Inverter Bracket with Braided Wire for Inductance Reduction
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Solution Overview
Problem
In electrically-driven vehicles, inverters generating strong electromagnetic noise require grounding to reduce noise, but using insulating damping bushes for vibration isolation electrically insulates the inverter case from the vehicle body, necessitating additional wiring for grounding and increasing inductance, which worsens high-frequency noise issues.
Innovation Solution
A bracket unit comprising a metal plate bracket, a damping bush, and a braided wire is used to fix the inverter, where the braided wire is wired along the metal plate to induce a counter-magnetic field, reducing the inductance and allowing simultaneous mechanical fixation and electrical connection to the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If insulating damping bushes are used to isolate vibration between the inverter and vehicle body, then vibration isolation is improved, but electrical insulation increases inductance and worsens high-frequency noise
Solution Approach 1:
The grounding path is segmented into two parts: a low-inductance braided wire for high-frequency noise suppression and a metal plate bracket for mechanical support and alternative current path. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The metal plate bracket acts as an intermediary that provides both mechanical support and an alternative electrical path. It mediates between the insulating damping bush and the vehicle body, offering a low-inductance path for high-frequency currents while maintaining vibration isolation through the bush.
2Reliability
If additional wiring is added to ground the inverter case through the damping bush, then electrical connection is improved, but device complexity and inductance increase
Solution Approach 1:
The bracket is designed to combine mechanical fixation and electrical grounding functions into a single integrated component. The metal plate bracket simultaneously supports the inverter mechanically and provides a low-inductance path to ground, eliminating the need for separate grounding wires and reducing overall system complexity.
Solution Approach 2:
The metal plate bracket serves multiple functions: it provides mechanical support for the inverter, acts as a grounding path for high-frequency currents, and works in conjunction with the damping bush for vibration isolation. This multi-functionality reduces the number of separate components needed.
3Strength
If a metal plate bracket is used for fixation, then mechanical strength is improved, but the bracket can serve as an alternative path to reduce inductance
Solution Approach 1:
The metal plate bracket, which could potentially create electromagnetic interference, is instead utilized as a beneficial low-inductance path for high-frequency currents. The bracket's large surface area and direct connection to the vehicle body transform it into an effective grounding element that suppresses noise rather than generates it.
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 reduces the inductance of the braided wire connecting the inverter to the vehicle body, thereby minimizing high-frequency electromagnetic noise while ensuring secure fixation and electrical connection.
Implementation Method 1
the braided wire is wired along the metal plate of the bracket... When high-frequency current flows through the braided wire and a magnetic field occurs around the braided wire, induction current flows through the metal plate of the bracket along the braided wire. The induction current generates a magnetic field. The magnetic field of the induction current is in a reverse direction to the magnetic field of the braided wire, so as to offset the magnetic field of the braided wire. When the magnetic field of the braided wire is offset, an inductance of the braided wire is reduced.
Data Source
AI summary
An in-vehicle structure for an inverter includes a bracket, a damping bush, and a braided wire. The bracket is made of a metal plate, and serves as a metal fitting for fixing the inverter to a transmission (a vehicle). The damping bush is fitted between the bracket and either one of a case of the inverter and the transmission. The damping bush is made of an insulator. The braided wire electrically connects the case of the inverter to the transmission. The braided wire is wired along the metal plate of the bracket.