Motor Yoke with Segmented Magnets for High-Speed Detection
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Solution Overview
Problem
Existing motors face limitations in maintaining a high constant speed condition, particularly when used with sensor devices like LiDAR, as they rely on detecting magnetic flux changes which are insufficient for high-speed requirements.
Innovation Solution
The motor design incorporates a yoke with strategically positioned first and second magnets and Hall sensors, along with a unique flange structure and connection members, to enhance the detection of rotor position and maintain constant speed through precise magnetic flux sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a general drive magnet is used with a Hall sensor to detect rotor position, then the motor structure is simple, but the constant speed driving condition cannot be satisfied under high speed requirements
Solution Approach 1:
The drive magnet is divided into two separate magnets: a first magnet for generating drive force and a second magnet for position detection. This segmentation allows each magnet to be optimized for its specific function, with the second magnet strategically positioned to enhance magnetic flux change detection precision for high-speed constant speed control
Solution Approach 2:
A yoke with specifically designed grooves (first groove and second groove) is introduced as an intermediary structure to concentrate and guide magnetic flux from the second magnet to the Hall sensor. This intermediary structure enhances the magnetic flux detection precision without requiring a more complex sensor system
2Measurement precision
If the second magnet is disposed in the first groove of the flange, then the magnetic flux detection precision is improved, but the device complexity increases
Solution Approach 1:
The flange structure is designed with multi-functionality: it provides structural support, contains grooves for magnet positioning, and acts as a magnetic flux guide. The first groove holds the second magnet while the second groove guides magnetic flux to the Hall sensor, combining multiple functions into a single component to minimize overall device complexity
Solution Approach 2:
The yoke body and flange are merged into a single integrated component rather than separate parts. This merging reduces assembly complexity while maintaining the functional benefits of the groove structure for magnet positioning and magnetic flux guidance
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 allows for precise detection of motor speed, ensuring high constant speed driving conditions are met, improving the performance and reliability of motor-driven sensor devices.
Implementation Method 1
the motor may include a Hall sensor configured to detect a change in magnetic flux of a drive magnet disposed on the rotor
Implementation Method 2
The rotor rotates due to an electromagnetic interaction between the rotor and the stator
Data Source
AI summary
The present invention can provide a motor including a shaft, a yoke coupled to the shaft, a stator disposed between the shaft and the yoke, a first magnet and a second magnet which are disposed on the yoke, and a circuit board on which a first Hall sensor disposed to correspond to the first magnet and a second Hall sensor disposed to correspond to the second magnet are disposed, wherein the yoke includes a body and a flange extending from the body, the flange includes a first groove, the first magnet is disposed on an inner circumferential surface of the body, the second magnet is disposed in the first groove, and a second groove having an open portion in a direction opposite to the first groove is disposed between the body and the flange.