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, optimizing the placement of the magnet retainer and intermediate portions to enhance heat dissipation while minimizing the thickness of the rotor and reducing electromagnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inverter device is disposed inside the stator and rotor, then the machine can be compact, but heat dissipation becomes insufficient
Solution Approach 1:
The patent divides the rotor into multiple regions: an inner region with the hollow portion for heat dissipation, a middle region with the magnet retainer, and an outer region. This segmentation allows the heat-generating inverter device to be placed in the hollow portion while maintaining compact overall dimensions, resolving the contradiction between compact size and heat dissipation capability.
Solution Approach 2:
The patent introduces an intermediate portion connecting the rotating shaft and magnet retainer, which serves as a thermal pathway. This intermediary structure facilitates heat transfer from the inverter device in the hollow portion to the rotor body and ultimately to the stator, enabling effective heat dissipation while maintaining the compact integrated design.
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 management by increasing the volume for heat dissipation, reducing the thickness of the rotor, and minimizing electromagnetic noise, thereby enhancing the overall performance and efficiency of 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... a cylindrical stator which is equipped with a stator winding including a plurality of phase-windings
Implementation Method 2
it is necessary to effectively dissipate heat... 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 in the radial direction
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.