Power Converter Sensor Housing Layout for Thermal Isolation
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Solution Overview
Problem
In power converters, the integration of busbars and sensors in a single housing leads to excessive heat transfer, causing temperature rises that degrade the precision of current detection in electrical-machine sensors, particularly when a heat-generating reactor is present.
Innovation Solution
The power converter design separates the converter-sensor housing from the electrical-machine-sensor housing, preventing heat transfer and allowing for independent accommodation of converter and electrical-machine busbars and sensors, which reduces temperature increases and crosstalk between sensor portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If busbars and sensors are integrated in a single housing, then device complexity is reduced and space is saved, but heat transfer causes temperature rise that degrades sensor measurement precision
Solution Approach 1:
The patent divides the housing into two separate portions: a first housing portion accommodating the converter busbar and converter sensor, and a second housing portion accommodating the electrical-machine busbar and electrical-machine sensor. This segmentation prevents heat transfer from the converter busbar to the electrical-machine sensor, thereby maintaining measurement precision while still providing an integrated housing structure.
2Power
If converter busbar is connected to heat-generating reactor, then power conversion function is achieved, but temperature of converter busbar rises excessively
Solution Approach 1:
The patent segments the housing to isolate the converter busbar (which is connected to the heat-generating reactor) from the electrical-machine sensor. The first housing portion contains the converter busbar and converter sensor, while the second housing portion contains the electrical-machine busbar and electrical-machine sensor. This segmentation prevents heat transfer from the converter busbar to the electrical-machine sensor, thereby maintaining measurement precision despite the temperature rise in the converter busbar.
3Volume of moving object
If electrical-machine sensor is placed near converter busbar, then compact design is achieved, but crosstalk between sensor portions increases
Solution Approach 1:
The patent divides the housing into two separate portions to spatially separate the converter sensor and electrical-machine sensor. The first housing portion accommodates the converter busbar and converter sensor, while the second housing portion accommodates the electrical-machine busbar and electrical-machine sensor. This segmentation reduces crosstalk between sensor portions while maintaining a compact integrated housing design.
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 separation effectively suppresses heat transfer from the converter busbar to the electrical-machine sensor, maintaining sensor precision and reducing crosstalk, while also enhancing vibration resistance and reducing physical size by using coreless current sensors.
Implementation Method 1
The converter sensor is a coreless sensor that detects a current flowing through the converter based on a magnetic field
Implementation Method 2
The electrical-machine sensor is a coreless sensor that detects a current flowing through the electrical-machine busbar based on a magnetic field
Data Source
AI summary
A power converter includes an inverter, a converter, an electrical-machine busbar, an electrical-machine sensor, an electrical-machine-sensor housing, a converter, a converter busbar, a converter-sensor housing. The inverter supplies a three-phase alternating current to a rotating electrical machine. The converter converts a voltage between a direct current power supply and the inverter. The electrical-machine busbar passes a current between the inverter and the rotating electrical machine. The electrical-machine sensor detects the current flowing through the electrical-machine busbar based on a magnetic field. The electrical-machine-sensor housing accommodates the electrical-machine sensor and the electrical-machine busbar together. The converter sensor detects the current flowing through the converter based on a magnetic field. The converter-sensor housing is disposed apart from the electrical-machine-sensor housing, and accommodates the converter sensor and the converter busbar together.