Rail Motor Speed Sensor Layout for Heat-Protected Compact Mounting
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Solution Overview
Problem
Existing electric motors for rail vehicles face challenges in arranging components for regulating the motor in a space-saving manner, particularly due to heat generation and limited installation space, while also needing protection from environmental impacts.
Innovation Solution
The rotational speed sensor is mounted on the end shield of the electric motor, with the sensor wheel integrated into the coupling, allowing for space-efficient placement and protection from heat and external impacts, and utilizing threaded blind holes for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotational speed sensor is mounted inside the motor housing, then the installation space is utilized efficiently, but the sensor is exposed to high heat and potential damage from stone impact
Solution Approach 1:
The rotational speed sensor is extracted from the motor housing interior and mounted on the exterior surface of the end shield. This separation removes the sensor from the harmful thermal environment and mechanical damage risks while maintaining compact overall dimensions through external mounting on the existing housing structure.
2Volume of moving object
If the sensor wheel is integrated into the coupling, then additional installation space in the axial direction is eliminated, but the coupling structure becomes more complex
Solution Approach 1:
The sensor wheel is merged with the coupling component, forming an integrated assembly. The sensor wheel is mounted on the coupling hub or flange, allowing the coupling to serve dual functions: power transmission and sensor wheel support. This eliminates the need for separate mounting structures and reduces axial space requirements.
3Reliability
If multiple rotational speed sensors are mounted on the end shield, then measurement redundancy and reliability are improved, but the mounting structure becomes more complex
Solution Approach 1:
The end shield is designed as a universal mounting platform that can accommodate one or multiple rotational speed sensors. Standardized mounting features (such as threaded holes or flange interfaces) are provided on the end shield surface, allowing flexible configuration of sensor quantity and arrangement without requiring different mounting structures for different sensor counts.
Data Source
AI summary
An electric motor for a rail vehicle has a rotational speed sensor. The rotational speed sensor is mounted to an end shield of the electric motor. A sensor wheel for the rotational speed sensor is mounted to a clutch of the electric motor.