Cordless BLDC Vacuum Cleaner Control for Floor-Adaptive Suction

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Solution Overview

Problem

Conventional vacuum cleaners are limited in mobility due to the length of the power cord, which restricts cleaning and movement, and require complex circuit configurations to operate high-output suction motors.

Innovation Solution

A vacuum cleaner design incorporating a battery with a maximum charging voltage exceeding 84.8 V, a charging device that converts AC to DC voltage, and a controller that adjusts suction motor operation based on floor status, allowing for increased suction force and improved mobility without a cord reel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a cord reel assembly is used to supply power to the vacuum cleaner, then power can be supplied to the main body, but the cleaner's mobility is limited by the cord length

Engineering Contradiction:

Improvepower supplyVSAvoidmobility

Core Design Contradiction:

Use of energy by moving objectVSEase of operation

Solution Approach 1:

The patent removes the cord reel assembly from the vacuum cleaner system entirely. Instead of using a cord-based power supply system, the invention employs a battery pack that can be recharged, completely extracting the problematic cord component that limited mobility. This allows the vacuum cleaner to move freely without being constrained by cord length or requiring cord management.

Inventive Principle:

Principle #2Taking out (Extraction)

2Power

If a high-output suction motor is used to increase suction force, then cleaning performance is improved, but the circuit configuration becomes complex

Engineering Contradiction:

Improvesuction forceVSAvoidcircuit configuration

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent replaces the traditional AC-powered motor system with a DC battery-powered motor system. This substitution simplifies the circuit configuration by eliminating the need for complex AC-to-DC conversion circuits, rectifiers, and associated control electronics that would be required to operate a high-output motor from AC power. The DC motor driven directly from the battery pack achieves high suction force with a simpler circuit architecture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enhances cleaning performance by increasing suction force, simplifying circuit configurations, and improving user safety and mobility by eliminating cord length limitations and enabling smooth movement without cord management.

Implementation Method 1

a battery to supply power for operating the suction motor

Methodology Applied

Scientific EffectBattery (electricity): Battery (electricity)

Implementation Method 2

a charging device that converts AC to DC voltage

Methodology Applied

Scientific EffectAC to DC conversion:

Implementation Method 3

a suction motor that generates a suction force

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Data Source

PatentUS10178933B2Vacuum cleaner

Publication Date: 2019.01.15 LG ELECTRONICS INC

AI summary

A vacuum cleaner includes a cleaner main body and a brush-less direct current (BLDC) motor that generates a suction force. A suction unit is in communication with the cleaner main body and sucks air and dust, and a battery provides power for the motor. An inverter supplies power of the battery to the motor, and a controller controls an operation of the motor. The controller determines a status of a floor and controls an operation of the motor based on the determined status of the floor.