Single-Piece Rotating Rectifier Housing for Dielectric Clearance
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Solution Overview
Problem
Traditional rotating rectifiers have limitations such as mechanical imbalance, insufficient dielectric clearance, and design constraints that prevent them from being applied in variable frequency generator applications where AC and DC connections are in the same area, and they are prone to loose connections at higher speeds due to split housing designs.
Innovation Solution
A single-piece diode pack housing with five or less bus bar channels spaced 72 degrees apart, allowing for a 3-phase AC input and 2-phase DC output, with a diode pack and bus bars that provide improved dielectric clearance and allow coolant flow from either side, enabling more versatile and stable operation at higher speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-piece housing design is used to accommodate DC bus bars, then the housing can be assembled, but the DC connections can come loose at higher speeds (24,000 RPM and above)
Solution Approach 1:
The patent merges the two-piece housing design into a single-piece housing structure. This eliminates the interface between housing pieces that could allow DC connections to come loose at high speeds, while still enabling assembly through integrated features like the diode pack housing that receives and secures all DC connections in a unified structure.
2Stability of the object's composition
If bus bars are spaced 60° apart with only three connections utilized, then the rotating rectifier can be mechanically balanced, but the fourth connection point is underutilized and dielectric clearance is insufficient (0.099″ vs. required 0.125″)
Solution Approach 1:
The patent changes the angular spacing parameter from 60° to 72° between adjacent bus bar channels. This reconfiguration allows for five bus bar channels spaced evenly around the circumference, providing adequate dielectric clearance of at least 0.125″ between channels while maintaining mechanical balance through symmetric distribution of connections.
3Ease of manufacture
If the housing is designed as two separate pieces, then assembly is possible, but oil cannot be fed into the rectifier from the back of the unit and all AC and DC connections cannot be in the same area
Solution Approach 1:
The single-piece diode pack housing design provides universal adaptability by allowing coolant (oil) to be fed into the rectifier from either the front or back of the unit through integrated coolant passages. The housing structure accommodates all AC and DC connections in the same area, enabling versatile installation configurations while maintaining structural integrity.
4Volume of moving object
If the diode plate is positioned close to the bus bar (0.099″ clearance), then space is optimized, but the dielectric clearance is insufficient and requires a key feature for installation tools
Solution Approach 1:
The patent increases the dielectric clearance parameter from 0.099″ to at least 0.125″ between the diode plate and bus bar channels. This is achieved through the reconfigured 72° spacing of five bus bar channels and optimized positioning of diode plates, providing adequate electrical insulation while maintaining compact overall dimensions through efficient spatial arrangement.
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 reduces weight and complexity, increases dielectric clearance, allows for coolant flow without leaks, and accommodates all electrical connections on one end, enhancing the rectifier's performance and reliability for high-speed variable frequency generator applications.
Implementation Method 1
a diode pack disposed and retained within the interior cavity and in electrical communication with the bus bars to rectify the 3-phase AC signal to a DC signal
Implementation Method 2
a cooling fluid can be introduced into the rotating rectifier assembly from a first side opposite the second side to cool the rotating rectifier assembly
Implementation Method 3
coolant flow from either side, enabling more versatile and stable operation at higher speeds
Data Source
AI summary
A diode pack housing for a rotating rectifier assembly can include a body having an interior surface defining an interior cavity open on a first end and configured to contain a diode pack and a plurality of bus bar channels defined axially on or in the inner surface in the interior cavity. The plurality of bus bar channels can be five or less bus bar channels.