Inner-Rotor Magnetic Generator Design for Compact Engine Applications
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Solution Overview
Problem
Existing small generators for general-purpose engines are complex to assemble due to large, heavy ring magnets, which increase size and weight, and require intricate mounting processes.
Innovation Solution
A magnetic generator design featuring a rotor with a rotary ring-shaped yoke and integrally mounted magnet, where the magnet is enclosed within a coil, allowing for simplified mounting and reduced size and weight by positioning the rotor inside the stator, with a flange and stepped parts for stable assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large-diameter ring magnet is mounted to the outer-mass part of the flywheel, then the magnetic generator can generate sufficient power, but the generator becomes large and heavy
Solution Approach 1:
The patent inverts the conventional arrangement by placing the rotor inside the stator instead of the stator surrounding the rotor externally. This inversion allows the magnet to be positioned at the inner circumference of the stator, reducing the overall diameter and weight of the generator while maintaining the magnetic field interaction necessary for power generation
Solution Approach 2:
The rotor is nested within the stator, with the magnet mounted to the inner circumferential surface of the stator and the coil wound around the iron core inside the rotor. This nested configuration maximizes space utilization and reduces the external dimensions of the generator, achieving both compact size and sufficient power output
2Power
If a large-diameter ring magnet is used, then the magnetic generator can generate sufficient power, but the mounting process becomes complex requiring holders and multiple assembly steps
Solution Approach 1:
The magnet is merged with the stator structure by mounting it directly to the inner circumferential surface of the stator, eliminating the need for separate holders. This integration simplifies the assembly process to a single mounting step while maintaining secure fixation of the magnet
Solution Approach 2:
By inverting the arrangement and mounting the magnet to the stator instead of the rotor, the patent simplifies the mounting process. The magnet is fixed to the stationary stator structure, which provides inherent support and eliminates the need for additional holding components required in conventional designs
3Weight of stationary object
If the rotor is disposed on the inside of the stator with the magnet enclosed in the coil, then the generator size and weight are reduced, but the magnet diameter must be minimized
Solution Approach 1:
The rotor is nested within the stator, with the magnet positioned at the inner circumference of the stator and the coil wound around the iron core inside the rotor. This nested arrangement allows the magnet to have a smaller effective diameter while maintaining the magnetic field interaction necessary for power generation, thereby reducing overall generator size and weight
Solution Approach 2:
By inverting the conventional arrangement and placing the magnet on the inner circumference of the stator rather than the outer circumference of the rotor, the patent reduces the magnet's effective diameter and the overall generator dimensions while maintaining sufficient power generation capability
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 design results in a small, lightweight generator with easy magnet mounting, maintaining efficient power generation and reducing the generator's overall size and weight, suitable for general-purpose engines and other applications.
Implementation Method 1
When the crankshaft 103 rotates, electrical generation begins because the magnet 101 rotates relative to the coil 102.
Data Source
AI summary
A magnetic generator, or a so-called inner-rotor generator, provided with a rotor on the inside of a stator. The rotor has a ring-shaped yoke and a magnet integrally mounted in advance to the outer circumferential surface of the yoke. The rotor is mounted to a hub spindle of a rotating body.