Stator Coil End Layout for Compact Aircraft Motor Axial Width
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Solution Overview
Problem
Conventional motors require increased size due to the axial width expansion caused by drawing out conductive wire ends in an axial direction, which complicates the design and functionality, especially in applications like aircraft propulsion where space is limited.
Innovation Solution
The motor design incorporates a stator with a stator core featuring an annular core back and radially extending teeth, where the coil conductor is wound around the teeth with ends positioned within a specific axial range, thereby minimizing the axial width and allowing for a more compact motor structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end of the conductive wire is drawn out in the axial direction, then the coil can be formed, but the axial width of the coil increases and the motor size must be increased
Solution Approach 1:
The patent applies dimensionality change by redirecting the conductive wire end from the axial direction to the radial direction. Specifically, the wire end is drawn out in the radial direction parallel to the radial line passing through the center of the stator core, allowing the wire to exit the coil structure without increasing axial width. This dimensional redirection resolves the contradiction between ease of manufacture and compact axial dimensions.
Solution Approach 2:
The patent inverts the conventional approach by having the wire end extend radially outward from the coil rather than axially. This inversion of the wire exit direction allows the coil to maintain a compact axial profile while still providing accessible wire ends for electrical connections, effectively resolving the size constraint without compromising manufacturability.
2Volume of moving object
If the motor size is reduced, then space efficiency improves, but the coil structure becomes more constrained
Solution Approach 1:
By changing the wire exit direction from axial to radial, the patent enables compact motor design without complicating the coil structure. The radial wire arrangement naturally integrates with the stator core geometry, and the wire can be routed through the tooth structure to achieve external connections without requiring additional complex components or routing paths.
Solution Approach 2:
The stator tooth structure serves multiple functions: it provides magnetic flux paths, structural support, and wire routing channels. The wire end drawn out radially utilizes the existing tooth structure as a natural conduit, eliminating the need for separate wire management components and maintaining structural simplicity while achieving compact dimensions.
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 enables the motor to be downsized without compromising performance, as the axial position of the coil ends is optimized to reduce the motor's axial width, facilitating more efficient use in applications such as aircraft propulsion.
Implementation Method 1
a coil on at least a portion of the stator core. The coil includes a conductor including an annular wound portion wound around the teeth
Data Source
AI summary
A motor includes a rotor and a stator including a stator core including a core back and teeth, and a coil including a conductor including a wound portion wound around the teeth and an end extending from the wound portion. An axial position of the end is within a range from an end on one side to an end on the other side in an axial direction of the wound portion.