Electric Scroll Compressor Inverter Insulation and Noise Control
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Solution Overview
Problem
Electric compressors in battery-powered vehicles face challenges with high noise levels, efficiency, and reduced battery life due to high-speed operation, as well as issues with current leakage and insulation of electronic circuits.
Innovation Solution
The electric compressor design includes a housing with an inverter protective layer, a motor, and a compression device, featuring a concentric protrusion on the drive shaft to reduce noise and stress, an oil separator to smooth refrigerant flow, and an inverter module to convert DC power to AC power efficiently, with a protective layer to insulate electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric compressor operates at high speed to improve cooling efficiency, then productivity increases, but noise level increases and battery life decreases
Solution Approach 1:
The patent introduces an inverter module as an intermediary device between the battery and motor. This inverter module enables precise control of motor speed, allowing the compressor to operate efficiently at lower speeds when full cooling capacity is not needed, thereby reducing noise while maintaining adequate cooling performance. The inverter acts as a mediator that decouples the direct relationship between battery power and motor speed.
2Productivity
If the electric compressor operates at high speed to improve cooling efficiency, then productivity increases, but battery life decreases due to increased energy consumption
Solution Approach 1:
The patent implements dynamic speed control of the motor through the inverter module. Instead of operating at constant high speed, the compressor motor dynamically adjusts its rotation speed based on actual cooling demands. This dynamic operation allows the system to maintain high cooling efficiency when needed while consuming less battery energy during normal operation, thereby extending battery life.
3Reliability
If the aluminum cover is used to protect and electrically insulate the circuitry, then reliability improves, but weight increases and noise generation increases
Solution Approach 1:
The patent replaces the solid aluminum cover with a composite structure consisting of a plastic housing and an integrated foam inlay. This composite material solution provides both mechanical protection and electrical insulation for the circuitry, while significantly reducing weight compared to solid aluminum. The foam material inherently provides both protective and insulating functions.
4Ease of operation
If the motor windings pass through coolant to connect to drive circuit, then ease of operation improves, but current leakage and energy loss increase
Solution Approach 1:
The patent introduces a sealed feedthrough or sealed connector as an intermediary component at the motor housing. This sealed interface allows electrical connections to pass through the coolant environment without direct exposure, preventing current leakage while maintaining wiring simplicity. The sealed feedthrough acts as a barrier that isolates the electrical pathway from the coolant.
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 low-noise operation, high efficiency, and extended compressor life, while reducing current leakage and maintaining battery health by optimizing power conversion and component insulation.
Implementation Method 1
The inverter module is mounted to the inverter housing and is adapted to convert direct current electrical power to alternating current electrical power
Implementation Method 2
The motor is mounted inside the housing. The compression device is coupled to the motor for receiving the refrigerant from the intake volume and compressing the refrigerant as the motor is rotated
Implementation Method 3
The compression device is coupled to the motor for receiving the refrigerant from the intake volume and compressing the refrigerant as the motor is rotated
Data Source
AI summary
An electric compressor includes a housing, refrigerant inlet port, a refrigerant outlet port, an inverter section, a motor section, a compression device and a front cover. The housing defines an intake volume and a discharge volume. The refrigerant inlet port is coupled to the housing and is configured to introduce the refrigerant to the intake volume. The compression device is a compression device configured to compress the refrigerant. The refrigerant outlet port is coupled to the housing and is configured to allow compressed refrigerant to exit the electric compressor from the discharge volume.