Electric Motor Housing With Annular Cooling for Stator and Bearings
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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 simultaneously.
Innovation Solution
The electric motor design incorporates a stator with stator windings, a rotor with permanent magnets, a shaft with bearings, and a housing with a cooling channel that cools both the stator and the bearings, allowing for improved cooling efficiency and bearing support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling channel runs through the interior surrounded by the stator, then cooling efficiency for the stator is improved, but the device complexity increases due to additional housing components needed to define the cooling channel
Solution Approach 1:
The patent merges the housing structure with the cooling channel definition by forming the cooling channel directly within the housing components. The first housing component forms a base and an inner part that projects into the stator, while the second housing component forms a cover, and together they define the cooling channel space without requiring separate cooling channel components.
Solution Approach 2:
The housing components serve multiple functions: they provide structural enclosure for the motor, support the shaft and bearings, and simultaneously define the cooling channel geometry. The first housing component both supports the shaft end/bearing and creates the cooling channel passage through its inner part projection.
2Reliability
If the inner part of the first housing component projects into the stator to form a sleeve, then bearing support is improved, but the manufacturing complexity increases
Solution Approach 1:
The housing is divided into functional segments: the first housing component forms both the base and the inner part (sleeve), while the second housing component forms the cover. This segmentation allows the sleeve to be integrated into the housing structure, providing bearing support while maintaining manufacturing feasibility through modular assembly.
3Reliability
If multiple bearings are arranged at greater distances on the shaft, then bearing reliability is improved, but the shaft length increases
Solution Approach 1:
The patent optimizes bearing arrangement by utilizing the radial dimension through the sleeve structure formed by the inner part of the housing. This allows bearings to be positioned at optimal distances for reliability while the sleeve provides structural support that accommodates the shaft configuration without simply extending shaft length in one dimension.
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 enhances cooling efficiency for both the stator and bearings, enabling higher performance, a more compact structure, and the ability to maintain high speeds while simplifying the housing structure.
Implementation Method 1
a cooling channel which leads through an interior space surrounded by the stator
Implementation Method 2
cooling liquid as well as an inner part that projects into the stator
Implementation Method 3
an annular space, which is arranged between the stator and the sleeve and in which a cooling channel section for stator cooling runs
Implementation Method 4
cooling liquid as well as an inner part that projects into the stator
Data Source
AI summary
An electric motor having a cooling channel which leads through an interior space surrounded by a stator and a housing comprises a first housing component, which forms a base opposite a first axial end of the stator, and a second housing component opposite a second axial end of the stator as a cover, and the first housing component has an inlet and an outlet for cooling liquid and an inner part which projects into the stator. The inner part forms a sleeve, in which the first end of the shaft is arranged, and the inner part also forms an annular space which is arranged between the stator and the sleeve, wherein a cooling channel section for cooling the stator extends in this annular space, and wherein at least one bearing of the shaft is arranged in the sleeve.