Magnetic Transmission System Adaptive Stall Control
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Solution Overview
Problem
Existing magnetic gear systems lack dynamic and automatic control over stall conditions, leading to slip and inefficiencies when forces exceed the magnetic coupling limits, and current solutions either increase magnetic power costs or cause heating issues.
Innovation Solution
A magnetic transmission system with means to detect forces and control power supply to electric coils based on measured electromotive force, allowing for adaptive power management to adjust magnetic power and reduce heating, featuring ferromagnetic parts with permanent magnets and coils that can modify the force transmission ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the magnetic power is increased by providing a greater mass of magnet, then the magnetic coupling force is improved, but the cost increases because rare-earth magnets are expensive
Solution Approach 1:
The patent changes the magnetic configuration from a single large magnet to multiple smaller magnets arranged in specific patterns (radial, axial, or hybrid). This parameter change in magnetic architecture allows achieving the same coupling force with reduced total magnet mass, thereby lowering cost while maintaining force transmission capability.
Solution Approach 2:
The patent segments the magnetic system into multiple discrete magnets distributed across the rotor and stator components. Instead of one large magnet, multiple smaller magnets are used in arrays, which reduces the total rare-earth material required while maintaining the necessary magnetic coupling force through optimized spatial distribution.
2Power
If the electric current supplying the coils is increased during transient phases, then the magnetic power is improved, but heating occurs which is detrimental to the proper operation and degrades the performance of permanent magnets
Solution Approach 1:
The patent implements dynamic control of coil current based on real-time detection of stall conditions. The control system adjusts current levels adaptively - providing enhanced power only when stall is detected - rather than continuously high current. This dynamic approach delivers necessary magnetic power during transient phases while minimizing unnecessary heating that would degrade permanent magnet performance.
Solution Approach 2:
The patent incorporates feedback control through stall detection mechanisms that monitor the magnetic coupling state. When stall conditions are detected, the control system responds by adjusting coil current to prevent or resolve the stall. This feedback loop ensures magnetic power is increased only when and where needed, avoiding excessive heating while maintaining proper operation during normal phases.
3Reliability
If the magnetic coupling force is increased to prevent stall, then the reliability is improved, but the cost increases due to greater mass of rare-earth magnets
Solution Approach 1:
The patent changes the magnetic system architecture from relying on single large magnets to multiple smaller magnets with optimized distributions. This parameter change in configuration allows achieving sufficient magnetic coupling force for reliable stall prevention with reduced total magnet mass, thereby maintaining reliability while reducing cost.
Solution Approach 2:
The patent introduces electrically controllable coils as intermediary elements that augment the magnetic coupling force when needed. These coils work in conjunction with the permanent magnets, providing additional magnetic field strength during transient or high-load conditions to prevent stall, thereby reducing the reliance on excessive permanent magnet mass for reliability.
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 efficient and adaptive force transmission, reducing heating and maintaining magnetic performance by dynamically controlling power supply to the coils, thus preventing stall and improving system reliability.
Implementation Method 1
a first electrical winding assembly designed to produce, at least in part, a first magnetic flux
Implementation Method 2
They use the principle of a coupling between two moving parts not by mechanical gears but by a magnetic coupling between two teeth
Implementation Method 3
at least part of said parts consisting of a pole tooth supporting an electric coil
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention relates to a transmission system between an input shaft and an output shaft consisting of a driving ferromagnetic portion 2, a driven ferromagnetic portion 1 and an intermediate ferromagnetic portion 3, these three portions 1, 2, 3 being movable with respect to one another; - one of said portions 1 having N pairs of magnetic poles interacting with a second of said portions 3 having M ferromagnetic parts, where M•N; - said second portion 3 interacting with a third of said portions 2 having P pairs of poles; - at least one portion of said parts including a permanent magnet; - and at least one portion of said parts being made up of a polar tooth bearing an electrical coil, characterized in that said system additionally includes a means for detecting forces applied between said input shaft and said output shaft that is made up of a means for measuring the electromotive force flowing through at least one of said coils, and a means for controlling the supply of power to said electrical coils in order to control the magnetic power delivered by said permanent magnets and the polar teeth excited by electrical coils, according to a setpoint value and to the signal provided by said force detection means.