Magnetic Resistance Control Structure for Exercise Machines
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Solution Overview
Problem
Conventional exercise machines experience energy loss due to the resistance in the material of the exciting coil when generating magnetic force, limiting the efficiency of magnetic resistance control.
Innovation Solution
An electric magnetic resistance control structure comprising a base, flywheel, power unit, and control unit, where a magnetic resistance unit with a rotating lead screw and sliding blocks adjusts the overlapping area with a non-magnetically sensitive layer to control magnetic resistance, using a small current to actuate the power unit and eliminate energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electric current is used to generate magnetic force through exciting coil, then magnetic resistance control is achieved, but energy loss occurs due to resistance in coil material
Solution Approach 1:
The patent extracts and removes the exciting coil component that causes energy loss through resistive heating. Instead of using electromagnetic induction with coils, the invention directly applies permanent magnets to generate magnetic fields, eliminating the source of energy dissipation while maintaining magnetic resistance control functionality
Solution Approach 2:
The patent replaces the electromagnetic system (electric current through coil generating magnetic field) with a direct magnetic system (permanent magnets generating magnetic field). This substitution eliminates the need for continuous electrical energy input and removes the resistive losses inherent in electromagnetic systems
2Measurement precision
If magnetic resistance is adjusted by changing overlapping area, then resistance control precision is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements a dynamic adjustment mechanism where the magnetic resistance unit can move relative to the flywheel along the axial direction. This dynamic positioning allows continuous variation of the overlapping area between magnetic members and the non-magnetically sensitive layer, enabling precise resistance control through mechanical displacement rather than complex electronic control systems
Solution Approach 2:
The patent controls magnetic resistance by changing the physical parameter of overlapping area between magnetic components. By adjusting the axial position of the magnetic resistance unit, the degree of overlap between magnetic members and the non-magnetically sensitive layer varies continuously, providing precise resistance control through a single geometric parameter
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
This solution allows for efficient adjustment of magnetic resistance without energy loss, providing various control modes for exercise training, including stepless and multi-stage resistance changes, enhancing user experience by automating resistance adjustments.
Implementation Method 1
The magnetic member is kept at a distance from the non-magnetically sensitive layer to generate a magnetic resistance effect
Implementation Method 2
The power unit includes a rotatable lead screw extending along the axial direction... The power unit is an electric motor configured to drive the lead screw to rotate
Data Source
AI summary
An electric magnetic resistance control structure for an exercise machine includes a base; a flywheel, pivotally connected to the base through a rotating shaft, the rotating shaft defining an axial direction, the flywheel, a non-magnetically sensitive layer being coupled to a circumference of the flywheel; a power unit, fixed to the base; a magnetic resistance unit, including a coupling portion corresponding to an arc of the non-magnetically sensitive layer, at least one magnetic member being provided on the coupling portion and kept at a distance from the non-magnetically sensitive layer to generate a magnetic resistance effect; a control unit, configured to control a current applied to the power unit to drive the magnetic resistance unit to move along the axial direction, thereby changing an overlapping area of the magnetic member and the non-magnetically sensitive layer in the axial direction, so as to adjust a magnetic resistance of the flywheel.