Magnetized Shaft Motor Layout for Compact, Twist-Resistant Rotors
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Solution Overview
Problem
In the downsizing of geared motors using inner rotor motors, there is a risk of the shaft becoming thin and twisted, making it difficult to assemble and maintain the motor's reliability.
Innovation Solution
The motor design incorporates a shaft with a magnetization pattern of alternately arranged N and S poles in the circumferential direction, which functions as a magnet, reducing the need for a separate magnet and allowing for a thicker shaft, thus enhancing rigidity and assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor is downsized, then the motor size is reduced, but the shaft becomes thin and is likely to be twisted
Solution Approach 1:
The invention merges the shaft and magnet into a single integrated component. The shaft itself is magnetized to form the magnet, eliminating the need for a separate magnet component. This integration allows the shaft to maintain sufficient thickness for structural strength while still achieving overall motor downsizing through the elimination of redundant components.
2Volume of moving object
If the shaft is made thinner to reduce motor size, then the motor size is reduced, but it becomes difficult to assemble
Solution Approach 1:
By integrating the magnet function into the shaft itself through magnetization, the invention reduces the total number of components that need to be assembled. The shaft serves dual purposes as both a structural support element and a magnetic component, thereby simplifying the assembly process while enabling motor downsizing.
3Reliability
If a separate magnet is used, then the magnetic function is achieved, but the shaft must be thinner and more prone to twisting
Solution Approach 1:
The invention combines the magnetic function with the shaft structure by magnetizing the shaft. This eliminates the need for a separate magnet component, allowing the shaft to maintain sufficient thickness for structural integrity and reliability while performing both mechanical support and magnetic functions simultaneously.
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 a reduction in motor size while maintaining or improving shaft rigidity, reducing the likelihood of twisting, and enhancing the motor's reliability and assembly efficiency.
Implementation Method 1
The shaft includes a magnetization pattern in which at least two or more poles of N and S poles are alternately arranged in a circumferential direction
Implementation Method 2
a stator including a coil radially opposing an outer peripheral surface of the shaft
Data Source
AI summary
A motor includes a shaft centered on a central axis that extends vertically, a bearing that supports the shaft, and a stator including a coil radially opposing an outer peripheral surface of the shaft. The shaft includes a magnetization pattern in which at least two or more poles of N and S poles are alternately arranged in a circumferential direction.