Planar Motor Stator Core Segmentation for Loss Reduction
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Solution Overview
Problem
The manufacturing process of planar type motors is complex and costly due to the need for molding silicon steel plates of different sizes, and using integrated cores made of soft magnetic powder results in high core loss and degraded magnetic properties.
Innovation Solution
A stator design for planar type motors that uses a support plate with receiving grooves for inserting first cores formed of soft magnetic powder and second cores formed by stacking electric steel plates, minimizing core loss and torque ripples by optimizing core arrangement and winding spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon steel plates of different sizes are molded and stacked to form cores, then magnetic properties are improved, but manufacturing process complexity increases and manufacturing cost increases
Solution Approach 1:
The core is divided into multiple segments corresponding to different winding spaces, with each segment having optimized magnetic path length. This segmentation allows using uniform-sized silicon steel plates for all segments, simplifying the manufacturing process while maintaining good magnetic properties in each segment.
2Ease of manufacture
If integrated cores made of soft magnetic powder are used, then manufacturing ease is improved, but core loss increases and magnetic properties are degraded
Solution Approach 1:
The patent uses composite construction by stacking multiple thin silicon steel plates with insulation coatings. This composite structure reduces eddy current losses compared to integrated soft magnetic powder cores, while the standardized plate sizes maintain manufacturing efficiency.
3Ease of manufacture
If uniform-sized silicon steel plates are stacked for all cores, then manufacturing process is simplified, but magnetic path length varies causing torque ripples
Solution Approach 1:
Different core segments are designed with different numbers of silicon steel plates stacked, creating local variations in magnetic path length. This allows uniform plate sizes to be used throughout while achieving optimized magnetic paths in each local region, reducing torque ripples.
4Volume of moving object
If cores are arranged closely to minimize spaces, then motor size is reduced, but winding space becomes insufficient
Solution Approach 1:
The core is segmented into multiple sections corresponding to different winding spaces. This segmentation creates dedicated spaces for winding coils in each segment, allowing efficient use of space while providing sufficient room for winding operations.
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 design simplifies manufacturing, reduces core loss, and enhances magnetic performance by separating first and second cores and winding coils around them, minimizing torque ripples and spaces between adjacent cores.
Implementation Method 1
a stator configured to generate a magnetic field
Implementation Method 2
The planar type motor generates a repulsive or attractive force between the permanent magnets of the cores and the rotor to generate rotational torque
Data Source
AI summary
The described technology relates to a stator of a planar type motor and a planar type motor using the same, which are easy to manufacture and are capable of reducing core losses, thereby maximizing motor performance. First cores that are difficult to form by stacking electrical steel plates are formed of soft magnetic powders, and second cores that are formed by stacking electrical steel plates having the same size are arranged in a region where a vortex is concentrated, thereby allowing easy manufacture and being capable of maximizing the performance of the planar type motor.