Coil Retainer Spine and Rib for Rotor Winding Stability
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Solution Overview
Problem
Existing wound rotors in electric machines face challenges in maintaining the stability and position of windings at high speeds due to centrifugal forces, leading to potential movement and shifting of wires between teeth and windings.
Innovation Solution
A coil retainer with a flat body, longitudinal spine, and central rib is used to prevent movement of windings by providing structural support and reaction forces, formed from nonmagnetic materials to avoid magnetic interference and made from heat-resistant polymers for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If windings are placed in rotor teeth for high-speed operation, then electrical energy conversion capability is improved, but centrifugal forces cause winding movement and instability
Solution Approach 1:
The coil retainer is divided into multiple functional segments: a flat body portion that contacts the rotor tooth, a longitudinal spine that provides structural support, and a central rib that prevents radial movement. This segmentation allows each portion to address specific stability issues caused by centrifugal forces while maintaining overall winding stability at high speeds
Solution Approach 2:
The coil retainer is pre-installed in the rotor tooth before the windings are placed. This preliminary positioning creates a predetermined structural framework that guides and constrains the windings during installation and operation, preventing movement before centrifugal forces can cause instability
2Stability of the object's composition
If structural support is added to prevent winding movement, then winding stability is improved, but device complexity increases
Solution Approach 1:
Multiple support functions are merged into a single integrated coil retainer component. The flat body, longitudinal spine, and central rib are combined into one piece that simultaneously provides axial support, radial constraint, and structural framework, eliminating the need for multiple separate support elements and reducing overall device complexity
Solution Approach 2:
The coil retainer performs multiple functions within a single component: it provides a mounting framework for windings, resists axial forces through the flat body, prevents radial movement through the central rib, and maintains structural integrity through the longitudinal spine. This multi-functionality reduces the number of components needed while achieving comprehensive winding stability
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 coil retainer effectively prevents radial and axial movement of windings at high speeds, ensuring stability and maintaining magnetic integrity, as demonstrated by the rotor's operation at speeds exceeding 7000 RPM without winding displacement.
Implementation Method 1
formed from nonmagnetic materials to avoid magnetic interference
Implementation Method 2
maintaining the stability and position of windings at high speeds due to centrifugal forces
Data Source
AI summary
A coil retainer for a rotor includes a flat body and a longitudinal spine. The flat body has a first thickness and the longitudinal spine has a second thickness greater than the first thickness. The coil retainer may also include a central rib, which has a third thickness. The central rib runs laterally relative to the flat body and the third thickness of the central rib is greater than the first thickness.