Locomotive Traction Motor Speed Sensor Modular Mounting
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Solution Overview
Problem
Conventional traction motor speed sensor designs require the entire assembly to be replaced when the sensor fails, leading to high labor, time, and cost due to their harsh environment and integral sensor configuration, necessitating frequent replacements.
Innovation Solution
A modular speed sensor system with a replaceable sensor assembly and a mounting bracket that allows for precise alignment and positioning without adjustment, using a tubular sensor shell and pin configuration for easy replacement within a stainless steel mounting bracket, ensuring proper alignment and secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor is integral to the assembly, then the mounting structure is simplified, but the entire assembly must be replaced when the sensor fails, increasing labor and cost
Solution Approach 1:
The speed sensor assembly is divided into two separable components: a mounting bracket that remains fixed and a sensor assembly that can be independently removed and replaced. This segmentation allows the sensor to be replaced without replacing the entire mounting structure, reducing labor and cost while maintaining structural simplicity.
2Ease of repair
If the sensor assembly is made removable, then replacement becomes easier, but precise alignment and positioning become more difficult
Solution Approach 1:
The sensor assembly is designed with self-aligning features including a flattened mating surface on the sensor shell and a corresponding pin in the mounting bracket. When the sensor assembly is inserted, the pin automatically aligns with the flattened surface, ensuring precise positioning without requiring manual adjustment or complex alignment procedures.
3Reliability
If the sensor requires regular replacement due to harsh environment, then reliability is maintained, but labor and time costs increase
Solution Approach 1:
By separating the sensor assembly from the mounting bracket, the replacement process is simplified to only involve removing and installing the sensor assembly itself. This eliminates the need to disassemble and reassemble the entire mounting structure, significantly reducing replacement time and labor costs while maintaining the ability to replace sensors regularly in the harsh locomotive environment.
Data Source
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Figure 3A~3C
AI summary
A speed sensor system for a locomotive traction motor of the type having a motor frame head adjacent each wheel truck, including a mounting bracket, attachable to the frame head at a prescribed distance from an axis of rotation of the motor and a sensor support portion extending from the inner surface through the ventilation opening and having a hollow tubular portion at the end for releasably receiving and positioning a separate sensor assembly in such a manner that the sensor itself is precisely positioned with respect to the armature gear surface of the traction motor.