Electromagnet Winding Regenerated Power Consumption

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Solution Overview

Problem

Conventional turbo-molecular pumps for semiconductor manufacturing and electronic microscopes require a regeneration resistor for managing regenerated power, leading to increased size and cost due to the need for additional installation space and switching elements.

Innovation Solution

The electromagnetic rotating apparatus consumes regenerated power through an electromagnet winding, eliminating the need for a regeneration resistor by increasing the bias current during voltage overshoot, thus miniaturizing the control apparatus and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a regeneration resistor is used to manage regenerated power, then voltage stability is improved, but device size and manufacturing cost increase due to additional installation space and switching elements

Engineering Contradiction:

Improvevoltage stabilityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the regeneration resistor from the system by redirecting the regenerated power flow through the electromagnet winding. This removes the need for separate voltage management components while maintaining voltage stability through the natural resistive characteristics of the electromagnet winding.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The electromagnet winding serves dual functions: it generates the magnetic field necessary for rotor shaft positioning and simultaneously acts as a load to consume regenerated power during voltage overshoot conditions. This multi-functionality eliminates the need for dedicated regeneration management components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a regeneration resistor is used to manage regenerated power, then voltage stability is improved, but manufacturing cost increases due to additional switching elements and installation space

Engineering Contradiction:

Improvevoltage stabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention utilizes the existing electromagnet winding as a dissipative element for regenerated power, effectively using a component that would otherwise be idle during regeneration. This approach is more cost-effective than adding dedicated regeneration management hardware.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If bias current is increased to consume regenerated power, then voltage overshoot is prevented, but energy consumption increases

Engineering Contradiction:

Improvevoltage stabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The invention converts the harmful effect of regenerated power causing voltage overshoot into a beneficial effect by using it to increase bias current. This increased bias current strengthens the magnetic field for more precise rotor shaft positioning, thereby transforming energy that would be wasted into a useful function.

Inventive Principle:

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

Solution Approach 2:

The system uses its own electromagnet winding to consume the regenerated power, making the system self-regulating. The increased bias current automatically serves to both consume the excess energy and enhance the positioning capability, eliminating the need for external regulation mechanisms.

Inventive Principle:

Principle #25Self-service

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 solution allows for a compact control apparatus with reduced costs by consuming regenerated power within the electromagnet winding, preventing voltage increases and maintaining stable operation without the regeneration resistor.

Implementation Method 1

an electromagnet through which, as an excitation current, a displacement current generated in accordance with a positional deviation of the rotor shaft and superimposed on a bias current is passed

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a magnetic bearing control circuit that increases the bias current that excites the electromagnet, based on the detection signal that is output by the detection signal output means

Methodology Applied

Scientific EffectElectromagnetism: Electromagnet

Data Source

PatentUS10876540B2Electromagnetic rotating device and vacuum pump equipped with electromagnetic rotating device

Publication Date: 2020.12.29 EDWARDS JAPAN

AI summary

An electromagnetic rotating apparatus may include an electromagnet winding that consumes power generated during regeneration. A motor voltage monitoring circuit detects that a voltage at a motor driving main circuit is higher than a voltage during normal operation, due to overshoot or the like after arrival at a set speed during deceleration or acceleration of a motor. The motor voltage monitoring circuit transmits a high-voltage detection signal to a braking current adjusting circuit and a magnetic bearing control circuit. Upon receiving the high-voltage detection signal, the braking current adjusting circuit reduces a braking current command value for the motor so as to maintain an excitation voltage for the motor constant or reduce this excitation voltage, and an amplifier control circuit in the magnetic bearing control circuit increases a bias current flowing through an electromagnet winding to increase power consumption.