Integrated Insulating Force Transmission Element for Wet Rotor Motors
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Solution Overview
Problem
Conventional bushing arrangements for wet rotor motors require multiple insulating bodies and long overlap areas for creepage distances, leading to increased installation space and additional sealing points, which can be heated by eddy currents.
Innovation Solution
A single insulating body with a fully integrated force transmission element made of high-strength fiber material, which provides mechanical reinforcement and separates insulation and power transmission tasks, reducing installation space and sealing points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two insulating bodies are used with long overlap for creepage distances, then insulation reliability is improved, but installation space increases
Solution Approach 1:
The patent combines the force transmission element and the insulating body into a single integrated component. The force transmission element is completely integrated into the insulating body, eliminating the need for separate insulating bodies and long overlap areas, thus reducing installation space while maintaining insulation reliability
Solution Approach 2:
The force transmission element consists of high-strength fiber material embedded in a matrix to form a mechanical reinforcement. This composite structure provides both the necessary mechanical strength for force transmission and the electrical insulation properties, allowing a single component to fulfill both functions
2Strength
If metal rings are used for protection against high loads, then mechanical strength is improved, but eddy current heating occurs
Solution Approach 1:
The patent converts the previously harmful metal rings into a beneficial non-conductive force transmission element made of high-strength fiber material. This material provides the necessary mechanical strength for protecting against high loads while being electrically non-conductive, thus eliminating eddy current heating while maintaining mechanical protection
Solution Approach 2:
The patent changes the material parameter from conductive metal to non-conductive high-strength fiber material. This parameter change maintains the mechanical strength function while eliminating the harmful electrical conductivity that caused eddy current heating
3Reliability
If multiple sealing points are used, then pressure tightness is improved, but the number of sealing points increases leading to more heat generation
Solution Approach 1:
The integration of the force transmission element into the insulating body reduces the number of separate components and their associated sealing interfaces. This merging reduces the total number of sealing points while maintaining pressure tightness, thereby reducing heat generation from eddy currents at sealing locations
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 design minimizes installation space, reduces sealing surfaces, and prevents eddy current heating, ensuring a compact and safe high-pressure wet rotor motor system.
Implementation Method 1
at least one force transmission element arranged between the retaining element and the housing, upon which the retaining element, which is fixed to the housing by fastening elements, exerts a force that the force transmission element transmits to the housing and/or the insulating body
Implementation Method 2
the force transmission element is a mechanical reinforcing element made of an electrically non-conductive and/or non-magnetic material. This avoids eddy current losses and the associated heating.
Data Source
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AI summary
The invention relates to a device comprising a pump (4) driven by a wet-running motor (1). The device further comprises a housing (2) that includes a bushing arrangement (12) for energizing the wet-running motor (1). The bushing arrangement (12) comprises a cable element (14) and an insulating member (15). The bushing arrangement (12) also comprises a force transmission element (20).