Brushless External Rotor Compressor for Compact Engine Intake
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Solution Overview
Problem
Existing compressors for internal combustion engines require significant construction space and weight due to their design, which is a challenge for compact motor vehicles like motorcycles.
Innovation Solution
A brushless external rotor compressor design is implemented, where the stator is accommodated within the rotor, and the compressor impeller is integrated with the rotor shaft, allowing for a compact and lightweight configuration with radial airflow to minimize space and weight requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional compressor design is used, then the compressor can effectively compress air for the internal combustion engine, but the compressor requires significant construction space and weight
Solution Approach 1:
The patent combines the electric motor and compressor into a single integrated unit where the motor drives the compressor impeller directly. The motor housing serves as the compressor housing, and the motor shaft is directly connected to the impeller shaft, eliminating the need for separate mounting spaces and reducing overall volume while maintaining both motor function and air compression capability
Solution Approach 2:
The stator is positioned inside the rotor structure, with the rotor surrounding the stator in a nested configuration. This nesting arrangement allows the magnetic components to be compactly arranged within the motor housing, maximizing space utilization and reducing the overall footprint of the compressor unit
2Weight of stationary object
If a conventional compressor design is used, then the compressor can effectively compress air for the internal combustion engine, but the compressor weight is excessive
Solution Approach 1:
The patent combines the electric motor and compressor into a single integrated unit where the motor drives the compressor impeller directly. The motor housing serves as the compressor housing, and the motor shaft is directly connected to the impeller shaft, eliminating the need for separate mounting spaces and reducing overall volume while maintaining both motor function and air compression capability
Solution Approach 2:
The housing is designed as a composite structure that serves dual functions: it provides structural support for the motor components while simultaneously acting as the compressor housing. This integrated housing design eliminates the need for separate motor housing and compressor housing, reducing overall weight while maintaining structural integrity and compression function
3Volume of moving object
If the stator is accommodated within the rotor, then the compressor size is reduced, but the magnetic field configuration becomes more complex
Solution Approach 1:
The stator is positioned inside the rotor structure, with the rotor surrounding the stator in a nested configuration. This nesting arrangement allows the magnetic components to be compactly arranged within the motor housing, maximizing space utilization and reducing the overall footprint of the compressor unit
Solution Approach 2:
The magnetic circuit is designed with localized magnetic paths using high-permeability materials in specific regions. Magnetic bridges and yokes are strategically positioned to guide and concentrate magnetic flux where needed, simplifying the overall magnetic field configuration while maintaining effective motor operation within the nested structure
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 design reduces the overall size and weight of the compressor, eliminates the need for separate cooling measures, and enhances cooling efficiency through airflow, thereby minimizing construction space and weight while maintaining effective air compression.
Implementation Method 1
The electric motor (4) has a stator (5) and a rotor (6). The rotor (6) is drivable by the stator (5) and is rotatable as a result about an axis of rotation (7) relative to the stator (5).
Implementation Method 2
The compressor has at least one, or preferably precisely one, compressor impeller (8), which is also referred to as an impeller. The compressor impeller (8) can be driven by the rotor (6) or by means of the torque and can thereby be rotated, for example, about the axis of rotation (7) and/or relative to the stator (5). Driving of the compressor impeller (8) enables air to be compressed
Data Source
AI summary
A compressor for an intake section of an internal combustion engine of a motor vehicle includes an electric motor which has a stator and a rotor where the rotor is drivable by the stator and is rotatable about an axis of rotation relative to the stator. An impeller is drivable by the rotor to compress air which is flowable through the intake section and which is to be supplied to a combustion chamber of the internal combustion engine. The rotor is a brushless external rotor such that at least one length region of the stator is disposed in at least one length region of the rotor.