Motor Rotation Detection Device Non-Contact Magnetic Coupling
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Solution Overview
Problem
Existing motor rotation detection devices require complex structures and multiple components to couple a sensor magnet to a rotating shaft, making them costly and prone to separation.
Innovation Solution
A motor rotation detection device featuring a spacer and sensor magnet coupled to a rotating shaft through a non-magnetic case, allowing for a lightweight, cost-effective, and rigid coupling structure that transmits rotation position via magnetic flux in a non-contact manner, with the option of using elastic materials and enlarged sensor magnet sizes for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coupling structure is used to attach the sensor magnet to the rotating shaft, then the sensor magnet can be fixed, but the structure becomes complicated and requires multiple components
Solution Approach 1:
The case integrates multiple functions into a single component: it holds the sensor magnet, provides the magnetic pole, and couples to the rotating shaft. This merging eliminates the need for separate coupling components while maintaining reliable fixation, directly resolving the contradiction between reliability and structural complexity
Solution Approach 2:
The case serves multiple purposes simultaneously: it acts as a mounting structure for the sensor magnet, provides the magnetic pole for detection, and functions as the coupling element to the rotating shaft. This multi-functionality reduces the number of components needed while ensuring reliable attachment
2Reliability
If multiple components are used in the coupling structure, then the sensor magnet can be fixed, but the overall weight and cost increase
Solution Approach 1:
By combining the mounting structure, magnetic pole, and coupling element into a single case component, the total weight is reduced compared to using multiple separate components. The integrated design maintains coupling reliability while minimizing the weight of the moving detection device
Solution Approach 2:
The invention extracts and eliminates unnecessary intermediate components from the coupling structure. By using the case itself as the coupling element rather than adding separate coupling components, weight is reduced while maintaining reliable attachment to the rotating shaft
3Measurement precision
If the sensor magnet size is increased to improve detection performance, then detection accuracy improves, but the coupling structure becomes more complex
Solution Approach 1:
The case is designed to accommodate larger sensor magnets by integrating the mounting function directly into the case structure. This allows enlarged magnet sizes for improved detection accuracy without requiring additional coupling components or complex mounting mechanisms
Solution Approach 2:
The case's multi-functional design allows it to adapt to different sensor magnet sizes while maintaining the same coupling structure. The integrated case provides both magnetic pole function and mounting capability, enabling larger magnets for better precision without increasing structural complexity
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 solution enables a lightweight, cost-effective motor rotation detection device with enhanced resistance to separation and improved accuracy in detecting motor rotation positions, achieved through a simple and robust coupling structure that minimizes material costs and maximizes magnetic flux transmission.
Implementation Method 1
a sensor magnet which is disposed on the other end of the spacer and generates magnetic flux
Data Source
AI summary
A motor rotation detection device is disclosed. The motor rotation detection device according to one embodiment of the present invention, which is coupled to a rotating shaft of a motor to transmit a rotation position of a motor to a motor position sensor (MPS) through magnetic flux in a non-contact manner, includes: a spacer that is disposed so that one end thereof is in contact with one end of the rotating shaft; a sensor magnet that is disposed on the other end of the spacer and generates magnetic flux; and a case that is coupled to the rotating shaft and provides a fixing force to fix the sensor magnet and the spacer to the rotating shaft.