Wind Generator Stator Iron Core Harmonic Reduction
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Solution Overview
Problem
Large permanent magnet generators face increased manufacturing and transportation costs due to larger dimensions, and single-layer winding structures with integral pitch designs fail to effectively reduce fifth and seventh harmonic magnetic fields, leading to excessive torque ripple and noise.
Innovation Solution
A stator iron core with a split structure and a single-layer winding arrangement, where the number of slots per pole per phase is one, and two three-phase winding units are arranged with a 30-degree electrical angle difference, reducing fifth and seventh harmonic magnetomotive forces and torque ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stator iron core is split to reduce manufacturing and transportation costs, then the manufacturing cost and transportation cost decrease, but the single-layer winding structure with integral pitch design cannot effectively reduce fifth and seventh harmonic magnetic fields, resulting in increased torque ripple and vibration noise
Solution Approach 1:
The patent divides the single-layer winding into multiple independent winding sections, each with different pitch values. This segmentation allows different sections to target different harmonic frequencies, enabling effective reduction of both fifth and seventh harmonics while maintaining the cost benefits of a split stator iron core structure.
Solution Approach 2:
Different sections of the winding are assigned different pitch characteristics tailored to specific harmonic reduction needs. The first winding section uses a pitch designed to reduce fifth harmonics, while the second winding section uses a different pitch for seventh harmonics, creating localized optimization throughout the winding structure.
2Device complexity
If the single-layer winding adopts integral pitch design, then the manufacturing complexity is reduced, but it is unable to effectively reduce the content of fifth and seventh harmonic magnetic fields, resulting in great torque ripple
Solution Approach 1:
The winding structure is segmented into multiple sections with distinct pitch values, allowing each section to address specific harmonic issues without requiring complete redesign of the entire winding system, thus balancing complexity and performance.
Solution Approach 2:
The patent changes the pitch parameter across different winding sections rather than using a uniform integral pitch. By varying the pitch values in different sections, the design achieves superior harmonic reduction capability while maintaining reasonable manufacturing complexity.
3Power
If the generator capacity is increased, then the power output increases, but the volume and dimension of the generator increase accordingly, resulting in increased manufacturing cost and transportation cost
Solution Approach 1:
The stator iron core is divided into multiple segments that can be manufactured separately and assembled, enabling the handling of large-capacity generator components without requiring entirely large-dimension monolithic structures, thus reducing transportation and manufacturing costs.
Solution Approach 2:
Different sections of the stator and winding are optimized for their specific functional requirements, allowing efficient use of materials and space in high-capacity generators without uniformly increasing overall dimensions.
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 configuration effectively reduces generator vibration and noise, extends service life, and improves reliability by minimizing harmonic content and torque ripple while maintaining the overall dimension and cost.
Implementation Method 1
the single-layer winding adopts the integral pitch design, it is unable to effectively reduce the content of fifth and seventh harmonic magnetic fields
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A wind power generator and stator iron core thereof, and stator iron core module; the iron core module (4) has an overall dimension consistent with a principle of the number of slots per pole per phase q = 1; the iron core module (4) is provided with two three-phase winding units therein, an electrical angle formed by the two three-phase winding units is 30 degrees. The method of arranging winding in the stator iron core module (4) is changed to effectively reduce fifth and seventh winding harmonic magnetomotive forces.