Filtering Assembly Layout to Prevent Magnetic Ring Saturation

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Solution Overview

Problem

The existing filtering assemblies in motor drive systems struggle to meet filtering requirements for both driving and boost charging modes, leading to magnetic ring saturation and overheating, which results in filtering failure.

Innovation Solution

A filtering assembly is designed with N alternating current metal bars stacked and a boost metal bar positioned alongside, both surrounded by a magnetic ring. This configuration ensures that magnetic fields generated by the metal bars cancel each other out in both driving and boost charging modes, preventing magnetic ring saturation and overheating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a relay is added and motor winding is used as boost inductor to integrate DC boost function, then the motor drive system can achieve both driving and boost charging modes, but the filtering assembly structure cannot meet filtering requirements for both modes, causing magnetic ring saturation and overheating

Engineering Contradiction:

Improvedual-mode operation capabilityVSAvoidfiltering effectiveness

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The filtering assembly is segmented into multiple alternating current metal bars (N bars) and a boost metal bar, with each bar independently positioned within the magnetic ring. This segmentation allows different bars to carry different currents in different modes, enabling the filtering assembly to adapt to both driving and boost charging modes without saturation or overheating.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the filtering assembly structure is optimized for driving mode, then filtering effect is good in driving mode, but it cannot meet filtering requirements in boost charging mode, leading to magnetic ring saturation

Engineering Contradiction:

Improvefiltering effect in driving modeVSAvoidfiltering capability in boost charging mode

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The filtering assembly is designed with universal applicability to both driving and boost charging modes. The magnetic ring surrounds both the alternating current metal bars and the boost metal bar, allowing the same structure to effectively filter currents in both modes. The N alternating current metal bars and boost metal bar are configured to cancel magnetic fields in both modes, preventing saturation while maintaining filtering effectiveness.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If metal bars are arranged in a conventional configuration, then the structure is simple, but magnetic fields are not evenly distributed, causing local saturation and overheating of the magnetic ring

Engineering Contradiction:

Improvestructural simplicityVSAvoidmagnetic ring temperature uniformity

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The metal bars are arranged asymmetrically within the magnetic ring, with N alternating current metal bars and a boost metal bar positioned at different locations. This asymmetric arrangement ensures that magnetic fields are evenly distributed throughout the magnetic ring, preventing local saturation and overheating while maintaining structural simplicity.

Inventive Principle:

Principle #4Asymmetry

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 filtering assembly effectively mitigates filtering failures caused by magnetic ring saturation and overheating, ensuring a better filtering effect and higher reliability in both driving and boost charging modes.

Implementation Method 1

magnetic fields generated by the N alternating current metal bars carrying the alternating current cancel each other out

Methodology Applied

Scientific EffectMagnetic field cancellation: Magnetic Field

Implementation Method 2

magnetic fields generated by the current in the boost metal bar and the N alternating current metal bars cancel each other out in the magnetic ring

Methodology Applied

Scientific EffectMagnetic field cancellation: Magnetic Field

Data Source

PatentUS20250182941A1Filtering assembly, inverter, motor drive system, and vehicle

Publication Date: 2025.06.05 CONTEMPORARY AMPEREX INTELLIGENCE TECHNOLOGY (SHANGHAI) LTD

AI summary

A filtering assembly includes N alternating current metal bars, a boost metal bar, and a magnetic ring. At least some of the N alternating current metal bars are stacked, N being an integer greater than 1. The boost metal bar is disposed at a side of the N alternating current metal bars. The magnetic ring surrounds the N alternating current metal bars and the boost metal bar, where in the magnetic ring, the N alternating current metal bars are spaced apart from and opposite to the boost metal bar.