Disturbance Avoiding Cover for Motor Magnetic Sensor
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Solution Overview
Problem
Existing technologies for detecting rotary angles in motors using magnetic sensors are vulnerable to external magnetic fields and physical disturbances, such as foreign objects and heat, which can affect detection accuracy and increase the complexity and weight of the motor system.
Innovation Solution
A disturbance avoiding cover is designed to protect the motor system from external magnetic fields, heat, and foreign matter by being positioned between the motor and potential disturbing objects, with a body inclined relative to the vertical direction and featuring lower openings for foreign matter discharge, thereby reducing interference and maintaining detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic sensor is used to detect rotary angle of a motor, then detection accuracy is improved, but the system becomes vulnerable to external magnetic fields and physical disturbances
Solution Approach 1:
A cover structure is introduced as an intermediary element between the magnetic sensor and the external environment. The cover includes a magnetic flux cancellation portion that generates opposing magnetic flux to neutralize external magnetic field interference, thereby protecting the sensor while maintaining detection accuracy
Solution Approach 2:
The patent converts the harmful effect of external magnetic fields into a beneficial shielding mechanism by using a magnetic flux cancellation portion that actively generates opposing magnetic flux. This transforms the vulnerability to magnetic interference into an active protection system that neutralizes disturbances
2Measurement precision
If lead wires are equipped centered on magnetic sensor to cancel leakage of magnetic flux, then detection accuracy is improved, but the configuration complexity increases
Solution Approach 1:
The patent combines the magnetic flux cancellation function with the cover structure itself, merging multiple functions (protection, flux cancellation, and structural support) into a single integrated component. This eliminates the need for separate lead wire arrangements and reduces overall system complexity
3Object-affected harmful factors
If a cover is added to protect from external disturbances, then protection capability is improved, but the device complexity and weight increase
Solution Approach 1:
The cover is designed to perform multiple functions simultaneously: physical protection of the magnetic sensor, magnetic flux cancellation through the specialized portion, structural support, and potential heat dissipation. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device 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 effectively shields the motor system from external disturbances, simplifies its structure, and enhances its flexibility by allowing for aeration and heat dissipation, while maintaining the accuracy of magnetic field detection.
Implementation Method 1
the cover includes a magnetic flux cancellation portion configured to cancel a magnetic flux from a magnet in a motor
Implementation Method 2
The lowermost portion has a foreign matter discharge portion
Data Source
AI summary
A body is located between a protected component and a disturbing object and is inclined relative to a vertical direction. The protected component is located outside an interior of a vehicle. The body includes a lowermost portion in the vertical direction. The lowermost portion has a foreign matter discharge portion. An upper side of the protected component in the vertical direction is at least partially exposed from the body.