Rotor End Member Airflow Layout for High-Speed Motor Cooling
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Solution Overview
Problem
The cooling of a rotor in an electric motor is challenging due to its rotation, which can limit the performance of the motor.
Innovation Solution
A rotor end member with air inlet and outlet apertures, a centrifugal fan, and rotor end members that promote air circulation through the rotor, enhancing cooling by directing air flow in opposite directions and using a centrifugal fan to accelerate air outwardly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotor rotates at high speed, then the power output increases, but the cooling efficiency deteriorates due to centrifugal forces pushing air outward
Solution Approach 1:
The rotor end member is divided into distinct functional zones: an inner section with air inlet apertures for introducing cooling air, and an outer section with air outlet apertures for discharging heated air. This segmentation allows independent optimization of air intake and exhaust paths, enabling effective cooling even at high rotational speeds where centrifugal forces dominate.
Solution Approach 2:
The invention introduces axial air flow components perpendicular to the radial centrifugal forces. By providing air inlet and outlet apertures that facilitate air movement in the axial direction through the rotor structure, the system creates a three-dimensional cooling flow pattern that overcomes the limitation of purely radial centrifugal air movement at high speeds.
2Temperature
If air cooling is implemented, then the temperature control improves, but the device complexity increases due to additional apertures and flow control structures
Solution Approach 1:
The rotor end member serves multiple functions simultaneously: it provides structural support for the rotor, acts as a mounting surface for permanent magnets, and functions as an air flow control component with integrated inlet and outlet apertures. This multi-functionality reduces the need for separate cooling components, thereby limiting the increase in device complexity while achieving effective temperature control.
Solution Approach 2:
The cooling air flow control features are merged directly into the rotor end member structure rather than being implemented as separate components. The air inlet and outlet apertures are integrated into the existing rotor end cap, combining the structural and thermal management functions in a single element to minimize additional complexity.
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
Improves cooling efficiency by promoting air circulation and heat expulsion, thereby enhancing the performance of the electric motor.
Implementation Method 1
The rotor end member conveys air into the first rotor aperture and discharges air from the second rotor aperture. The rotor end member may thereby promote air circulation through the rotor.
Implementation Method 2
using a centrifugal fan to accelerate air outwardly
Data Source
AI summary
Aspects of the present invention relate to a rotor end member (20-1, 20-2) for conveying air through a rotor (6) of an electric machine (1). The rotor end member (20-1, 20-2) has at least one air inlet aperture (23-n) for conveyance of air into one or more first rotor aperture (12-n) formed in a radially inner section (RE1) of the rotor (6). The rotor end member (20-1, 20-2) also has at least one air outlet aperture (30-n) for discharging air from one or more second rotor aperture (13A-C) formed in a radially outer section (RE2) of the rotor (6). The present invention also relates to a rotor assembly (3); an electric machine (1); and a vehicle (V).