Soft Magnetic Wire Arrays for Motor Cores With Lower Eddy Loss
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Solution Overview
Problem
Existing electric motors face challenges in increasing power density and reducing eddy current losses due to the brittle nature of advanced soft magnetic materials (SMM) and the inefficiency of conventional laminate designs, which limit magnetic flux utilization and thermal management.
Innovation Solution
The use of ductile soft magnetic wires and strips, produced through rapid solidification techniques like melt spinning, are arranged in arrays to form magnetic flux pathways and are coated with insulating binders to create efficient stator or rotor segments, allowing for improved magnetic flux concentration and cooling channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If advanced soft magnetic materials (amorphous alloy or nanocrystalline alloys) are used to reduce eddy current losses, then electrical resistance increases and power density improves, but the materials become extremely difficult to fabricate and assemble due to their brittle nature
Solution Approach 1:
The patent divides the soft magnetic material into thin laminates (0.1-0.5mm thickness) with insulating coatings, creating segmented structures that reduce eddy current paths while maintaining manufacturability. This segmentation allows the brittle material to be handled as discrete, manageable pieces rather than large monolithic structures.
Solution Approach 2:
The patent creates composite structures by combining soft magnetic material laminates with insulating coatings and resin impregnation. This composite approach provides both the electrical resistance benefits of advanced SMM and the mechanical flexibility needed for fabrication, as the resin matrix compensates for the brittleness of the magnetic material.
2Loss of energy
If SMM laminate thickness is reduced to minimize eddy current losses at high operating frequency, then power density improves, but magnetic flux density and packing density are reduced due to minimum insulating coating thickness requirements
Solution Approach 1:
The patent optimizes the thickness parameter of SMM laminates (0.1-0.5mm range) to find the optimal balance between reducing eddy current losses and maintaining sufficient magnetic flux density. This parameter optimization ensures that the insulating coating thickness does not excessively reduce the active magnetic volume.
Solution Approach 2:
The patent uses resin impregnation to copy and fill the spaces between laminates, creating a dense packed structure that maximizes the use of available space for magnetic material while maintaining electrical isolation. The resin acts as a space-filling medium that allows tighter packing of thin laminates.
3Power
If motor speed is increased to improve power density, then power output increases, but efficiency decreases due to increased eddy current losses in soft magnetic materials
Solution Approach 1:
The segmented laminate structure with insulating coatings creates multiple isolated eddy current paths, effectively reducing the magnitude of circulating currents at high frequencies. This segmentation allows the motor to operate at higher speeds with minimal eddy current penalty.
Solution Approach 2:
The patent applies insulating coatings specifically at the laminate surfaces where eddy currents would form closed loops, providing local electrical isolation precisely where needed to suppress eddy currents while leaving the bulk magnetic material properties unchanged for optimal flux conduction.
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 approach enhances power density and energy efficiency by minimizing eddy current losses and optimizing magnetic flux utilization, while overcoming the brittleness issues of advanced SMM materials.
Implementation Method 1
produced through rapid solidification techniques like melt spinning
Implementation Method 2
rapid solidification techniques like melt spinning
Implementation Method 3
The wires and/or strips can be coated with electrical insulating material
Implementation Method 4
The most significant energy loss of SMM is the eddy current losses caused by the induced currents on changing magnetic fields
Implementation Method 5
disposed in arrays (shapes) to form desired stator or rotor magnetic flux pathways for boosting the magnetic field generated by copper windings
Implementation Method 6
soft magnetic materials (SMM) and insulating materials
Data Source
AI summary
A novel architecture for al motor rotor and stator of an electrical motor device as well as other electromagnetic device using soft magnetic wires and/or strips bundled and shaped to provide a desired magnetic flux path.