Rotating Electrical Machine Layout for Internal Heat Dissipation
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Solution Overview
Problem
Conventional rotating electrical machines face challenges in effectively dissipating heat, particularly when heat-generating components like inverter devices are integrated, leading to inefficient thermal management.
Innovation Solution
The design incorporates a rotor with a hollow portion and a magnet unit, a cylindrical stator with phase-windings, and a housing that creates a larger heat dissipation region radially inside the magnetic circuit component, allowing for enhanced thermal dissipation by positioning the magnetic circuit components optimally and using a surface magnet type rotor with polar anisotropic magnets to minimize material usage and maximize heat release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heat-generating components like inverter devices are integrated inside the stator and rotor, then device functionality is improved, but heat dissipation becomes insufficient
Solution Approach 1:
The patent divides the rotor into multiple independent magnetic circuit components (first magnetic circuit component and second magnetic circuit component) that can be separately positioned and optimized. This segmentation allows each component to be strategically placed to maximize heat dissipation pathways while maintaining device functionality.
Solution Approach 2:
The patent utilizes radial positioning of magnetic circuit components at different distances from the rotation axis, creating a multi-dimensional heat dissipation structure. By arranging components in the radial dimension rather than just axially, the design expands heat dissipation pathways into three-dimensional space, improving thermal management while preserving device integration.
2Temperature
If magnetic circuit components are positioned closer to the rotation axis, then heat dissipation volume is increased, but magnetic saturation risk increases
Solution Approach 1:
The patent applies different positioning strategies to different magnetic circuit components based on their local requirements. The first magnetic circuit component is positioned at a specific radial distance optimized for its thermal and magnetic characteristics, while the second component is positioned at a different radial distance, allowing each component to operate in its optimal local environment without causing magnetic saturation.
Solution Approach 2:
The patent optimizes the radial positioning parameters of magnetic circuit components to achieve a balance between heat dissipation volume and magnetic field distribution. By carefully selecting the radial distances of different components from the rotation axis, the design maximizes heat dissipation while maintaining magnetic field integrity and avoiding saturation.
3Loss of substance
If surface magnet type rotor with polar anisotropic magnets is used, then material usage is reduced and heat dissipation is maximized, but magnetic saturation resistance decreases
Solution Approach 1:
The patent divides the magnetic circuit into multiple separate components positioned at different radial locations. This segmentation allows the use of surface-mounted polar anisotropic magnets in a distributed configuration, reducing total material usage while the spatial distribution provides inherent resistance to magnetic saturation through optimized flux pathways.
Solution Approach 2:
By positioning magnetic circuit components in the radial dimension at different distances from the rotation axis, the patent creates multi-dimensional magnetic flux pathways. This dimensional arrangement allows surface-mounted magnets to be used efficiently while the spatial distribution of components provides natural protection against magnetic saturation through diversified flux routes.
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 improves the machine's thermal dissipation capabilities, reduces the risk of magnetic saturation, and enhances torque output while minimizing the size and weight, thus effectively managing heat generation within the rotating electrical machine.
Implementation Method 1
a rotor which includes a rotor body with a hollow portion and a magnet unit mounted on the rotor body
Implementation Method 2
a cylindrical stator which is equipped with a stator winding including a plurality of phase-windings
Implementation Method 3
A first region, as defined radially inside an inner peripheral surface of a magnetic circuit component made of the stator and the rotor, is greater in volume than a second region, as defined between the inner peripheral surface of the magnetic circuit component and the housing
Implementation Method 4
This facilitates dissipation of more heat from first region than from the second region, thereby achieving suitable heat dissipation ability
Data Source
AI summary
A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.