Stator Cluster Assembly With Localized Resin Insulation
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Solution Overview
Problem
High voltage requirements in refrigerant compressors for motor vehicle air conditioning systems pose challenges in insulation coordination, particularly at contact points and transition connections, which are exposed to conductive oil-refrigerant mixtures, necessitating effective electrical insulation while avoiding leakage currents and maintaining mechanical integrity.
Innovation Solution
A cluster assembly with an annular support part and side closure ring segments is used for coil connection, contacting, and insulation, forming vessels for insulating filling material like epoxy resin, ensuring robust insulation and leakage current protection without excessive material usage or complex processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid casting compound is used for insulation, then electrical insulation is achieved, but process complexity and manufacturing steps increase
Solution Approach 1:
The insulating cover is pre-assembled onto the cluster before the casting process, creating a pre-configured insulation structure that guides the casting compound and eliminates the need for complex post-assembly insulation measures
Solution Approach 2:
The insulating cover acts as an intermediary component between the conductive elements and the casting compound, providing a structured interface that simplifies the casting process and ensures proper insulation without requiring complex tooling or additional components
2Reliability
If insulating filling material is used to cover contact points, then leakage current protection is achieved, but material usage and cost increase
Solution Approach 1:
The insulating cover creates localized cavities that concentrate the casting compound exactly where insulation is needed around contact points, rather than requiring uniform coverage across the entire cluster, thus reducing overall material usage while maintaining protection effectiveness
Solution Approach 2:
The cluster is divided into distinct sections with the insulating cover creating separate cavities for each contact point, allowing precise application of casting compound only where required and eliminating waste in non-critical areas
3Reliability
If complex protective covering is designed to meet insulation requirements, then insulation efficiency is improved, but assembly difficulty and time increase
Solution Approach 1:
The insulating cover integrates multiple functions into a single component: it provides structural support, creates insulation cavities, guides the casting compound, and secures to the cluster, eliminating the need for multiple separate protective components and simplifying assembly
Solution Approach 2:
The insulating cover serves multiple purposes simultaneously: mechanical support, electrical insulation guidance, casting compound containment, and structural integration with the cluster, reducing the total number of components and assembly steps while maintaining high insulation efficiency
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 provides efficient and cost-effective electrical insulation for high voltage applications, reducing material usage and process complexity, while ensuring robust insulation and leakage current protection across all operating conditions.
Implementation Method 1
the requirements regarding the insulation coordination of stators in electrically operated refrigerant compressors are extremely high... contact points or transition connections must be electrically insulated accordingly, since the oil-refrigerant mixture flowing through the electrical refrigerant compressor is electrically conductive
Data Source
AI summary
A cluster assembly for coil connection, contacting and insulation of a stator unit of an electric motor for driving a refrigerant compressor including an annular cluster and at least one side closure ring segment securing the connection of three wire ends to first connecting elements or three wire ends to second connecting elements and their insulation by means of a mounting connection on the outer circumference of the annular cluster. Further, a stator unit includes a corresponding cluster assembly, and a method for producing a stator insulation system for the stator unit. Vessels are formed by mounting the side closure ring segments on the cluster, each of which surrounds a contact point and which are filled with a casting compound of an insulating filling material.