Outer-Rotor In-Wheel Motor Sensor Mounting Against Magnetic Flux Interference
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Solution Overview
Problem
In-wheel motors of the outer rotor type with sensors for detecting the rotational state of the rotor are prone to malfunction due to the influence of magnetic flux from the stator's coil.
Innovation Solution
An in-wheel motor design that includes a detachable hub with a sensor on its surface facing the stator's inner circumferential surface, which helps maintain a defined clearance between the sensor and the coil, reducing interference and enhancing sensor accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is provided directly on the rotor, then the sensor can detect the rotational state of the rotor, but the sensor may malfunction due to the influence of magnetic flux from the stator coil
Solution Approach 1:
The attachable/detachable member serves as an intermediary component between the sensor and the rotor. It provides a physical barrier that shields the sensor from the magnetic flux generated by the stator coil, while still allowing the sensor to detect the rotor's rotational state through the member's surface.
Solution Approach 2:
The sensor system is segmented into separate components: the sensor is mounted on the attachable/detachable member, which is then attached to the rotor. This segmentation allows the sensor to be positioned at an optimal distance from the magnetic flux source while maintaining functional connection to the rotor.
2Object-affected harmful factors
If the sensor is mounted on the attachable/detachable member facing the stator, then magnetic flux interference is reduced, but the device complexity increases
Solution Approach 1:
The attachable/detachable member serves multiple functions: it provides mechanical attachment between the sensor and rotor, acts as a magnetic flux shield, and maintains proper positioning of the sensor relative to the stator. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The attachable/detachable member can be easily removed and reattached, allowing for simple maintenance, sensor replacement, or adjustment without requiring complex disassembly procedures. This design facilitates easy recovery and reassembly of the sensor system.
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 design effectively suppresses sensor malfunctions, ensuring accurate detection of the rotor's rotational state and maintaining operational reliability.
Implementation Method 1
a sensor which detects a rotational state of the rotor
Data Source
AI summary
Provided is an in-wheel motor that can suppress an occurrence of a sensor malfunction. The in-wheel motor is of the outer rotor type comprising a stator and a rotor, and includes a sensor that detects the rotational state of the rotor and a detachable member which can be attached to and detached from the rotor and which is provided with the sensor on the surface that faces the inner circumferential surface of the stator.