Motor Cooling via Stator Bushing Air Conveying Element
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The cooling of motors with integrated electronics is hindered by attachment to stable structures, leading to elevated component temperatures that limit power and shorten motor lifetime, especially due to restricted airflow.
Innovation Solution
An air-conveying element connected torque-proof to the rotor with axial passage openings in the stator bushing enhances cooling by drawing in an axial air stream and directing it through the motor, particularly using a radial fan wheel to blow air radially, targeting hot regions within the motor and electronics housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the motor is attached to a stable attachment wall or supporting construction, then the motor stability is improved, but the cooling of the motor and electronics housing is hindered due to restricted airflow
Solution Approach 1:
The stator bushing is divided into functional zones: an attachment region for mechanical stability and a cooling region with passage openings for airflow. This segmentation allows the motor to maintain stable attachment while enabling effective cooling paths through the stator bushing structure.
Solution Approach 2:
The stator bushing acts as an intermediary element between the attachment wall and the motor components. It provides both mechanical support and integrated cooling channels that guide airflow to critical areas, mediating between the conflicting requirements of stable attachment and effective cooling.
2Stability of the object's composition
If the motor is attached to an attachment wall, then the motor stability is improved, but the power and lifetime of the motor are limited due to elevated component temperatures
Solution Approach 1:
The cooling passage openings are pre-integrated into the stator bushing structure before motor assembly. This preliminary design ensures that cooling paths are established in advance, preventing temperature-related degradation and extending motor lifetime from the outset.
Solution Approach 2:
The motor's own operating air stream is utilized to cool critical components. The air that passes through the motor for its operation is redirected through the stator bushing passage openings to cool the electronics housing and motor components, making the system self-cooling without requiring external cooling systems.
3Speed
If radial fans are used, then axial air intake is achieved, but the air flow around the motor and electronics housing is poor due to radial outflow
Solution Approach 1:
The cooling system utilizes the axial dimension by directing airflow through passage openings in the stator bushing, complementing the radial fan's radial outflow. This dimensional transition from radial to axial flow ensures comprehensive cooling coverage of the electronics housing and motor components.
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 active cooling method increases motor power and extends its lifetime by effectively guiding air streams to critical cooling areas, even when installed in confined spaces, and can be integrated into conventional motors without modifications.
Implementation Method 1
the air-conveying element, during motor operation, draws in an axial air volume stream through the intake opening and the passage opening on an outside wall of the electronics housing
Implementation Method 2
Such a motor allows active and targeted cooling, particularly of the electronics housing and of the motor electronics disposed in it, by means of an air volume stream generated by the air-conveying element
Data Source
AI summary
A motor, comprising an electronics housing having integrated motor electronics, a stator, and a rotor. The stator comprises a stator bushing and a laminated stator core having motor windings. The stator bushing is arranged axially between the electronics housing and the rotor. The motor according to the invention has an air-conveying element connected to the rotor in a rotationally fixed manner and at least one axially extending passage opening arranged in the stator bushing. The air-conveying element is arranged axially between the stator bushing and the rotor and has a circumferential axial intake opening on the side of the stator bushing. During motor operation, the air-conveying element sucks in an axial volumetric air flow at an external wall of the electronics housing through the intake opening and the passage opening.