Outer-Rotor In-Wheel Motor Sensor Phase Positioning
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Solution Overview
Problem
In-wheel motors with outer rotor types face difficulties in reattaching the rotating member with a sensor, making it challenging to perform phase matching between the sensor and magnet after detachment and reattachment.
Innovation Solution
An in-wheel motor design that includes an attachable/detachable member with a sensor on its surface facing the stator's inner circumferential surface and a positioning part to define the positional relationship between the sensor and magnet, ensuring a set phase difference when the member is reattached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the rotating member is made detachable from the rotor for maintenance or replacement, then the ease of repair is improved, but the phase matching between the sensor and magnet becomes difficult to perform
Solution Approach 1:
The patent applies preliminary action by pre-configuring the positioning part (positioning protrusion and positioning groove) on the rotating member and rotor respectively. These positioning structures are prepared in advance during manufacturing, so that when the rotating member is detached and reattached, the phase relationship between the sensor and magnet is automatically restored without requiring complex phase matching procedures. This resolves the contradiction by making the repair process easy while maintaining precise phase alignment.
2Measurement precision
If the rotating member is securely fixed to the rotor to maintain precise phase matching, then the measurement precision is improved, but the ease of repair deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the rotor assembly into separable components: the rotor and the rotating member (which includes the sensor). The positioning part is divided into a positioning protrusion on one component and a corresponding positioning groove on the other. This segmentation allows the rotating member to be detached for repair while ensuring precise reattachment through the positioning structures, thus maintaining measurement precision while improving ease of repair.
Data Source
AI summary
Provided is an in-wheel motor with which phase matching of a sensor and a magnet can be easily carried out. This in-wheel motor is an outer rotor-type in-wheel motor comprising a stator and a rotor. The in-wheel motor comprises: a sensor that senses the rotation state of the rotor; an attachable/detachable member that can be attached to and detached from the rotor, and that has a surface which opposes the inner circumferential surface of the stator and on which the sensor is provided; and a positioning part that, when the attachable/detachable member has been attached to the rotor, defines a positional relationship between the sensor and a magnet of the rotor so that a phase difference between the sensor and the magnet reaches a set value.