Motor Stator Annular Seal With Multi-Plane Coil-End Cooling
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Solution Overview
Problem
Heat distribution in motor coils can become uneven due to factors like mounting position and environment, leading to inadequate cooling of certain parts of the coil end.
Innovation Solution
A motor design featuring a first annular member with strategically positioned holes for refrigerant injection, allowing for adjustable cooling by varying the number, size, and location of holes along the axial direction to match coil density and orientation, ensuring comprehensive and intensive cooling of the coil end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single plane of injection holes is used, then the structure is simple, but the cooling coverage is insufficient due to uneven heat distribution
Solution Approach 1:
The patent transitions from a single-plane (2D) injection hole arrangement to a multi-plane (3D) arrangement. The first injection holes are located on a first plane and the second injection holes are located on a second plane spaced apart from the first plane in the axial direction. This dimensional expansion enables refrigerant to be injected at multiple axial positions, significantly improving cooling coverage throughout the coil end volume and addressing the insufficient cooling problem.
Solution Approach 2:
The injection system is segmented into multiple groups of injection holes distributed across different planes. Each plane contains multiple injection holes that can be independently configured. This segmentation allows the refrigerant injection to be distributed throughout the axial length of the coil end, improving overall cooling coverage without requiring a single complex injection mechanism.
2Temperature
If injection holes are distributed across multiple planes, then cooling coverage is improved, but the device complexity increases
Solution Approach 1:
The annular member is designed to serve multiple functions simultaneously: it provides sealing between the stator core and housing, supports injection holes on multiple planes for refrigerant distribution, and structurally integrates these features into a single component. This multi-functionality reduces the need for separate components for each function, thereby managing device complexity while achieving improved cooling effectiveness.
Solution Approach 2:
The patent combines the sealing function and the multi-plane injection function into a single annular member. The first annular member integrates both the sealing capability and the support structure for injection holes on multiple planes. This merging of functions into one component simplifies the overall device structure compared to having separate sealing elements and injection manifolds.
3Temperature
If the number of injection holes is increased, then cooling coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The injection holes are strategically positioned at different axial locations corresponding to regions of varying heat generation and coil density. The first and second planes are spaced to match the axial distribution of heat in the coil end. This localized positioning optimizes cooling where needed most without requiring uniform high-precision hole distribution throughout the entire structure, thereby managing manufacturing complexity.
Solution Approach 2:
The patent varies parameters such as the axial spacing between planes, the number of holes per plane, and the radial positions of holes to optimize cooling effectiveness. By adjusting these parameters, the system achieves improved cooling uniformity without necessarily increasing the total number of holes, thus managing manufacturing precision requirements.
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 ensures appropriate cooling of the coil end by adjusting refrigerant injection based on coil density and orientation, enhancing cooling efficiency and effectiveness across the entire coil surface.
Implementation Method 1
refrigerant is injected toward a first coil end of the coil protruding from the first end face of the stator core
Implementation Method 2
refrigerant is injected toward a first coil end of the coil protruding from the first end face of the stator core
Data Source
AI summary
A motor may include a rotor; a stator comprising a stator core and a coil; a housing that houses the rotor and the stator; and a first annular member that provides a seal between a first end face of the stator core in an axial direction of the stator core and an inner wall surface of the housing. The first annular member may have a cylindrical shape about an axis of the stator core. The first annular member may include at least one first hole and at least one second hole through which refrigerant is injected toward a first coil end. The at least one first hole may be located on a first plane perpendicular to the axis. The at least one second hole may be located on a second plane that is perpendicular to the axis and spaced apart from the first plane in the axial direction.