Moving Magnet Motor Centering With Adjustable Ferromagnetic Rods
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Solution Overview
Problem
Moving magnet and linear reluctance motors face significant motor side loads due to misalignment of components and non-uniform magnetization, leading to wear and deterioration of the cylinder wall and rider, which is costly and unreliable to address with current methods.
Innovation Solution
The introduction of a moving magnet motor system with positionally adjustable ferromagnetic rods that interact with the magnetic ring to generate an auxiliary force, reducing side loads by magnetic communication and alignment, allowing for precise positioning to counteract bearing side loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tight dimensional tolerances and alignment methods are used to magnetically center the magnet ring, then motor side loads are reduced, but manufacturing cost and time increase significantly
Solution Approach 1:
The ferromagnetic rods automatically adjust their positions along the cylindrical axis to magnetically center the magnet ring, eliminating the need for external alignment tools and tight manufacturing tolerances. The system self-regulates to minimize side loads without requiring expensive precision manufacturing processes.
Solution Approach 2:
The invention changes the magnetic field distribution parameters by introducing ferromagnetic rods at specific locations, which alters the magnetic circuit to automatically center the magnet ring. This parameter change enables side load reduction without requiring tight dimensional tolerances on motor components.
2Reliability
If ferromagnetic rods are added to magnetically center the magnet ring, then manufacturing complexity increases, but side load reduction becomes more effective
Solution Approach 1:
Ferromagnetic rods are introduced as intermediary components between the magnet ring and the magnetic field source. These rods mediate the magnetic interaction to achieve centering, adding only simple ferromagnetic elements rather than complex alignment mechanisms.
Solution Approach 2:
The invention replaces mechanical alignment methods (which would require tight tolerances and complex mechanical structures) with a magnetic field-based centering system using ferromagnetic rods. This substitution eliminates the need for complex mechanical alignment while achieving the same centering effect.
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 effectively minimizes side loads and improves the alignment of motor components, reducing wear and enhancing the reliability and efficiency of the motor system, suitable for applications like Stirling engines and coolers.
Implementation Method 1
one or more ferromagnetic rods in magnetic communication with the magnetic ring
Implementation Method 2
one or more ferromagnetic rods extending parallel to the cylindrical axis
Implementation Method 3
a coil configured to generate a magnetic field, a magnetic ring affixed to the magnetic ring support and comprising a plurality of magnets configured to interact with the magnetic field generated by the coil to impart linear force to the rider
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A moving magnet motor system including a cylinder having a cylindrical axis and a rider disposed within the cylinder, wherein the rider moves longitudinally along the cylindrical axis within the cylinder. The moving magnet motor system further including a coil configured to generate an electromagnetic field, a magnet ring support structure affixed to the rider and a magnetic ring affixed to the magnet ring support structure and comprising a plurality of magnets configured to interact with the magnetic field generated by the coil to impart linear force to the rider. The moving magnet motor system further includes one or more ferromagnetic rods extending parallel to the cylindrical axis wherein the ferromagnetic rod(s) are configured to minimize or offset a bearing side load.