces electro-magnetic braking with permanent magnet-based magnetic braking. By eliminating the need for electrical power to generate the magnetic field, power consumption is dramatically reduced while maintaining effective brake force through the inherent magnetic properties of permanent magnets.
Solution Approach 2:
The system changes the fundamental parameter of magnetic field generation from electrical current (electro-magnet) to permanent magnetic material. This parameter change reduces power consumption to near-zero levels while requiring precise manufacturing and positioning to optimize the magnetic interaction between permanent magnets and the magnetic rim.
3Adaptability or versatility
If dynamic brake adjustment is implemented, then adaptability to different cycling conditions is improved, but device complexity increases
Solution Approach 1:
The command module serves multiple functions: it receives data from measuring units, processes performance measurements, compares against target values, calculates required brake adjustments, and controls the motor. This multi-functional approach consolidates control logic into a single unit, reducing overall system complexity while enabling dynamic adaptation to various cycling conditions.
Solution Approach 2:
The command module acts as an intermediary between the measuring units and the brake control motor. It processes information from sensors and translates it into appropriate motor control signals, simplifying the control architecture by providing a centralized intelligence layer that coordinates all dynamic adjustment functions.
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 precise control of resistance to simulate diverse cycling conditions, enhances user performance by adjusting resistance in real-time, and reduces power consumption while providing detailed performance feedback, making it suitable for medical and training applications.
Implementation Method 1
a brake device in the form of one or more permanent magnets mounted for movement by means of a motor towards and away from the magnetic rim of the flywheel so as to selectively adjust a braking force applied to the flywheel by means of the one or more permanent magnets
Implementation Method 2
one or more permanent magnets mounted for movement by means of a motor towards and away from the magnetic rim of the flywheel
Data Source
AI summary
A stationary exercise device comprises pedals mounted via cranks to opposite sides of a drive wheel; a flywheel with a magnetic rim coupled to the drive wheel; a brake with a motor and one or more permanent magnets mounted for movement relative to the magnetic rim; a measuring unit for measuring at least one of the drive force applied via the drive wheel and the related torque; a measuring device for measuring cadence; and a command module. The command module uses measurements from the measuring unit and the measuring device to calculate a performance parameter and compares the performance parameter against a predetermined performance profile. The command module also can control the motor to move the permanent magnets relative to the magnetic rim to adjust the braking force applied and thereby adjust the performance parameter to conform with the performance profile.