Inverter-Integrated Compressor Noise Isolation
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Solution Overview
Problem
Inverter-integrated electric compressors face electromagnetic noise interference due to the close proximity of high-voltage-system components, which can cause malfunctions, and existing solutions that separate these components compromise ease of assembly and compactness.
Innovation Solution
The inverter is divided into two accommodating sections: one for the inverter module with semiconductor switching devices and a CPU board, and another for high-voltage-system components like common-mode and normal-mode coils and smoothing capacitors, which are separately housed on the periphery of the compressor housing to block electromagnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inverter circuit section and high-voltage-system components are accommodated together in one inverter accommodating section, then the compressor size is reduced and ease of mounting is improved, but electromagnetic noise interference occurs causing inverter malfunctions
Solution Approach 1:
The inverter accommodating section is divided into a first accommodating section for the inverter circuit section and a second accommodating section for high-voltage-system components. This segmentation physically separates the circuit board from noise-generating components while maintaining overall compactness of the compressor unit.
Solution Approach 2:
The high-voltage-system components (inductor coil and smoothing capacitor) are extracted from the common accommodating space and placed in a separate second accommodating section. This extraction removes the source of electromagnetic noise from proximity to the sensitive inverter circuit section.
2Reliability
If the inverter circuit section and high-voltage-system components are separately disposed to eliminate electromagnetic noise, then reliability is improved, but ease of assembly is impaired and size reduction is hindered
Solution Approach 1:
The first and second accommodating sections are merged into a single integrated inverter accommodating section that is provided as one unified structure on the periphery of the housing. This merging maintains ease of assembly while internally separating the circuit section from high-voltage components through the divided accommodation spaces.
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 configuration effectively prevents inverter malfunctions by blocking electromagnetic noise while maintaining ease of assembly and compactness, allowing for a reliable and lightweight compressor design.
Implementation Method 1
an inverter that converts DC power supplied from a high-voltage power supply to three-phase AC power and feeds the three-phase AC power to the electric motor
Implementation Method 2
high-voltage-system components, such as an inductor coil and a smoothing capacitor, which are provided on a high-voltage line for supplying DC power supplied from the high-voltage power supply to the inverter circuit section to reduce the switching noise and current ripples of the inverter
Data Source
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AI summary
An inverter-integrated electric compressor in which noise interference with an inverter circuit section due to electromagnetic noise generated from high-voltage-system components can be reliably eliminated without impairing the ease of assembly and a reduction in size. In an inverter-integrated electric compressor (1) provided with an inverter accommodating section (9) on the periphery of a housing (2) and an inverter (20) provided therein, the inverter accommodating section (9) is divided into a first accommodating section (9) accommodating an inverter module (21) equipped with a power system board on which semiconductor switching devices etc. are mounted and a CPU board on which a control and communication circuit etc. are mounted, and a second accommodating section (40) accommodating high-voltage-system components (30), such as a common-mode coil (35), a normal-mode coil (36), and a smoothing capacitor (37), provided on a high-voltage line (34) for supplying DC power from a high-voltage power supply to the inverter module(21), the accommodating sections (9) and (40) being separately provided on the periphery of the housing (2).