Bicycle Trainer Electromagnetic Feedback for Stable Resistance
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Solution Overview
Problem
Conventional bicycle training devices with electricity-generating hubs face limitations in power generation due to single coil arrangements, and magnetism-based resistance systems suffer from temperature-induced reductions in resistance force, necessitating a solution for self-supply of electrical power and self-adjustment of resistance levels.
Innovation Solution
An electromagnetic resistance feedback system featuring a bicycle trainer frame with an integrated electricity generator, transmission system, electromagnetic resistance generation unit, feedback circuit, and control unit that uses multiple concentric electricity generation units and pulse width modulation to maintain a predetermined electromagnetic field strength, enabling self-supply and self-adjustment of resistance force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single electricity-generating coil is used in the hub, then the device structure remains simple, but the electricity generation capacity is limited
Solution Approach 1:
The electricity-generating coil is divided into multiple independent coil units (first coil unit, second coil unit, third coil unit, fourth coil unit) arranged around the hub. Each coil unit can independently generate electricity, and their outputs are combined through rectification circuits to achieve higher total power generation capacity while maintaining modular simplicity
Solution Approach 2:
Multiple coil units are nested around the hub in a concentric arrangement, with each coil unit positioned at different angular locations. This nested configuration allows maximum utilization of the available space around the hub, enabling multiple coils to coexist without significantly increasing the overall device footprint
2Force
If magnetism resistance is used to increase pedaling resistance, then training effectiveness improves, but temperature increase causes reduction in magnetic force and resistance
Solution Approach 1:
A feedback control system is implemented with sensors that continuously monitor the actual resistance force and temperature. The control unit compares the actual resistance with the target resistance and adjusts the electromagnetic resistance generation unit in real-time to compensate for temperature-induced magnetic force reduction, maintaining consistent training resistance throughout the exercise session
Solution Approach 2:
The system dynamically changes operational parameters including electromagnetic field strength, coil current, and resistance level based on real-time temperature and performance data. As temperature increases and magnetic force decreases, the system increases the electrical current through the electromagnetic resistance generation unit to maintain the required resistance force, effectively compensating for thermal effects
3Adaptability or versatility
If electromagnetic resistance generation unit is added to the system, then resistance control capability improves, but system complexity and power consumption increase
Solution Approach 1:
The electromagnetic resistance generation unit serves multiple functions: it provides adjustable pedaling resistance for training, generates electrical power through electromagnetic induction during pedaling, and acts as part of the feedback control system. This multi-functionality reduces the need for separate components and justifies the added complexity by delivering multiple benefits from a single integrated unit
Solution Approach 2:
The system is designed to be self-powered, where the electricity generated by the multiple coil units during normal pedaling operations is sufficient to power the electromagnetic resistance generation unit and the control electronics. This self-service capability eliminates the need for external power sources or batteries, reducing overall system complexity despite the addition of the electromagnetic resistance unit
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 system effectively increases electricity generation capacity without size expansion, maintains consistent resistance force across varying temperatures, and allows for external control of resistance parameters, enhancing training effectiveness.
Implementation Method 1
an electricity generator, which is mounted to the bicycle trainer frame... when the rotor rotates with a wheel axle, the permanent magnet and the electricity-generating coil induce and generate electricity
Implementation Method 2
an electromagnetic resistance generation unit, which is excitable by an electrical current to generate an electromagnetic field that induces an electromagnetic resistance force to a rotating object
Data Source
AI summary
An electromagnetic resistance feedback bicycle training device includes a bicycle trainer frame, an electricity generator, and a resistance feedback system. The electricity generator and the resistance feedback system are mounted on the bicycle trainer frame. The resistance feedback system includes a transmission system connectable to an external electronic device, an electromagnetic resistance generation unit operable to induce an electromagnetic resistance force to a rotating object, a feedback circuit, and a control unit. The control unit detects, by means of an electromagnetic detection element of the feedback circuit, a strength of an electromagnetic field generated by the electromagnetic resistance generation unit, and, in response to the strength of the electromagnetic field, adjusts a level of the electromagnetic resistance force generated by the electromagnetic resistance generation unit. As such, the present invention enables self-generation of electricity and self-supply of electrical power without connection with an external power source and features instantaneous feed-back of electromagnetic resistance force and self-adjustment for maintaining a constant level of the electromagnetic resistance force.