Treadmill Motor Current Sensor for Ground Reaction Force Detection
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Solution Overview
Problem
Conventional methods for determining dynamic parameters during running, such as using high-speed cameras and force measurement boards, are inconvenient, time-consuming, and require professional expertise, often failing to provide real-time feedback.
Innovation Solution
A reaction force detection system for treadmills that includes current sensors, a central processing electronic circuit assembly, and a transmission circuit to calculate and transmit vertical and horizontal ground reaction force peaks based on motor current data, allowing for real-time dynamic parameter output without external instruments or professional intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional instruments (high-speed cameras, force measurement boards) are used to obtain dynamic parameters, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent extracts the measurement function from complex external instruments and integrates it into the treadmill's existing motor control system. By utilizing the motor's current sensor to detect reaction forces, the system eliminates the need for separate force measurement boards and high-speed cameras, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The treadmill motor serves multiple functions: it drives the running belt and simultaneously acts as a sensor for detecting ground reaction forces through current measurement. This multi-functionality approach allows the same component to perform both propulsion and measurement tasks, reducing the overall number of devices needed
2Measurement precision
If conventional instruments are used to obtain dynamic parameters, then measurement precision is improved, but ease of operation deteriorates due to professional processing requirements
Solution Approach 1:
The system performs self-service by automatically processing the raw current data from the motor sensor through embedded algorithms. The microcontroller directly calculates dynamic parameters from the current signals without requiring external professional processing, making the system easy to operate for users without specialized knowledge
Solution Approach 2:
The patent replaces manual professional data processing with automated electronic computation. The microcontroller electronically processes the current signals in real-time, substituting the need for professional sport science staff to manually interpret and translate data, thereby dramatically improving ease of operation
3Measurement precision
If conventional instruments are used to obtain dynamic parameters, then measurement precision is improved, but loss of time increases due to post-processing requirements
Solution Approach 1:
The system performs preliminary action by calculating and preparing the dynamic parameters in real-time during the exercise session itself. Rather than waiting for post-processing after the exercise, the microcontroller continuously computes the parameters from the current data, making the results immediately available without time loss
4Ease of operation
If treadmill motor current data is used to detect reaction forces, then ease of operation and real-time feedback are improved, but measurement precision may deteriorate
Solution Approach 1:
The patent uses the motor current as an intermediary measurement that indirectly reflects ground reaction forces. Instead of directly measuring forces with complex sensors, the system measures the electrical current required to maintain belt speed, which serves as a proxy for the reaction forces exerted by the user, achieving a balance between simplicity and accuracy
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 real-time capture and analysis of dynamic parameters during exercise, reducing the need for external instruments and professional processing, making the technology more accessible and user-friendly for public use.
Implementation Method 1
one or more current sensors, which are applied to detect the current data generated by a user running on the running belt
Data Source
AI summary
A reaction force detection system for treadmills and detection method thereof is disclosed, wherein the system detects the current data generated by a user running on a treadmill comprising a running belt, a motor and an electronic circuit device by means of a current sensor, and then determines a current peak based on the current data, such that a ground reaction force peak can be determined according to the acquired current peak. Therefore, the present invention allows to determine the ground reaction force of the human body during running through the changes of the motor current signals inside the treadmill, such that these parameters can be further presented, analyzed, and stored in order to provide more scientific feedbacks for running trainings.