Traction Motor Labyrinth Seal for Dust-Free Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional traction motors for rail vehicles face challenges with dust accumulation and pollution in external air intake, leading to frequent filter cleaning needs and increased maintenance labor, and size restrictions due to the addition of heat exchangers in fully enclosed designs.
Innovation Solution
A fully enclosed traction motor design with separate ventilation paths for internal and external cooling winds, utilizing a labyrinthine gap to prevent air mixing and eliminate the need for internal cleaning, while optimizing size by eliminating redundant ventilation components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional open-type motor design is used with external air intake, then cooling efficiency is improved, but dust accumulation and pollution increase requiring frequent filter cleaning
Solution Approach 1:
The motor is divided into separate enclosed compartments with independent ventilation paths. The stator core has dedicated ventilation passages that are sealed from the external environment, while the rotor maintains its own cooling path. This segmentation prevents dust-laden external air from entering the motor interior while maintaining effective cooling through controlled air flow paths.
Solution Approach 2:
The motor creates a protected internal environment by enclosing the stator and rotor in sealed housings with labyrinthine seals. This inert environment isolation prevents harmful external factors (dust, pollution) from contaminating the motor interior, while cooling is achieved through controlled ventilation passages that do not require direct exposure to external air.
2Object-affected harmful factors
If a fully enclosed motor design with heat exchanger is used, then dust accumulation is reduced, but device complexity and size increase
Solution Approach 1:
The heat exchanger component is completely removed from the motor design. Instead of using a separate heat exchanger unit, the invention utilizes integrated ventilation passages within the stator core and rotor structure itself, extracting the unnecessary heat exchanger component while maintaining cooling functionality through the motor's structural elements.
Solution Approach 2:
The motor housing and core structures serve multiple functions simultaneously. The stator core provides both magnetic flux path and integrated ventilation channels. The rotor housing serves as both structural support and cooling air passage. This multi-functionality eliminates the need for separate heat exchanger components while maintaining effective cooling.
3Object-affected harmful factors
If a fully enclosed motor design is used, then dust accumulation is reduced, but motor size increases due to redundant ventilation components
Solution Approach 1:
The ventilation passages are merged directly into the stator core and rotor housing structures. The cooling air paths are integrated with the magnetic core structure rather than being separate components. This merging eliminates redundant ventilation components and reduces overall motor volume while maintaining the enclosed protective design.
Solution Approach 2:
The ventilation passages are nested within the existing motor structure. The cooling channels are formed within the stator core itself and the rotor housing, utilizing the existing structural space rather than adding external ventilation components. This nesting approach maintains a compact motor size while achieving effective enclosed cooling.
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 design effectively suppresses heat generation and pollution within the motor, reduces maintenance needs, and allows for a more compact, high-performance motor with improved cooling efficiency.
Implementation Method 1
The ventilation fan 14 is mounted on a portion of the rotor shaft 6 within the motor. The ventilation fan 14 has a plurality of vanes 14a arranged radially from the center of its axis of rotation.
Implementation Method 2
The external air flows into the motor from the air intake port 1b through the ventilation filter 15, and then flows to the ventilation fan side through the ventilation passages 7a of the rotor core and the air gap 13 between the outer circumference of the rotor core 7 and the inner circumference of the stator core 11
Data Source
AI summary
According to one embodiment, a traction motor includes a stator core, a rotor core, a first bearing, a second bearing, a rotor shaft, a first ventilation passage made at an outer circumference portion of the stator core, a first fan, and a second ventilation passage to introduce external air. And, in the motor, a first minute gap is provided between an end portion of a first fan main plate and an inner circumference portion of the first bracket, cooling wind is discharged to the motor outside via the second ventilation passage, an outer circumference portion of the first fan, a ventilation portion in the first bracket and the first ventilation passage, and the second ventilation passage is made so that the cooling wind entered from the first air intake port flows around the rotor shaft portion between the first ventilation fan and the first bearing.