Stator Core Tooth Width Layout for Lower Iron Loss
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Solution Overview
Problem
Existing stator core designs for rotary electric machines face challenges in reducing variations in magnetic flux density, leading to increased iron loss.
Innovation Solution
The stator core design involves laminating electrical steel sheets with tooth widths adjusted based on magnetic characteristics, where teeth with excellent magnetic characteristics have narrower widths than those with poor magnetic characteristics, and the product of tooth width and magnetic flux density is kept constant across teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrical steel sheets with anisotropic magnetic characteristics are laminated to form a stator core, then the manufacturing process is simple and cost-effective, but the magnetic flux density distribution becomes uneven and iron loss increases
Solution Approach 1:
The patent applies local quality by varying the tooth width according to the magnetic characteristics at different positions. Teeth with favorable magnetic characteristics have larger widths, while teeth with poor magnetic characteristics have smaller widths. This local adaptation of geometry compensates for the anisotropic magnetic properties of the electrical steel sheets, achieving uniform magnetic flux density distribution without changing the material itself.
Solution Approach 2:
The patent changes the geometric parameter (tooth width) to compensate for magnetic property variations. By adjusting the width parameter of teeth based on their magnetic characteristics, the patent achieves uniform magnetic flux density distribution, thereby reducing iron loss while maintaining the use of anisotropic electrical steel sheets.
2Loss of energy
If the path dimension for magnetic flux is varied to compensate for magnetic characteristics, then the magnetic flux density distribution improves, but the determination of yoke shape becomes complex and difficult
Solution Approach 1:
The patent segments the stator core into multiple teeth, each with independently optimized widths. Instead of attempting to optimize the entire yoke shape as a single complex component, the invention divides the problem into manageable tooth units, where each tooth's width can be independently adjusted based on its specific magnetic characteristics, simplifying the overall design process.
Solution Approach 2:
The patent applies local quality by varying the tooth width according to the magnetic characteristics at different positions. Teeth with favorable magnetic characteristics have larger widths, while teeth with poor magnetic characteristics have smaller widths. This local adaptation of geometry compensates for the anisotropic magnetic properties of the electrical steel sheets, achieving uniform magnetic flux density distribution without changing the material itself.
3Ease of manufacture
If the surface area of magnetic pole teeth is reduced in certain directions, then the manufacturing cost decreases, but the magnetic flux flow may be hindered in directions where it is already difficult
Solution Approach 1:
The patent applies local quality by varying the tooth width according to the magnetic characteristics at different positions. Teeth with favorable magnetic characteristics have larger widths, while teeth with poor magnetic characteristics have smaller widths. This local adaptation of geometry compensates for the anisotropic magnetic properties of the electrical steel sheets, achieving uniform magnetic flux density distribution without changing the material itself.
Solution Approach 2:
The patent changes the geometric parameter (tooth width) to compensate for magnetic property variations. By adjusting the width parameter of teeth based on their magnetic characteristics, the patent achieves uniform magnetic flux density distribution, thereby reducing iron loss while maintaining the use of anisotropic electrical steel sheets.
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 effectively reduces variations in magnetic flux density, thereby suppressing iron loss and improving the efficiency of rotary electric machines.
Implementation Method 1
The magnetic characteristics of electrical steel sheets are generally anisotropic in the sheet surfaces. In particular, grain-oriented electrical steel sheets have a large anisotropy of magnetic characteristics, and the magnetic characteristics in a rolling direction are extremely more favorable than those in other directions.
Implementation Method 2
the magnetic flux density in the stator core varies, and the iron loss becomes large
Data Source
AI summary
The present invention is a stator core having a plurality of laminated electrical steel sheets, in which, among a plurality of teeth (121a to 121p) of the stator core, a width of teeth along a direction in which magnetic characteristics are excellent may be narrower than a width of teeth along a direction in which the magnetic characteristics are poor.