Stator Core Thin-Wall Design for Iron Loss Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional stator cores for motors experience increased iron loss due to deviations between the easy magnetization direction and the flow direction of magnetic flux, particularly at the tooth tip end parts made of oriented electromagnetic steel sheets.
Innovation Solution
A stator core design incorporating a first core of non-oriented electromagnetic steel sheets with an insertion hole and a second core of oriented electromagnetic steel sheets, where the first core has a thin-wall part with a thickness between 0.5 and 2 times the sheet thickness of the non-oriented sheets, ensuring the magnetic flux flows optimally and reduces iron loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If oriented electromagnetic steel sheets are used in the tooth tip end part, then the iron loss is reduced when the easy magnetization direction coincides with the magnetic flux flow direction, but the iron loss increases greatly when there is a deviation between the easy magnetization direction and the magnetic flux flow direction
Solution Approach 1:
The invention divides the stator core into two distinct regions with different material properties: the tooth tip end part uses non-oriented electromagnetic steel sheets which have isotropic magnetic properties suitable for multi-directional flux, while the main body uses oriented electromagnetic steel sheets which have superior iron loss characteristics when the flux direction aligns with the easy magnetization direction. This local differentiation resolves the contradiction by matching material properties to the specific magnetic flux conditions in each region.
Solution Approach 2:
The stator core is constructed as a composite structure combining two types of electromagnetic steel sheets with different magnetic characteristics. The non-oriented steel sheets in the tooth tip end part provide adaptability to varying flux directions, while the oriented steel sheets in the main body minimize iron loss under aligned conditions. This composite approach allows the system to achieve both low iron loss and adaptability to magnetic flux direction variation.
2Loss of energy
If a thin-wall part with thickness between 0.5 and 2 times the sheet thickness is provided in the first core, then the iron loss is reduced by optimizing magnetic flux flow, but the structural strength may be compromised
Solution Approach 1:
The invention optimizes the thickness parameter of the thin-wall part within a specific range (0.5 to 2 times the sheet thickness) to achieve the best balance between iron loss reduction and structural strength. By controlling the thickness parameter within this optimized range, the magnetic flux flow is improved to reduce iron loss while maintaining sufficient structural integrity. This parameter optimization resolves the contradiction between energy efficiency and mechanical strength.
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 design reduces iron loss and enhances the efficiency of the motor, leading to lower power consumption in motors, compressors, and refrigeration air conditioners.
Implementation Method 1
the magnetic flux flows obliquely while curving in a tooth tip end part on an inner-radius side of the tooth part
Implementation Method 2
the easy magnetization direction and a flow direction of magnetic flux coincide with each other
Data Source
AI summary
A stator includes a first core including a plurality of non-oriented electromagnetic steel sheets that is stacked and having an insertion hole penetrating the plurality of non-oriented electromagnetic steel sheets in an axial direction of the stator and a second core arranged in the insertion hole and including a plurality of oriented electromagnetic steel sheets that is stacked. The first core has a thin-wall part adjoining the second core, and a conditional expression of 0.5tm≤ta≤2tm is satisfied, where ta denotes a thickness of the thin-wall part when the first core is viewed in the axial direction and tm denotes a sheet thickness of one non-oriented electromagnetic steel sheet in the plurality of non-oriented electromagnetic steel sheets.