Electric Motor Housing Sleeve With Inner Annular Cooling Path
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Solution Overview
Problem
Existing external rotor motors with internally cooled stators face challenges in achieving high performance, compact design, and high speeds while maintaining effective cooling and bearing support.
Innovation Solution
A housing component for electric motors that includes a stator holder, an inner part forming a sleeve for the shaft, and an inner annular space between the stator holder and the sleeve, allowing for improved shaft mounting, stator cooling, and bearing support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact design with internally cooled stator is used, then high performance and space efficiency are achieved, but cooling effectiveness and bearing support are compromised
Solution Approach 1:
The housing component is segmented into multiple functional zones: the stator holder for stator mounting, the sleeve formed by the inner part for shaft mounting, and the inner annular space for cooling duct routing. This segmentation allows each zone to independently fulfill its function while maintaining overall compactness.
Solution Approach 2:
The cooling duct is routed through the inner annular space between the stator holder and the sleeve, utilizing the radial dimension rather than requiring additional axial length. This three-dimensional cooling path enables effective stator cooling without increasing the motor's overall size.
2Reliability
If shaft mounting is improved with better bearing support, then reliability and speed capability increase, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The housing component merges multiple functions into a single integrated structure: the stator holder, the sleeve for shaft mounting, and the cooling duct routing are all combined in one component. This reduces the number of separate parts while maintaining shaft mounting reliability and bearing support quality.
Solution Approach 2:
The inner part of the housing component serves multiple purposes: it forms the sleeve that holds the shaft, creates the inner annular space for cooling, and provides structural support for the bearing. This multi-functionality reduces overall device complexity while improving shaft mounting quality.
3Reliability
If multiple bearings are arranged at greater distance for improved shaft support, then shaft mounting reliability improves, but the motor becomes less compact
Solution Approach 1:
Instead of increasing the axial length of the shaft to accommodate multiple bearings at greater distance, the invention utilizes the radial dimension by routing the cooling duct through the inner annular space. This allows improved bearing support while maintaining compact shaft length through three-dimensional space utilization.
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
The proposed housing component enhances shaft mounting, enables efficient stator and bearing cooling, and allows for a more compact design while maintaining high performance and speed.
Implementation Method 1
a cooling duct passing through an interior space surrounded by the stator
Implementation Method 2
cooling liquid flows through the cooling duct
Implementation Method 3
The housing component may have an inlet and an outlet for cooling liquid
Implementation Method 4
the space surrounded by the stator can be used both for cooling the stator and for cooling the bearing of the shaft
Data Source
AI summary
A housing component for an electric motor is described, comprising a stator receptacle for a stator of the electric motor and an inner part which projects into the stator receptacle. The inner part forms a sleeve for receiving a shaft of the electric motor and an inner annular space, which is arranged between the stator receptacle and the sleeve. In addition, an electric motor with such a housing component is disclosed.