Variable-Force Rotor Structure for Centrifugal Load Strength
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Solution Overview
Problem
Existing variable magnetic-force motors for automobiles face challenges in optimizing the rotor structure for various operation scenes and ensuring strength against centrifugal forces, leading to complex layouts and potential structural weaknesses.
Innovation Solution
A rotor structure with a flange part, base part, and connecting parts, including fixed and variable magnetic-force magnets, and strategically placed cavities and pillar parts to distribute load and enhance strength, while allowing magnetic force adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable magnetic-force magnets are used to adapt to various operation scenes, then output and efficiency are improved, but the rotor structure becomes complicated and strength against centrifugal forces decreases
Solution Approach 1:
The rotor structure is segmented into functionally distinct regions: a flange part containing magnetic pole parts with variable magnetic-force magnets for adaptability, and a base part providing structural support. This segmentation allows each region to specialize in its function while reducing overall structural complexity.
Solution Approach 2:
The patent introduces a radial dimension to the rotor structure by positioning magnetic pole parts in the flange part (outer radius) and the base part (inner radius), creating a radial gradient of functionality. This dimensional arrangement allows complex magnetic control functions to be concentrated in specific regions without compromising overall structural integrity.
2Productivity
If variable magnetic-force magnets are used to adapt to various operation scenes, then efficiency is improved, but the rotor structure becomes complicated and strength against centrifugal forces decreases
Solution Approach 1:
The rotor is divided into a flange part for magnetic functionality and a base part for structural strength. This segmentation ensures that the base part, which experiences high centrifugal forces, maintains simple and robust construction, while the flange part handles the complex magnetic variable-force requirements.
Solution Approach 2:
Different regions of the rotor are assigned different properties: the flange part contains variable magnetic-force magnets for efficiency and adaptability, while the base part is designed with simplified structure for maximum strength. This local differentiation allows each region to optimize for its specific function without compromising the other.
3Strength
If the rotor structure is simplified to improve strength, then centrifugal force resistance is improved, but adaptability to various operation scenes decreases
Solution Approach 1:
The rotor structure separates adaptability functions (variable magnetic-force magnets in flange part) from structural functions (base part). This allows the base part to be simplified for strength while the flange part maintains complexity for adaptability, resolving the contradiction between simplification and versatility.
Solution Approach 2:
The rotor employs dynamic magnetic control through variable magnetic-force magnets that can change their magnetic force characteristics during operation. This dynamic capability is localized in the flange part, allowing the overall structure to remain simple and strong while maintaining high adaptability through active magnetic control.
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 rotor structure effectively adapts to various operation scenes, enhances strength, and optimizes power factor over a wide range, improving motor performance and fuel efficiency.
Implementation Method 1
a plurality of magnetic pole parts disposed in the rotor core so that N-poles and S-poles are lined up alternately in a circumferential direction of the rotor core along an opposing surface
Implementation Method 2
A permanent magnet synchronous motor is used widely for this kind of drive motor
Implementation Method 3
a drive motor which is able to change the magnetic force of the rotor by using a permanent magnet with a small coercive force (hereinafter, referred to as a 'variable magnetic-force motor')
Implementation Method 4
these rotor elements are unevenly distributed in the outer circumferential part of the rotor on which a strong centrifugal force acts when the rotor rotates
Data Source
AI summary
A rotor having a changeable magnetic force is provided, which includes a rotor core and magnetic pole parts disposed therein. The rotor core includes a flange part opposing a stator, a base part located inward of the flange part, and a connecting part coupling the base part to the flange part. Each magnetic pole part includes a fixed magnetic-force magnet and a variable magnetic-force magnet disposed in the flange part, and a cavity part defined by the connecting part, between the flange part and the base part. By bisecting each fixed magnetic-force magnet in line symmetry into a pair of magnet pieces, an inside coupling part is provided in the flange part. A first pillar part is comprised of outside coupling parts that bridge the flange part and the base part, and are disposed circumferentially inward of the center position of the circumferential width of each magnet piece.