Media Gap Motor Holding Ribs for Bearing-Free Shaft Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell systems face challenges in achieving high efficiency, compactness, durability, and ease of manufacturing, particularly in the design of media gap motors used for radial and axial bearing tasks.
Innovation Solution
The proposed media gap motor incorporates holding ribs in the flow space to provide robust radial support for the shaft, eliminating the need for additional radial bearings and optimizing magnetic flux, while using a turbine wheel to enhance efficiency by driving the impeller with the energy from the medium flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air bearings are used for radial and axial bearing tasks in the cathode circuit, then the fuel cell system can operate, but the structure becomes complex and the efficiency is reduced
Solution Approach 1:
The patent combines the bearing function with the housing structure by integrating holding ribs directly into the housing. These holding ribs provide both radial support for the shaft and structural strength, eliminating the need for separate air bearing components while maintaining the necessary bearing function for reliable operation.
Solution Approach 2:
The holding ribs in the housing serve multiple functions simultaneously: they provide radial bearing support for the shaft, maintain structural integrity of the housing, and define the flow channel geometry. This multi-functionality reduces overall device complexity while ensuring reliable operation.
2Reliability
If additional radial bearings are provided outside the flow space, then the shaft support is improved, but the device size increases and manufacturing becomes more difficult
Solution Approach 1:
The radial bearing function is merged with the housing structure through the holding ribs. The holding ribs are formed as integral parts of the housing, combining shaft support functionality with the existing housing geometry, which simplifies manufacturing compared to adding separate bearing components.
Solution Approach 2:
The housing structure itself provides the radial bearing support through its holding ribs, eliminating the need for additional external bearing components. The housing serves its own bearing function, reducing manufacturing complexity and improving ease of assembly.
3Device complexity
If the holding ribs are located completely in the flow space, then the media gap motor is compact and durable, but the magnetic flux optimization is challenged
Solution Approach 1:
The holding ribs are strategically positioned in specific regions of the flow space where they provide necessary structural support without interfering with the primary magnetic flux paths. The local placement optimizes both structural durability and magnetic efficiency by avoiding high-flux regions while maintaining shaft support.
Solution Approach 2:
The holding ribs act as intermediaries that transmit mechanical loads from the shaft to the housing while maintaining adequate clearance for magnetic flux circulation. Their positioning and geometry are optimized to mediate between structural support requirements and magnetic field distribution.
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 design achieves a compact, durable, and efficient media gap motor that enhances fuel cell system performance by increasing medium pressure and optimizing flow properties, leading to improved efficiency and reduced hydrogen consumption.
Implementation Method 1
a stator with stator windings for electrically driving a rotation of the shaft. The stator windings and the rotor magnet may work together for this purpose
Implementation Method 2
Some embodiments of the media gap motor have a turbine wheel. The turbine wheel may be disposed on the shaft
Data Source
AI summary
The present application relates to a media gap motor (10) and also a fuel cell system (1) comprising a media gap motor (10). The application additionally relates to a use of the media gap motor (10) and of the fuel cell system (1). The proposed media gap motor (10), for example for a fuel cell system (1), has a shaft (15), in which there is accommodated a rotor magnet (22). The media gap motor (10) additionally has a stator with stator windings (23) for electrically driving a rotation of the shaft (15). The media gap motor (10) furthermore has a housing (26), which delimits a flow space (11) formed between the shaft (15) and the stator. The media gap motor (10) further has an impeller (13) disposed in the flow space (11) and on the shaft.