Rectifier Housing with Axial Cooling Perforations
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Solution Overview
Problem
Current current rectifying devices in rotating electrical machines, such as alternators, face challenges with inadequate cooling and increased power demands due to rising ambient temperatures under engine covers, leading to inefficient operation and potential overheating.
Innovation Solution
A current rectifier device with a housing made of electrically insulating and moldable material, featuring axial perforations for cooling fluid flow and transverse housings to accommodate multiple current rectifier modules, allowing for improved cooling and reduced axial size, enabling operation at higher temperatures and increased power capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional current rectifying devices are used in rotating electrical machines, then the device structure is simple, but the cooling effectiveness is insufficient leading to overheating at high temperatures
Solution Approach 1:
The housing is divided into multiple transverse housings, each accommodating current rectifier modules. This segmentation allows independent cooling channels for each module, improving cooling effectiveness while maintaining structural organization
Solution Approach 2:
The housing includes axial perforations that create three-dimensional cooling pathways through the structure. Cooling fluid can flow axially through the housing and transverse housings, providing cooling from multiple directions rather than a single plane
2Temperature
If ambient temperature under engine cover increases, then the alternator can operate in higher temperature environments, but the current rectifying elements overheat and efficiency decreases
Solution Approach 1:
Cooling fluid acts as an intermediary substance that absorbs heat from current rectifier modules and transports it away. The housing and transverse housings serve as intermediaries to channel this cooling fluid through the rectifying elements, maintaining efficiency at high ambient temperatures
3Reliability
If the housing is designed with axial perforations and transverse housings for improved cooling, then the cooling effectiveness increases, but the device complexity increases
Solution Approach 1:
The housing serves multiple functions simultaneously: it provides structural support, electrical insulation, and integrated cooling channels. The transverse housings both accommodate rectifier modules and serve as cooling passages, reducing the need for separate cooling components
4Power
If multiple current rectifier modules are accommodated in transverse housings, then the power capacity increases, but the assembly complexity increases
Solution Approach 1:
The housing is segmented into multiple transverse housings, each designed to accommodate current rectifier modules. This modular segmentation allows modules to be pre-assembled and tested independently, then installed as complete units, reducing overall assembly complexity despite increased power capacity
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 effective cooling for current rectifying elements, enabling the devices to operate efficiently at higher temperatures and handle increased power demands, while also simplifying assembly and standardizing the rectification arrangement.
Implementation Method 1
the housing (26, 27) is axially perforated... providing effective cooling for current rectifying elements
Implementation Method 2
enabling the devices to operate efficiently at higher temperatures
Data Source
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AI summary
The invention relates to a current rectifying device (25) for a polyphase rotating electrical machine, said device comprising at least two current rectifying modules (100), each of a different phase of the machine, and an axially open housing (26, 27) consisting of a mouldable, electrically insulating material provided with a plurality of transversal recesses (600), at least two of said recesses (600) being used to receive a current rectifying device (100) and being defined by walls (30) pertaining to a lower part (27) of the housing. The polyphase rotating electrical machine is characterised in that it comprises such a device. The invention can be applied to an alternator or an alternator starter of a motor vehicle.