Electromagnetic Actuator AC-DC Power Switching

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Solution Overview

Problem

Conventional electromagnetic actuating devices driven by AC power experience significant heat loss and noise due to constant AC power supply during both actuation and holding statuses, leading to inefficiencies in electric power usage and increased current requirements.

Innovation Solution

An electromagnetic actuating device that uses AC power for actuation and switches to lower voltage DC power for holding, reducing current flow through the driving coil while maintaining operational characteristics, thereby saving energy and reducing heat loss and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If AC power is continuously supplied to driving coils during both actuation and holding statuses, then electromagnetic actuating force is maintained, but heat loss and electric power consumption increase significantly

Engineering Contradiction:

Improveelectromagnetic actuating forceVSAvoidheat loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies dynamics by switching the power supply mode from static AC to dynamic DC based on the operational state. During actuation, AC power provides strong electromagnetic force, while during holding, DC power maintains the magnetic field with reduced current. This dynamic transition resolves the contradiction between maintaining reliable electromagnetic force and reducing energy loss.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the electrical parameters (power type, voltage, current) of the driving coils based on operational requirements. By transitioning from AC power with higher current during actuation to DC power with lower current during holding, the system maintains necessary electromagnetic force while significantly reducing heat loss and energy consumption.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If AC power is used for holding electrification, then electromagnetic force is maintained, but current requirement increases causing greater overall heat loss

Engineering Contradiction:

Improveelectrification holdingVSAvoidcurrent consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the electrical parameters from AC to DC for the holding phase. DC power provides stable current with lower RMS value compared to AC, reducing I²R losses in the coils while maintaining the magnetic field strength necessary for holding electrification, thus reducing overall current consumption and energy use.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements periodic action by alternating between AC power during actuation and DC power during holding. This periodic switching optimizes energy usage by applying high-power AC only when necessary for initial actuation, then transitioning to low-power DC for sustained holding, thereby reducing overall current consumption.

Inventive Principle:

Principle #19Periodic action

3Reliability

If constant AC power is supplied to driving coils, then electromagnetic actuating effect is maintained, but electromagnetic vibration noise increases

Engineering Contradiction:

Improveelectromagnetic actuating effectVSAvoidelectromagnetic vibration noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the power supply parameters from AC to DC during the holding phase. DC power produces a steady magnetic field without the alternating polarity reversals characteristic of AC, thereby eliminating the electromagnetic vibrations and associated noise while maintaining the actuating effect through sustained magnetic field presence.

Inventive Principle:

Principle #35Parameter changes

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 approach effectively reduces electric power consumption and heat generation while minimizing electromagnetic vibration noise, ensuring the electromagnetic actuating device operates efficiently and effectively.

Implementation Method 1

driving coil being electrically actuated by AC power input from the power source device to produce a larger electromagnetic actuating force

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

switched to allow the driving coil to hold electrification by lower voltage DC power from the power source device for excitation

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS8130482B2Electromagnetic actuating device being actuated by AC power and held by DC power

Publication Date: 2012.03.06 YANG TAI HER

AI summary

The present invention is disclosed by that the power source device is operatively controlled by the switching device to supply AC power to excite the driving coil thereby producing larger electromagnetic effect to obtain actuating force, and after actuation, the power source device being operatively controlled by the switching device is switched to provide DC power output of lower voltage to the driving coil thereby passing smaller current to maintain excitation while required operating characteristics of the electromagnetic actuating device are still ensured.