Rotor Lamination Overhang Hole for Higher Reluctance Torque
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Solution Overview
Problem
Existing rotor laminations for electrical machines, particularly in automotive applications, do not effectively enhance the performance by increasing reluctance torque, leading to inefficiencies in operation.
Innovation Solution
A rotor lamination design featuring a first hole in the first overhang section to form a flux barrier through magnetic saturation, enhancing reluctance torque and compensating for any reduction in generated torque, thereby improving operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If holes are provided in the pole head section for cooling purposes, then cooling performance is improved, but reluctance torque is reduced
Solution Approach 1:
The patent applies local quality by differentiating the functional characteristics of different regions within the pole head section. The overhang sections are specifically designed with holes for cooling, while the central pole core section maintains solid structure for optimal magnetic flux conduction and torque generation. This regional differentiation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
The pole head section is segmented into functionally distinct zones: the central pole core section and the peripheral overhang sections. This segmentation enables independent optimization of each region - the pole core for magnetic performance and the overhang sections for cooling - thereby resolving the contradiction between cooling requirements and torque generation.
2Power
If holes are formed in the overhang section to form flux barriers, then reluctance torque is increased, but the structural integrity may be compromised
Solution Approach 1:
The invention applies local quality by creating flux barriers specifically in the overhang sections where they are most effective for increasing reluctance torque, while preserving the solid continuous structure in the pole core section. This localized approach to flux barrier formation maximizes the torque enhancement benefit while minimizing the impact on overall structural strength.
Solution Approach 2:
The overhang sections act as intermediary elements that can accommodate holes for dual purposes: forming flux barriers to increase reluctance torque and providing cooling channels. These intermediary structures mediate between the conflicting requirements of torque enhancement and structural integrity by being positioned in a region that is less critical for mechanical strength compared to the pole core.
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 increases reluctance torque, resulting in more efficient operation of electrical machines by forming a flux barrier in the overhang section, thus compensating for torque reduction.
Implementation Method 1
a first hole is formed in the first overhang section... so that a flux barrier can be formed in the first overhang section through magnetic saturation
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Rotor lamination (1) for a rotor lamination stack (50), wherein the rotor lamination (1) has: - a yoke section (2) with a central hole (3) through which a rotational axis (4) of the rotor lamination (1) runs, and - a plurality of pole sections (5), each having a pole core section (6) which projects radially from the yoke section (2), and a pole head section (7) which adjoins the pole core section (6) radially on the outside and forms a first overhang section (8) and a second overhang section (9) which project beyond the pole core section (6) on both sides in the circumferential direction, wherein a first hole (10) is formed in the first overhang section (8).