Electric Supercharger Cooling via Compressor Negative Pressure
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Solution Overview
Problem
Existing electric supercharging devices face challenges in reducing windage loss and improving cooling performance, with existing solutions complicating the motor configuration and offering low cooling efficiency due to the use of high-pressure, high-temperature compressed air.
Innovation Solution
The electric supercharging apparatus incorporates a gas supply and discharge system with cooling passages that utilize negative pressure from the compressor inlet to introduce outside air for cooling, reducing windage loss and enhancing cooling efficiency without the need for energy-consuming components like pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling mechanism is added to cool the motor coil and inverter, then the cooling performance is improved, but the device complexity increases
Solution Approach 1:
The compressor serves dual functions: it compresses air for engine intake and simultaneously provides cooling air for the motor coil and inverter through the cooling passages. This multi-functionality eliminates the need for a separate cooling mechanism, resolving the contradiction between improved cooling performance and reduced device complexity
Solution Approach 2:
The cooling passages are integrated into the compressor structure, merging the cooling function with the air compression function. The motor housing and compressor housing form a unified structure where cooling passages are embedded, allowing compressed air to be directed to cooling locations without requiring separate cooling components
2Device complexity
If compressed air is used for cooling, then the cooling mechanism is simplified, but the cooling efficiency decreases due to high temperature
Solution Approach 1:
The air flow path is segmented into different zones: the cooling passages are separated from the high-temperature compression chamber, allowing cooler air to be directed specifically to the motor coil and inverter. The gas discharge port is positioned to allow selective extraction of cooler air from the compression process
Solution Approach 2:
Different regions of the compressor housing are utilized with different temperature characteristics. The cooling passages are positioned to access cooler regions near the motor housing, while the compression occurs in separate high-temperature zones. This local quality differentiation allows efficient cooling without requiring the entire system to operate at high temperatures
3Loss of energy
If the rotor surface is modified to reduce windage loss, then the power efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The rotor surface geometry is modified by changing parameters such as the shape and position of convex portions or adding grooves. These parameter changes reduce windage loss by optimizing the air flow characteristics around the rotor, while maintaining manufacturability through standard machining operations
Solution Approach 2:
The cooling passages utilize pneumatic principles to manage air flow around the rotor. By controlling the pressure and flow of cooling air through the passages, windage loss is reduced without requiring complex mechanical modifications to the rotor surface itself
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 effectively cools the motor housing and rotor shaft with outside air, reducing windage loss and improving cooling performance while maintaining a simple and efficient design.
Implementation Method 1
outside air is introduced to the first cooling passage from the gas supply port using a negative pressure of the inlet port of the compressor applied to the first cooling passage via the first intake passage
Implementation Method 2
the outside air is introduced to the first cooling passage from the gas supply port by applying the negative pressure of the inlet port of the compressor to the first cooling passage via the first intake passage, so as to cool the vicinity of the first cooling passage where heating is likely to occur (such as a stator and a motor coil)
Data Source
AI summary
It is intended to provide: an electric supercharging apparatus wherein, with a simple structure, rotor windage loss in an electric motor for driving a compressor is reduced and good cooling performance is produced; and a multi-stage supercharging system using the electric supercharging device. This electric supercharging apparatus (1) is provided with: a first cooling passage (17) formed in a stator (9) along a motor coil (11) and communicating a gas supply port (13) with a gas discharge port (14) in a motor housing (8); and a first intake passage (15) connecting the gas discharge port to an intake port (5) of a compressor (2). This electric supercharging apparatus is configured to introduce outside air into the first cooling passage via the gas supply port by applying negative pressure to the first cooling passage via the first intake passage, thereby cooling the inside of the motor housing.