Enclosed Motor Ventilation Flue with Integrated Rotation Sensor
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Solution Overview
Problem
Railroad vehicle electric motors require longer maintenance cycles, and existing designs face challenges in maintaining output due to space restrictions and dust contamination, which affects the motor's efficiency and reliability.
Innovation Solution
A totally enclosed electric motor design with a stator core, rotor core, and integrated ventilation fans and flues that prevent open air from entering, combined with a rotation detection circuit positioned within the ventilation flue to maintain cleanliness and prevent dust from reaching critical components, allowing for efficient cooling and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the speed sensor and detection part are attached to the outside of the sealing case, then the motor size can be reduced, but the motor output decreases
Solution Approach 1:
The detection part and speed sensor are nested within the ventilation flue space that already exists between the bracket and bearing housing. This allows the detection components to be positioned inside the sealed case without increasing the overall motor dimensions, thereby maintaining motor output while avoiding the need to reduce size at the expense of power.
2Reliability
If the motor is totally enclosed to prevent dust contamination, then maintenance cycles can be extended, but the detection part and speed sensor need protection from open air
Solution Approach 1:
The ventilation flue acts as an intermediary space that allows the detection part and speed sensor to be positioned within the sealed case while still enabling the ventilation function. The labyrinth seal serves as a mediator that permits air flow for cooling while blocking dust particles from reaching the internal components, thus maintaining both reliability and protection against harmful factors.
3Reliability
If the detection part is positioned within the ventilation flue, then the motor maintains its sealing integrity, but the detection circuit must be protected from ventilation air flow
Solution Approach 1:
A protective cover is provided over the detection part and speed sensor to shield them from the ventilation air flow while allowing these components to remain positioned within the ventilation flue. This flexible protective arrangement maintains the sealing integrity of the motor while protecting the detection circuit from direct exposure to the moving air, ensuring both reliability and compositional stability.
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 enhances the motor's durability by preventing dust contamination, maintaining high efficiency, and allowing for longer maintenance cycles without reducing the motor's output, while also stabilizing rotation detection functionality.
Implementation Method 1
A ventilation fan is attached to the rotor shaft within the sealing case. The labyrinth seal part is formed between a ventilation fan's peripheral part, and a bracket. An inspiratory port is formed in the perimeter portion of the bearing of a bracket, the open air is led to a ventilation fan's center section from this inspiratory port, and it is discharged outside through the ventilation flue of a bracket.
Implementation Method 2
The motor has a detection part which rotates with the rotor, and a speed sensor which detects the detection part in order to perform rotation control and vehicle brake control.
Data Source
AI summary
In one embodiment, an electric motor. A first bracket is fixed to the first side of a stator core in an axial direction, and is fixed to first bearing housing. A second bracket is fixed to the second side of the stator core, and is fixed to second bearing housing. The rotor includes a shaft rotatably supported by bearings, and an attached rotor core. Rotor core faces the inside of the stator core. A fan is attached to the shaft between the rotor core and the first housing. A flue formed between the first housing and the first bracket is configured to draw air from a port to a part of the first bracket. A rotation detection circuit includes a detected part fixed to the fan, and is within the flue. A sensor operable to detect the part is set in the flue, counter to the detected part.