Composite Magnetic Pole Piece Support for Mechanical Load Resistance
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Solution Overview
Problem
Magnetic pole-piece support structures in magnetic gears and machines face challenges with mechanical strength due to large mechanical loads, radial magnetic pull, and torsional forces, leading to potential failure and reduced efficiency from eddy currents and heat management issues, especially as machine length increases.
Innovation Solution
The use of non-magnetic, composite support structures such as carbon fibre pultrusions and engineering plastics with shaped pole pieces and reinforcement bars, along with adhesive bonding and tensioned elements, to enhance mechanical integrity and reduce deflections while minimizing magnetic flux disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional magnetic pole-piece support structures are used, then the structure is simple and easy to manufacture, but the mechanical strength is insufficient under large mechanical loads, radial magnetic pull, and torsional forces
Solution Approach 1:
The patent employs composite support structures combining non-magnetic materials (such as carbon fiber, fiberglass, or non-magnetic metals) with magnetic pole pieces. This composite approach provides enhanced mechanical strength to withstand large mechanical loads, radial magnetic pull, and torsional forces while maintaining magnetic field integrity and preventing eddy current losses.
2Power
If the machine length increases, then the torque transmission capability increases, but the deflections and mechanical failures increase
Solution Approach 1:
The patent divides the support structure into multiple discrete support elements or segments distributed along the length of the magnetic pole pieces. This segmentation allows each support element to independently bear local loads, reducing overall deflections and preventing catastrophic failure across the entire structure, thereby maintaining reliability in longer machines with higher torque transmission requirements.
3Loss of energy
If non-magnetic support structures are used, then eddy current losses are reduced, but the mechanical strength under combined loads is insufficient
Solution Approach 1:
The patent uses non-magnetic composite materials (carbon fiber, fiberglass, or non-magnetic metals) for the support structures. These materials inherently prevent eddy current formation by breaking magnetic flux continuity, eliminating energy losses while providing sufficient mechanical strength through their composite construction to withstand combined mechanical loads, radial magnetic pull, and torsional forces.
4Productivity
If the pole pieces are closely spaced to improve gear ratio, then the efficiency increases, but the mechanical loads and radial magnetic pull increase
Solution Approach 1:
The patent employs non-magnetic composite support structures that can withstand the increased mechanical stress and radial magnetic pull resulting from closely spaced pole pieces. These composite materials provide the necessary structural integrity to maintain the high-efficiency compact pole piece arrangement without suffering from mechanical failure under the intensified loads.
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 provides improved mechanical strength, reduced deflections, and efficient heat management by using composite materials and structural designs that maintain magnetic performance, preventing electrical breakdowns and enhancing the reliability of magnetic gear systems.
Implementation Method 1
minimizing magnetic flux disruptions
Implementation Method 2
reduced efficiency from eddy currents
Implementation Method 3
adhesive bonding
Data Source
Figure 1
Figure 2
Figure 3~4b
AI summary
A pole piece support comprising a frame having a spaced array of non- magnetic support structures (606), wherein disposed between at least a pair of adjacent non-magnetic support structures (606) is a magnetic pole piece (604) supported along at least a portion of its body by the adjacent non-magnetic support structures (606).