Electric Motor Iron Core Primary Secondary Teeth Thrust Optimization
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Solution Overview
Problem
Existing electric motors with iron cores and primary and secondary teeth struggle to maximize thrust due to inefficient magnetic flux distribution and magnetic saturation issues, particularly when the ratio of poles to phases is not optimized.
Innovation Solution
The electric motor design features an iron core with primary and secondary teeth, where the windings are configured to cooperate with permanent magnets, with a specific 4m:3n pole-to-phase ratio, and secondary teeth are ¼ or less in width than primary teeth, ensuring balanced magnetic flux and reduced saturation, allowing for enhanced thrust generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of secondary teeth is increased to improve thrust, then magnetic saturation occurs in the iron core, but thrust generation is reduced
Solution Approach 1:
The patent applies local quality by creating two distinct types of teeth with different functions: primary teeth (with windings) that generate magnetic flux, and secondary teeth (without windings) that guide and concentrate the flux. This local differentiation allows the iron core to handle increased tooth count without saturation, as each region is optimized for its specific role in the magnetic circuit.
Solution Approach 2:
The iron core is segmented into primary teeth and secondary teeth, where primary teeth are responsible for generating magnetic flux through windings, and secondary teeth are responsible for guiding and concentrating the flux toward the permanent magnets. This segmentation allows the system to increase the total number of teeth for higher thrust without causing magnetic saturation in any single region.
2Force
If the width of secondary teeth is increased to improve thrust, then magnetic flux distribution becomes unbalanced, but thrust efficiency is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the width ratio between primary and secondary teeth to be 2:1 or greater. This specific parameter relationship ensures that secondary teeth are narrow enough to maintain balanced magnetic flux distribution while being wide enough to effectively guide and concentrate flux, thereby improving thrust efficiency without compromising flux balance.
3Force
If the ratio of poles to phases is not optimized, then thrust generation is improved, but core loss increases
Solution Approach 1:
The patent applies the composite materials principle by creating a composite magnetic circuit structure that combines primary teeth with windings and secondary teeth without windings. This composite configuration, combined with the optimized 4m:3n pole-to-phase ratio, enables effective thrust generation while reducing core loss through improved magnetic flux distribution and reduced eddy current effects.
4Force
If more windings are added to increase thrust, then device complexity increases, but thrust generation is improved
Solution Approach 1:
The patent applies universality by designing secondary teeth that perform multiple functions: they guide magnetic flux from primary teeth, concentrate flux toward permanent magnets, and contribute to thrust generation without requiring windings. This multi-functionality reduces the need for additional windings on every tooth, thereby reducing device complexity while maintaining or improving thrust generation.
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 results in increased thrust efficiency, reduced core loss, and improved heat dissipation, enabling the electric motor to generate maximum thrust while maintaining structural integrity and efficiency across various phases.
Implementation Method 1
the plurality of windings of the first electric motor element are configured such that, when three-phase alternating current is supplied, they cooperate with the plurality of permanent magnets of the second electric motor element to generate thrusts of the electric motor
Implementation Method 2
a plurality of permanent magnets forming a plurality of poles and that is oppositely situated against the first electric motor element
Data Source
AI summary
An electric motor includes a rotor including an iron core and a plurality of windings, and a stator including a plurality of permanent magnets forming a plurality of poles. The iron core has a plurality of primary teeth around each of which a winding is wound and a plurality of secondary teeth around each of which no winding is wound. The primary teeth and the secondary teeth are formed alternately with each other. The electric motor is configured such that a ratio between the number of poles formed by the permanent magnets of the stator and the number of phases formed by the windings of the rotor is 4m:3n (m and n are any natural numbers, excluding the case where m:n=2:3 is satisfied).