Diesel Generator Field Winding Voltage Regulation

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Solution Overview

Problem

Diesel generators with permanent magnet generators (PMGs) face increased manufacturing costs and longer design periods due to the need for imported components and individual shaft design, leading to compromised load capacity and harmonic frequency interference issues.

Innovation Solution

A diesel generator design that replaces PMGs with a field magnet and armature configuration, utilizing an automatic voltage regulator driven by power suppliers such as inverters and starting batteries to convert rotational energy into electric energy, allowing for improved load capacity and harmonic frequency interference blocking without altering the rotating shaft design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a permanent magnet generator (PMG) is used to supply power to the automatic voltage regulator, then stable output voltage is achieved, but manufacturing costs increase and manufacturing time is extended

Engineering Contradiction:

Improvestable output voltageVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent extracts the permanent magnet generator component from the system and replaces it with a field winding-based excitation system. The main generator's field winding serves dual purposes: generating the main output and providing excitation power to the automatic voltage regulator, eliminating the need for a separate PMG and reducing manufacturing costs.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The field winding of the main generator is designed to serve multiple functions: generating the main electrical output and simultaneously providing excitation power to the automatic voltage regulator. This multi-functional design eliminates the need for a separate PMG component while maintaining stable voltage regulation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a permanent magnet generator (PMG) is used to supply power to the automatic voltage regulator, then stable output voltage is achieved, but the design period is extended

Engineering Contradiction:

Improvestable output voltageVSAvoiddesign period

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent removes the PMG component from the design, thereby eliminating the need for individual shaft design and imported components. This simplification directly reduces the design period while maintaining the essential function of stable voltage regulation through the field winding system.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of manufacture

If no permanent magnet generator is used to reduce costs, then manufacturing cost decreases, but load capacity deteriorates

Engineering Contradiction:

Improvemanufacturing costVSAvoidload capacity

Core Design Contradiction:

Ease of manufactureVSPower

Solution Approach 1:

The patent changes the excitation system parameters by using a field winding-based system instead of a PMG. The field winding is designed with optimized turns and resistance to provide sufficient excitation current to the automatic voltage regulator, maintaining load capacity while reducing manufacturing costs.

Inventive Principle:

Principle #35Parameter changes

4Ease of manufacture

If no permanent magnet generator is used to reduce costs, then manufacturing cost decreases, but harmonic-frequency interference cannot be blocked

Engineering Contradiction:

Improvemanufacturing costVSAvoidharmonic-frequency interference

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary field winding system between the main generator and the automatic voltage regulator. This field winding acts as a mediator that provides isolated excitation power, blocking harmonic-frequency interference from the main generator output from affecting the voltage regulation system, while still eliminating the need for an imported PMG.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enhances load capacity, improves inductive load response, blocks harmonic frequency interference, reduces manufacturing time, and eliminates the need for imported PMGs, while providing stable voltage regulation using various power suppliers.

Implementation Method 1

a generator body including a field magnet and an armature and configured to convert rotational energy of a diesel engine main body into electric energy

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

an automatic voltage regulator configured to control power supplied to a field winding and to control output voltage of the generator body

Methodology Applied

Scientific EffectElectromagnetic field: Magnetic Field

Data Source

PatentUS11342811B2Diesel generator with improved load capacity

Publication Date: 2022.05.24 PARK GI BONG

AI summary

A diesel generator with an improved load capacity according to one embodiment may include a generator body including a field magnet and an armature, and configured to convert rotational energy of a diesel engine main body into electric energy; and an automatic voltage regulator configured to control power supplied to a field winding and to control output voltage of the generator body. The automatic voltage regulator is driven by a power supplier configured to supply constant voltage or current based on power storage and conversion. According to the present disclosure, the diesel generator may have a load capacity without a PMG.