Motor Controller Terminal Layout for Low Stray Inductance

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Solution Overview

Problem

Electrical devices in AC circuits generate stray inductance due to electromagnetic induction, leading to losses, signal attenuation, and reduced stability, affecting the functionality of other devices in the circuit.

Innovation Solution

The electrical device design includes first and second connection terminals with opposing current directions, arranged at intervals and intersecting planes, with insulating sheets in between, to cancel out magnetic fields and reduce stray inductance, and improve the stability and anti-interference ability of the electrical device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional connection terminals are used in AC circuits, then electrical connection is achieved, but stray inductance is generated causing losses and signal attenuation

Engineering Contradiction:

Improvecircuit lossesVSAvoidstray inductance

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The connection terminal is divided into multiple connection portions (first connection portions and second connection portions) arranged in parallel. Each connection portion carries a portion of the current, and their magnetic fields are arranged to oppose each other, thereby reducing the total stray inductance of the connection terminal structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first connection portions and second connection portions are positioned asymmetrically with respect to each other in space, creating opposing magnetic field directions. This asymmetric arrangement ensures that the magnetic fields generated by current flow in opposite directions, enabling cancellation of stray inductance effects.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If conventional connection terminals are used, then electrical connection is established, but stability and anti-interference ability are reduced

Engineering Contradiction:

Improvestability and anti-interference abilityVSAvoidelectromagnetic interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The asymmetric spatial arrangement of first and second connection portions creates opposing magnetic fields that cancel each other out. This reduces electromagnetic radiation and interference, thereby improving the stability and anti-interference ability of the electrical device.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The magnetic fields generated by the connection portions, which would normally be harmful stray inductance, are strategically arranged to oppose each other. This converts the harmful magnetic fields into a beneficial cancellation effect, reducing electromagnetic interference and improving reliability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If multiple connection portions are arranged at intervals, then magnetic field cancellation is improved, but device complexity increases

Engineering Contradiction:

Improvestray inductanceVSAvoidconnection terminal structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The connection terminal is segmented into multiple connection portions that can be independently formed and positioned. This segmentation allows for optimized magnetic field cancellation while maintaining a modular structure that can be integrated into existing electrical devices with minimal additional complexity.

Inventive Principle:

Principle #1Segmentation

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 design effectively cancels out magnetic fields, reducing stray inductance, enhancing stability and anti-interference capabilities, and allows for accurate current data collection and evaluation.

Implementation Method 1

Electrical devices in an AC circuit inevitably generate stray inductance under the electromagnetic induction effect

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentEP4675657A1Electrical device, electrical device assembly, motor controller and vehicle

Publication Date: 2026.01.07 BYD CO LTD

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AI summary

A vehicle, having a motor controller. The motor controller has an electrical device assembly, the electrical device assembly having an electrical device. The electrical device comprises a first electrical device body, first connection terminals and second connection terminals. The first connection terminals comprise first connection parts protruding from the first electrical device body in a first direction, and the second connection terminals comprise second connection parts protruding from the first electrical device body in the first direction, each first connection part and a second connection part being stacked in a second direction intersecting the first direction, there being a plurality of first connection parts and a plurality of second connection parts, and the plurality of first connection parts and the plurality of second connection parts all being arranged at intervals.