Outer Rotor Attachment Structure for Centrifugal Load Reliability
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Solution Overview
Problem
The existing outer rotor type motor design suffers from reduced strength reliability due to centrifugal force acting on the flange portion near the motor shaft, which is integral to the rotor main body.
Innovation Solution
The motor design includes a rotor attachment member with an outer end positioned close to the inner circumferential surface of the rotor yoke, rather than the outer peripheral surface of the motor shaft, distributing the centrifugal force more effectively and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotor is attached to the flange portion formed near the motor shaft, then the structure is simplified, but the strength reliability deteriorates due to centrifugal force acting on the flange portion
Solution Approach 1:
The invention divides the attachment structure into two separate components: a flange portion for mounting and a rotor attachment member for securing the rotor. This segmentation allows the flange to be positioned near the motor shaft for simplified mounting while the rotor attachment member extends outward to position the rotor optimally, reducing centrifugal force impact on the flange portion and thereby improving strength reliability without increasing overall structural complexity
Solution Approach 2:
The rotor attachment member acts as an intermediary component between the flange portion and the rotor. It transfers the mechanical connection from the flange to the rotor while positioning the rotor at an optimal distance from the motor shaft, thereby reducing the centrifugal force load on the flange portion and improving strength reliability without complicating the overall structure
2Reliability
If the rotor attachment member outer end is positioned close to the inner circumferential surface of the rotor yoke, then the strength reliability improves by reducing centrifugal force impact, but the manufacturing precision requirements increase
Solution Approach 1:
The rotor attachment member is designed with pre-formed engagement structures including protrusions and recesses that enable preliminary positioning and alignment during assembly. This preliminary action ensures that the outer end is positioned close to the inner circumferential surface of the rotor yoke with appropriate precision, reducing centrifugal force impact while managing manufacturing precision requirements through built-in alignment features
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 reduces the impact of centrifugal force on the motor shaft, improving the strength reliability and durability of the outer rotor type motor.
Implementation Method 1
the centrifugal force (load) that can be generated by the rotation of a rotor
Data Source
AI summary
An outer rotor type motor includes a rotor in which magnets are arranged on an inner circumferential surface of a cylindrical rotor yoke. The outer rotor type motor comprises: a motor shaft configured to rotatably support the rotor; and a rotor attachment member including a base end extended from an outer periphery of the motor shaft outward in a radial direction and an outer end formed from an outer periphery of the base end outward in the radial direction, wherein the outer end is formed at a position close to the inner circumferential surface of the rotor yoke, as compared with an outer peripheral surface of the motor shaft, and the rotor is attached to the outer end.