Magnetic Resistance Control via Motor-Driven Screw and Optical Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing resistance regulating devices for training machines, such as those using knobs and magnetic resistive-control devices, are not reliable and lack accurate resistance control, necessitating an improvement in the mechanism for adjusting flywheel resistance.
Innovation Solution
A resistance adjusting device comprising a stationary mechanism, a rotary mechanism with magnets, a motor, a screw, and a nut, along with an optical detection system and an emergency brake mechanism, which allows precise adjustment of resistance and ensures safety by detecting minimum and maximum resistance positions and triggering a stop signal to the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a knob and cable mechanism is used for resistance adjustment, then the device structure is simple, but the reliability and accuracy of resistance control are insufficient
Solution Approach 1:
The patent replaces the traditional mechanical knob and cable system with an electronic motor-driven system. The motor rotates the screw to precisely control the position of the magnetic resistive-control device, eliminating the reliability issues of mechanical cables and knobs while achieving accurate resistance adjustment through electronic control.
Solution Approach 2:
The patent incorporates a load sensing device that provides feedback on the resistance level. This feedback mechanism allows the system to accurately monitor and control the resistance, ensuring reliable resistance control by continuously sensing the load and adjusting accordingly through the motor-driven mechanism.
2Measurement precision
If a motor-driven screw mechanism is used, then the resistance control accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent replaces imprecise mechanical adjustment with a motor-driven screw mechanism that offers fine control over the position of the magnetic resistive-control device. The screw thread provides mechanical advantage and precise positioning, while the motor enables controlled, incremental adjustments for accurate resistance setting.
Solution Approach 2:
The patent controls resistance by precisely changing the positional parameter of the magnetic resistive-control device relative to the flywheel. The motor-driven screw mechanism enables fine adjustment of this position, allowing accurate control of the magnetic field interaction and thus the resistance level through parameter optimization.
3Measurement precision
If optical sensors are added for detecting resistance positions, then the control precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent uses optical sensors to detect the position of the magnetic resistive-control device and provide feedback to the control system. This enables precise determination of resistance levels and positions, allowing the motor to accurately adjust and maintain the desired resistance setting through continuous monitoring and adjustment.
Solution Approach 2:
The patent replaces mechanical position indicators with optical detection systems. The optical sensors non-contactingly detect the position of components, providing precise measurement without mechanical wear or contact, thereby improving measurement precision while reducing mechanical complexity.
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 solution provides precise and reliable resistance adjustment, enhancing the safety and accuracy of resistance control for training machines by using a motor-driven screw to change the distance between magnets and the wheel, and incorporating sensors for detecting resistance positions and an emergency brake mechanism for safety.
Implementation Method 1
The magnetic resistive-control device exerts a resistance on the flywheel
Implementation Method 2
the optical detection device comprises a control circuit board, a control member, a first sensor, and a second sensor
Data Source
AI summary
A resistance regulating device for a wheel of a training device is disclosed. The resistance regulating device comprises a rotary mechanism pivotally connected with a stationary mechanism and a motor with other components to rotate the rotary mechanism and hence a distance between magnets of the rotary mechanism and the wheel is changed. In addition, an optical detection device may be used to detect and define a minimum resistance and a maximum resistance and hence to adjust a resistance in a stepless manner. An emergency brake mechanism may be further employed.