Engine-Driven Welding Generator Flywheel Integration
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Solution Overview
Problem
Existing engine-driven welding systems are inefficient and costly due to the need for dedicated cooling fans, multiple shaft supports, flywheels, and frequency-dependent pole selection, which add weight and reduce efficiency.
Innovation Solution
An engine-driven welding-type power supply with a polyphase generator using permanent magnets for excitation, integrated as a flywheel, and a single shaft support, eliminating the need for a separate flywheel and cooling fan, and allowing for flexible pole selection and auxiliary power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a dedicated cooling fan is added to cool the generator, then the generator cooling is improved, but the system weight and cost increase
Solution Approach 1:
The patent combines the engine cooling fan with the generator cooling function. The single fan draws air through both the engine and generator, merging two separate cooling systems into one integrated system. This eliminates the need for a dedicated generator cooling fan, reducing system weight and component count while maintaining effective cooling for both the engine and generator.
2Stability of the object's composition
If multiple shaft supports are used to support the generator shaft, then the shaft stability is improved, but the system weight and cost increase
Solution Approach 1:
The patent removes the generator shaft support from the generator assembly and integrates it into the engine assembly. The engine crankshaft serves as the generator shaft, eliminating the need for separate generator shaft supports. This extraction of the support function to the engine reduces system weight and simplifies the overall structure while maintaining shaft stability through the engine's robust crankshaft design.
3Stability of the object's composition
If a separate flywheel is added to the engine, then the engine operation stability is improved, but the system weight and cost increase
Solution Approach 1:
The patent merges the engine flywheel function with the generator rotor. The generator rotor serves as the flywheel, combining two separate functions into a single component. This integration maintains engine operation stability through the flywheel effect while eliminating the need for a separate flywheel, thereby reducing system weight and component count.
4Adaptability or versatility
If the number of poles is selected based on desired output frequency, then the auxiliary power output is improved, but the generator design flexibility and efficiency are reduced
Solution Approach 1:
The patent employs variable frequency drive (VFD) technology to decouple the relationship between pole count and output frequency. The VFD allows the generator to operate at variable speeds, enabling the system to produce different frequencies (50Hz or 60Hz) from the same physical generator configuration. This dynamic speed control provides auxiliary power flexibility without constraining the generator design to specific pole counts, thereby maintaining design flexibility and efficiency.
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 configuration enhances efficiency and reduces costs by eliminating unnecessary components, improving power output, and enabling more efficient energy transfer while providing reliable auxiliary power.
Implementation Method 1
the generator includes a plurality of permanent magnets that create an excitation field
Implementation Method 2
the generator includes a plurality of permanent magnets that create an excitation field
Data Source
AI summary
A method and apparatus for providing engine driven welding-type power supply includes an engine, a generator, an input power circuit, a welding-type power circuit, an auxiliary power circuit and a controller. The generator includes permanent magnets that create and provides a generator output from at least one polyphase winding. The input power circuit is connected to the generator output and the welding-type power circuit is connected to the input circuit, and provides a welding-type output. The auxiliary power circuit is connected to the input circuit and provides an auxiliary power output. The controller is connected to the auxiliary power and the welding type power circuits, and can command that there be no load for the generator. The generator is connected to the engine and connected to function as a flywheel to the engine and the engine does not include a flywheel other than the generator.