Rotor-Stator Radial Layout for Heat Dissipation in Electrical Machines
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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 thermal dissipation while minimizing the thickness of the rotor and reducing magnetic flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inverter device is disposed inside the stator and rotor to integrate the rotating machine and inverter device, then the device complexity is reduced, but the heat dissipation ability deteriorates
Solution Approach 1:
The patent divides the housing space into distinct regions: a first region radially inside the magnetic circuit component and a second region between the magnetic circuit component and housing. This segmentation allows different thermal management strategies for different areas, with the first region serving as the primary heat dissipation path for the inverter device
Solution Approach 2:
The patent utilizes the radial dimension to create heat dissipation pathways. By ensuring the first region has greater volume than the second region in the radial direction, the patent establishes a three-dimensional heat dissipation architecture that efficiently conducts heat from the inverter device through the magnetic circuit component to the housing
2Temperature
If the magnetic circuit component is positioned to maximize the first region volume for heat dissipation, then the heat dissipation ability improves, but the storage space for the inverter device deteriorates
Solution Approach 1:
The patent applies local quality by creating regions with different functional characteristics: the first region is optimized for heat dissipation with greater volume, while the second region accommodates the inverter device. The magnetic circuit component is strategically positioned to create this functional zonation within the housing
Solution Approach 2:
The magnetic circuit component serves as an intermediary structure that simultaneously fulfills multiple functions: it provides the magnetic path for electromagnetic operation, creates the first region for heat dissipation, and defines the boundary for the second region that houses the inverter device
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 heat dissipation capabilities, reduces the risk of magnetic saturation, and increases torque output while maintaining efficient thermal management, even with heat-generating components like capacitors.
Implementation Method 1
a rotor which includes a rotor body with a hollow portion and a magnet unit mounted on the rotor body, the rotor being retained to be rotatable; a cylindrical stator which is equipped with a stator winding including a plurality of phase-windings
Implementation Method 2
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.