Skin Washing Brush Control With BLDC Angle Reversal

Solution Overview

Problem

Existing skin washing apparatuses using rotary motors consume high power, increase product size, and limit uniform washing liquid contact due to unidirectional rotation, reducing portability and efficiency.

Innovation Solution

A skin washing apparatus utilizing a brushless DC electric motor that rotates forwardly and reversely at a predetermined angle, incorporating a control unit with position sensors, rectifying circuit, inverter circuit, and PWM signal generation for efficient power management and optimal washing liquid distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a rotary motor is used in the skin washing apparatus, then the washing function is achieved, but power consumption increases and product size increases

Engineering Contradiction:

Improvepower consumptionVSAvoidwashing function

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent replaces the traditional rotary motor with a voice coil motor that utilizes electromagnetic principles. The voice coil motor generates linear motion through electromagnetic force between a coil and magnet, eliminating the need for complex rotary mechanical components. This substitution reduces power consumption while maintaining the washing function through vertical linear motion of the washing brush.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the motion parameter from rotary motion to linear vertical motion. By controlling the voice coil motor to move the washing brush vertically up and down, the system achieves effective washing action with reduced power consumption and smaller product size compared to traditional rotary motors.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a rotary motor is used in the skin washing apparatus, then the washing function is achieved, but the product size increases reducing portability

Engineering Contradiction:

Improvewashing functionVSAvoidproduct size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent replaces the traditional rotary motor with a voice coil motor that utilizes electromagnetic principles. The voice coil motor generates linear motion through electromagnetic force between a coil and magnet, eliminating the need for complex rotary mechanical components. This substitution reduces power consumption while maintaining the washing function through vertical linear motion of the washing brush.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the motion parameter from rotary motion to linear vertical motion. By controlling the voice coil motor to move the washing brush vertically up and down, the system achieves effective washing action with reduced power consumption and smaller product size compared to traditional rotary motors.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If the washing brush rotates in one direction only, then the motor operation is simple, but washing liquid contact uniformity is limited

Engineering Contradiction:

Improvemotor operationVSAvoidwashing liquid contact uniformity

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent implements periodic bidirectional motion where the washing brush moves vertically upward and then downward in repeated cycles. This periodic up-and-down motion ensures that washing liquid is uniformly distributed and contacted across the skin surface, improving washing effectiveness while maintaining simple motor control through forward-reverse operation modes.

Inventive Principle:

Principle #19Periodic action

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 brushless DC motor system reduces power consumption, enhances portability, and maximizes washing liquid contact with the skin by enabling bidirectional rotation of the washing brush, improving washing efficiency and convenience.

Implementation Method 1

a brushless electric motor installed inside the case to be operated by electric power received from the power supply so as to be rotated forwardly and reversely

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9578998B2Skin washing machine using brushless DC motor, method of controlling same, and program recording medium for performing the controlling method

Publication Date: 2017.02.28 AMOREPACIFIC CORP

AI summary

Disclosed is a skin washing apparatus using a brushless DC motor, including: a case for the skin washing apparatus; an operation unit installed outside the case, for commanding an ON/OFF operation of the skin washing apparatus and an switching operation for forward and reverse rotations in unit of a predetermined angle; a brushless DC motor installed inside the case to be operated by electric power received from the power supply so as to be rotated forwardly and reversely in unit of a predetermined angle; a control unit for outputting an electrical signal for controlling forward and reverse rotations of the brushless electric motor by a predetermined angle in response to a switching signal of the operation unit; and a skin washing brush mounted on a shaft of the brushless electric motor to be rotated forwardly and reversely according to an operation of the brushless electric motor.