Motor-Driven Compressor Shielding for Communication Lead EMI
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Solution Overview
Problem
Motor-driven compressors generate significant electromagnetic noise that propagates through the communication lead, affecting external control devices due to the lack of effective noise reduction measures.
Innovation Solution
A motor-driven compressor design featuring a metal shielding member within the circuit housing, electrically grounded and covering the communication lead, which suppresses electromagnetic noise from the high voltage circuit to the low voltage communication lead, using a tubular shield formed by the shielding member and the grounded circuit housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the communication lead is drawn from the accommodation chamber without shielding, then the ease of manufacture is improved, but electromagnetic noise propagates to the external control device
Solution Approach 1:
A metal shielding member is introduced as an intermediary element between the high voltage circuit and the communication lead. The shielding member is electrically connected to ground and positioned to cover the communication lead within the accommodation chamber, thereby mediating the electromagnetic interference by providing a grounded path that redirects noise away from the communication lead.
2Object-affected harmful factors
If a metal shielding member is added to cover the communication lead, then electromagnetic noise is reduced, but the device complexity increases
Solution Approach 1:
The metal shielding member is merged with the existing circuit housing structure. The shielding member is positioned within the accommodation chamber and electrically connected to ground through the housing, combining the shielding function with the existing structural components rather than adding completely separate shielding elements.
Solution Approach 2:
The circuit housing serves multiple functions: it provides structural support, houses the drive circuit, and through its electrical connection to ground, also serves as part of the electromagnetic shielding system. The shielding member similarly provides both mechanical support within the chamber and electromagnetic protection.
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
Effectively reduces electromagnetic noise propagated to the communication lead, minimizing interference with external control devices and maintaining manufacturing cost efficiency by integrating the shielding within the existing metal circuit housing structure.
Implementation Method 1
a metal shielding member that is arranged in the accommodation chamber and covers the communication lead. The circuit housing includes a metal shielding portion, which is electrically grounded. The shielding member is electrically connected to the shielding portion.
Data Source
AI summary
A motor-driven compressor includes a housing, a compression portion, and an electric motor, a drive circuit, a circuit housing, a control circuit, a communication lead, and a metal shielding member. The compression portion and the electric motor are received in the housing. The circuit housing is arranged outside the housing and defines an accommodation chamber that receives the drive circuit. The control circuit is configured to control the electric motor by controlling the drive circuit. The communication lead is connected to the control circuit and drawn from the inside to the outside of the accommodation chamber. The metal shielding member is arranged in the accommodation chamber and covers the communication lead. The circuit housing includes a metal shielding portion, which is electrically grounded. The shielding member is electrically connected to the shielding portion.