Stator Crush Resistance Device for Electric Motors
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Solution Overview
Problem
Traditional fixing methods for stators in electric motors, such as snap rings, face challenges due to the presence of electrically conductive windings and connections, which hinder secure positioning within the motor housing.
Innovation Solution
A stator positioning device comprising an annular contact ring, a cover ring, and shim rings or springs that form a coaxial assembly with pegs to inhibit axial and rotational movement, ensuring secure positioning of the stator within the motor cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional snap rings are used to fix the stator, then the stator can be secured to the housing, but the presence of electrically conductive windings and connections prevents the snap ring from properly abutting the stator core
Solution Approach 1:
The stator positioning device is divided into multiple segmented components: a contact ring with multiple contact members, a cover ring with multiple cover members, and multiple shim members. These segmented elements can be assembled around the stator core and windings without requiring a single large snap ring to fit over all conductive components, thereby solving the problem of securing the stator while accommodating the windings and connections.
Solution Approach 2:
The contact ring and cover ring act as intermediary elements between the housing and the stator core. The contact ring makes direct contact with the stator core to prevent axial movement, while the cover ring secures the contact ring in place. These intermediaries allow the stator to be fixed without requiring traditional snap rings to fit over the conductive windings and connections.
2Stability of the object's composition
If the stator is secured using conventional means, then axial positioning is achieved, but rotational movement and structural stability are insufficient
Solution Approach 1:
The device merges multiple positioning functions into a single integrated assembly. The contact ring prevents axial movement, the cover ring prevents radial movement and secures the contact ring, and the shim members prevent rotational movement. By combining these functions into one cohesive device, the patent achieves comprehensive stator stabilization without requiring multiple separate components, thereby managing device complexity while enhancing stability.
Solution Approach 2:
The shim members are designed to be compressible between the contact ring and cover ring, allowing the assembly to adapt to manufacturing tolerances and thermal expansion. This dynamic characteristic enables the positioning device to maintain stable contact with the stator core under varying operating conditions, enhancing positional stability while keeping the device structure relatively simple.
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 solution effectively prevents axial movement and rotation of the stator, providing a secure and stable assembly that accommodates the stator's conductive windings and connections, enhancing the motor's structural integrity and operational reliability.
Implementation Method 1
at least one spring configured to bias the contact ring axially toward the stator core
Data Source
AI summary
An electric motor can include a stator positioning device. First and second housing bodies can define a motor cavity. The stator can be disposed about the rotor within the motor cavity. The stator positioning device can include a plurality of contact members, and a plurality of cover members. The contact members can cooperate to form an annular contact ring that is coaxial with an output axis and has a first side and a second side. The first side can be in contact with a first end of the stator core. The cover members can cooperate to form an annular cover ring that is coaxial with the axis and coupled to the second side of the contact ring. The cover ring can include a flange that extends radially outward of the contact ring and is axially between the first and second housing bodies to inhibit axial movement of the cover ring.