Moving Magnet Motor Alignment Using Ferromagnetic Side-Load Compensation
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Solution Overview
Problem
Linear moving magnet or reluctance motors experience motor side loads due to mis-alignment of components, leading to wear and deterioration of the cylinder wall and rider, which are costly and unreliable to align accurately.
Innovation Solution
A moving magnet motor system with ferromagnetic rods positioned to interact magnetically with the magnetic ring, allowing adjustable alignment to counteract side loads, using rods that can be selectively positioned to offset or minimize bearing side forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tight dimensional tolerances and alignment of motor components are used to magnetically center the magnet ring, then motor side loads are reduced, but manufacturing cost and time increase
Solution Approach 1:
Ferromagnetic rods are introduced as intermediary components between the magnet ring and the cylinder wall. These rods act as magnetic mediators that generate corrective magnetic forces to counteract side loads, eliminating the need for tight mechanical tolerances and complex alignment procedures while maintaining motor reliability
Solution Approach 2:
The patent replaces the mechanical alignment system (which requires precise dimensional tolerances and component alignment) with a magnetic field-based system using ferromagnetic rods. This substitution allows side load compensation through magnetic forces rather than mechanical precision, reducing manufacturing complexity and cost
2Reliability
If ferromagnetic rods are added to the motor system, then side load compensation is improved, but device complexity increases
Solution Approach 1:
The ferromagnetic rods serve multiple functions: they act as magnetic conductors to guide flux, generate corrective magnetic forces to counteract side loads, and can be positioned to compensate for various types of misalignment. This multi-functionality justifies their addition by providing multiple benefits from a single component type
Solution Approach 2:
The position and configuration of the ferromagnetic rods can be adjusted to optimize side load compensation for different operating conditions and misalignment scenarios. This adjustability allows the system to adapt to various situations without requiring fundamentally different designs, managing complexity through parameter optimization rather than structural 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 system effectively reduces motor side loads by adjusting the ferromagnetic rods' position, enhancing motor alignment and reducing wear, thus improving reliability and efficiency.
Implementation Method 1
one or more ferromagnetic rods extending parallel to the cylindrical axis... positioned to interact magnetically with the magnetic ring
Implementation Method 2
configured to interact with the magnetic field generated by the coil to impart linear force to the rider
Data Source
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.