Motor Sensor Magnet Bushing Embedding
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Solution Overview
Problem
In conventional motors, the sensor magnet integrated with the bushing can separate from the bushing, leading to potential failures in rotation detection.
Innovation Solution
The motor design incorporates an annular sensor magnet rotated with the rotor shaft, where the bushing includes an annular fixing portion and extensions that are embedded in the sensor magnet, providing axial and circumferential engagement to prevent separation and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensor magnet is injection molded integrally with the bushing, then the structure is simplified and manufacturing is easier, but the sensor magnet may become separated from the bushing
Solution Approach 1:
The bushing is divided into a fixing portion and an extension portion, where the extension protrudes into the sensor magnet to create mechanical interlocking. This segmentation allows the sensor magnet and bushing to remain separate components while achieving strong attachment, resolving the contradiction between ease of manufacture and attachment reliability.
Solution Approach 2:
The extension of the bushing is embedded within the sensor magnet, creating a nested structure where one component is partially contained within the other. This nesting provides both axial and circumferential engagement, ensuring the sensor magnet remains securely attached while simplifying the overall assembly process.
2Reliability
If the sensor magnet is securely attached to the bushing, then separation is prevented, but the structural complexity of the bushing increases
Solution Approach 1:
The bushing is segmented into functional portions: a fixing portion that attaches to the rotor shaft and an extension portion that engages the sensor magnet. This segmentation achieves secure attachment while maintaining a relatively simple overall structure, as each portion has a specific function that can be optimized independently.
Solution Approach 2:
The extension protrudes from the bushing in the axial direction, adding a dimensional element that provides both axial and circumferential engagement with the sensor magnet. This dimensional addition secures the sensor magnet without requiring complex multi-faceted structures.
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
This configuration effectively prevents sensor magnet separation, improves strength, and maintains magnetic flux integrity by ensuring the sensor magnet remains securely attached to the bushing, even under axial and radial stresses, thus enhancing the motor's reliability and accuracy in rotation detection.
Implementation Method 1
The extension includes an axial engagement portion engaged with the sensor magnet in the axial direction inside the sensor magnet
Implementation Method 2
a rotation detector arranged opposed to the sensor magnet to detect rotation information of the rotor
Data Source
AI summary
A motor includes an annular sensor magnet rotated integrally with a rotation shaft of a rotor by a bushing, and a rotation detector arranged opposed to the sensor magnet to detect rotation information of the rotor. The bushing includes an annular fixing portion, which is fixed to the rotation shaft, and an extension, which extends from the fixing portion in an axial direction of the rotation shaft and is embedded in the sensor magnet. The extension includes an axial engagement portion engaged with the sensor magnet in the axial direction inside the sensor magnet.