Rotating Electric Machine RMI Compensation
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Solution Overview
Problem
Existing rotating electric machines face challenges in compensating for magnetic armature reaction (RMI) issues, which affect efficiency and performance, especially in automotive applications where defluxing problems are common and existing solutions are complex or difficult to implement.
Innovation Solution
A rotating electric machine design featuring a rotor with a plurality of excitation coils and first permanent magnets with tangential magnetization in recesses to compensate for RMI, optimized in terms of position and dimensions to minimize parasitic effects, along with second permanent magnets contributing to pole formation, allowing for effective RMI compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex rotor structures with multiple components are used to compensate for magnetic armature reaction, then compensation effectiveness improves, but device complexity increases
Solution Approach 1:
The invention combines the RMI compensation function with the pole formation function into a single integrated rotor structure. The first permanent magnets are positioned in the polar sections to compensate for magnetic armature reaction, while the second permanent magnets in the inter-polar sections contribute to pole formation. This merging of functions eliminates the need for separate compensation components, thereby reducing device complexity while maintaining compensation effectiveness.
Solution Approach 2:
The rotor structure achieves multi-functionality by using permanent magnets that simultaneously perform RMI compensation and pole formation. The first permanent magnets compensate for magnetic armature reaction in the polar sections, while the second permanent magnets in the inter-polar sections enhance pole formation. This universal design allows a single rotor structure to address multiple performance requirements without adding extra components.
2Reliability
If permanent magnets are added to compensate for magnetic armature reaction, then compensation effectiveness improves, but manufacturing complexity increases
Solution Approach 1:
The rotor is segmented into distinct functional zones: polar sections containing first permanent magnets for RMI compensation, and inter-polar sections containing second permanent magnets for pole formation. This segmentation allows for standardized manufacturing of magnet assemblies that can be pre-positioned and integrated into the rotor structure, simplifying the overall manufacturing process despite the added functionality.
Solution Approach 2:
Different regions of the rotor are assigned different qualities and functions: the polar sections have first permanent magnets optimized for RMI compensation, while the inter-polar sections have second permanent magnets optimized for pole formation. This local differentiation allows each region to be manufactured with specific requirements in mind, improving ease of manufacture while achieving effective RMI compensation.
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 solution significantly reduces harmonic distortion and improves efficiency by optimizing the placement and dimensions of permanent magnets, enhancing torque and reducing iron losses, while maintaining simplicity and compatibility with existing machine structures.
Implementation Method 1
a plurality of first permanent magnets (7) having a substantially tangential direction of magnetization arranged in second recesses (8) extending substantially in radial planes of symmetry (6) of the polar sections so as to compensate for the RMI
Implementation Method 2
These poles are formed from a plurality of excitation coils housed in a plurality of first recesses, which are distributed regularly around a shaft of the rotor
Implementation Method 3
a plurality of second permanent magnets arranged in third recesses distributed regularly around the rotor shaft in the circumferential part, between the polar sections, and extending axially into the magnetic mass of the rotor so as to contribute to the formation of the North poles and South poles
Data Source
Figure 1
Figure 2a~2b
AI summary
The machine according to the invention is of the type of those comprising a rotor (2) having alternating north and south poles and excitation coils (3) housed in first recesses (4) which are distributed regularly around a shaft (5) of the rotor. These first recesses are arranged radially in the rotor between a central part and a circumferential part of the rotor and extend axially, in such a way as to define polar sections (6). Each excitation coil is inserted around a core forming a partition between two first consecutive recesses, the core being substantially aligned with a central radial axis (d) of the corresponding polar section. In accordance with the invention, the rotor furthermore comprises a plurality of permanent magnets (7) exhibiting a substantially tangential direction of magnetization, which are arranged in second recesses (8) and extend substantially in radial symmetry planes of the polar sections (6), in such a way as to compensate the armature magnetic feedback.