WFSM Rotor Coil V-Layout for Higher Air-Gap Flux Density
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Solution Overview
Problem
Existing motors, particularly wound field synchronous motors (WFSMs), face challenges in generating high power due to structural limitations and increased magnetic air gap length, which weakens the magnetic flux transmitted to the air gap.
Innovation Solution
A motor design featuring a rotor with rotor coils arranged in a circumferential direction, paired in twos to implement N-poles or S-poles, and arranged in a 'V' shape to concentrate magnetic flux inwardly, enhancing torque generation without significant structural modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If rotor coils are arranged in a conventional configuration, then the motor structure remains simple, but the magnetic flux density in the air gap is insufficient
Solution Approach 1:
The rotor coils are arranged in an asymmetric 'V' shape configuration rather than a symmetric circular pattern. This asymmetric arrangement concentrates magnetic flux lines toward the center of the air gap, increasing magnetic flux density without requiring additional coils or complex structural modifications.
Solution Approach 2:
The rotor coils are positioned at different radial distances from the center, creating a multi-dimensional spatial arrangement. By placing coils at varying radii and angles, the magnetic flux is concentrated in specific regions of the air gap, enhancing flux density through spatial optimization rather than simply adding more coils.
2Volume of moving object
If the magnetic air gap length is increased, then the motor can accommodate larger components, but the magnetic flux transmitted to the air gap is weakened
Solution Approach 1:
Instead of uniformly increasing the air gap length throughout, the invention creates local variations in air gap dimensions. The 'V' shaped coil arrangement produces regions of concentrated magnetic flux where the effective air gap is minimized, ensuring strong flux transmission in critical areas while allowing larger overall motor dimensions.
Solution Approach 2:
The motor employs a composite magnetic circuit design combining different magnetic path lengths and materials. By strategically positioning rotor coils and designing the magnetic circuit with varying path characteristics, the system maintains efficient flux transmission even with increased overall motor volume.
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 proposed motor design increases the maximum air gap magnetic flux density and torque output by approximately 3.3% compared to traditional motors, while maintaining a simple structural change, thus addressing the limitations of existing high-power motor designs.
Implementation Method 1
a plurality of rotor coils interacting with the plurality of stator coils to generate rotational force
Implementation Method 2
arranged in a 'V' shape so that ends thereof adjacent to a stator coil of the stator are opened to implement an N-pole or S-pole... magnetic flux coming from the plurality of rotor coils paired in twos and arranged in the 'V' shape may be concentrated inwardly
Data Source
AI summary
A motor includes a stator including a plurality of stator coils repeatedly arranged in a circumferential direction. The motor also includes a rotor provided inside the stator to be rotatable about a rotating shaft. The rotor includes a plurality of rotor coils interacting with the plurality of stator coils to generate rotational force. The plurality of the rotor coils are repeatedly arranged in the circumferential direction and are paired in twos to implement an N-pole or an S-pole.