Two-Tooth Radial Flux Motor Layout for Low Magnetic Leakage
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Solution Overview
Problem
Existing radial flux motors face challenges with large magnetic leakage fluxes and complex, costly windings, particularly in compact designs with limited installation space, and require a design that minimizes leakage fluxes while ensuring efficient operation and maximizing flow space.
Innovation Solution
A radial flux motor design featuring a stator with two stator teeth and windings arranged along the annular circumferential surface, using Soft Magnetic Composite (SMC) material, with windings extending radially and axially, and connected in series or parallel to minimize stray fields and maximize flow cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large air gap is used to reduce turbulence and maximize flow space, then flow cross-section is improved, but magnetic leakage flux increases
Solution Approach 1:
The stator is segmented into exactly two stator teeth instead of multiple teeth, creating a simplified magnetic circuit structure. This segmentation approach allows the air gap to be optimized for flow while the two-teeth configuration maintains magnetic efficiency by reducing leakage paths compared to multi-tooth designs.
Solution Approach 2:
The windings are arranged to extend around the annular circumferential surface in a three-dimensional configuration, with windings positioned both inside and outside the stator. This spatial arrangement creates magnetic flux paths that efficiently utilize the available space while minimizing leakage, allowing a large air gap without sacrificing magnetic performance.
2Object-generated harmful factors
If a complex distributed winding is used to reduce magnetic leakage flux, then magnetic efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The winding system is segmented into two independent windings, each assigned to one of the two stator teeth. This simplification eliminates the need for complex distributed windings across multiple teeth, reducing manufacturing complexity while maintaining magnetic efficiency through the focused two-tooth configuration.
Solution Approach 2:
Instead of arranging windings in the traditional manner around individual teeth, the windings extend around the annular circumferential surface of the stator in an inverted configuration. This unconventional arrangement simplifies the winding structure while effectively reducing magnetic leakage flux through the optimized flux paths.
3Object-generated harmful factors
If multiple stator teeth are used to improve magnetic performance, then magnetic flux distribution is improved, but flow space and cross-sectional area decrease
Solution Approach 1:
The stator is segmented into exactly two stator teeth, which is the optimal number that balances magnetic performance with flow space requirements. This segmentation provides sufficient magnetic flux distribution while maximizing the available cross-sectional area for fluid flow, unlike multi-tooth configurations that would obstruct flow paths.
Solution Approach 2:
The two stator teeth are positioned asymmetrically at 180 degrees apart on the annular circumferential surface, creating an optimized magnetic circuit that efficiently distributes flux while minimizing obstruction to flow. This asymmetric two-tooth configuration outperforms symmetric multi-tooth arrangements in terms of flow-cross-section availability.
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 achieves low stray fields, allowing a large air gap and compact rotor diameter, ensuring efficient operation with a simple winding configuration and maximizing flow space, even with single-phase current.
Implementation Method 1
The first winding and the second winding are arranged and connected to one another in such a way that a magnetic flux 30, which can be generated by the respective winding during operation of the electric motor 1
Implementation Method 2
a magnetic flux 30, which can be generated by the respective winding during operation of the electric motor 1, is guided in the region of the stator slots 12, 13 through the circumferential surface 10 (the base body of the stator 4) along opposite circumferential directions 27 and is summed in the region of the stator teeth 8, 9 and is conductable along the radial direction 11 via the stator teeth 8, 9 and the rotor 2
Implementation Method 3
The SMC material is not sintered. Instead, it is tempered to below a melting temperature, which is sufficient to ensure that the stator permanently retains its geometry.
Data Source
Figure 1~3
Figure 4~5
AI summary
An electric motor (1), at least having: a rotor (2) with an axis of rotation (3) and an annular stator (4) surrounding the rotor (2), the stator extending along an axial direction (5) parallel to the axis of rotation (3) and having a first end face (6) and a second end face (7) pointing in opposite axial directions (5); wherein the stator (4) has exactly two stator teeth (8, 9) extending from an annular circumferential surface (10) that runs between the end faces (6, 7) of the stator (4), in a radially inward direction (11) to the rotor (2) and facing one another in relation to the axis of rotation (3), a first stator slot (12) and a second stator slot (13), which faces the first slot in relation to the axis of rotation (3), extending along the circumferential surface (10), between the stator teeth (8, 9).