Motor Unit Capacitor Layout for Compact Thermal Protection
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Solution Overview
Problem
Existing motor units face challenges in reducing their size due to the arrangement of capacitors, which occupy significant space and can lead to increased dimensions.
Innovation Solution
The motor unit is configured with a first rotating body, a second rotating body, and a third rotating body, where the drive circuit, including a capacitor, is positioned adjacent to the second and third rotating bodies, effectively utilizing dead spaces to minimize the unit's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor is arranged in a conventional motor unit configuration, then the motor unit can be assembled with standard components, but the overall size of the motor unit increases due to the capacitor occupying significant space
Solution Approach 1:
The capacitor is nested within the dead space formed by the rotating bodies, specifically positioned in the space between the second rotating body and the housing, and between the third rotating body and the housing. This nesting approach allows the capacitor to occupy otherwise wasted space, thereby reducing the overall motor unit volume without increasing device complexity
Solution Approach 2:
The capacitor is arranged in a direction perpendicular to the rotation axis of the first rotating body, utilizing the radial dead space between the rotating bodies and the housing. This dimensional repositioning allows efficient space utilization in the radial direction, minimizing the motor unit's overall footprint
2Volume of moving object
If the capacitor is positioned close to rotating bodies to reduce size, then the footprint is minimized, but heat transfer to the capacitor increases causing potential heat damage
Solution Approach 1:
A heat insulating member is introduced as an intermediary between the rotating bodies and the capacitor. This mediator reduces heat transfer from the rotating bodies to the capacitor while allowing the capacitor to be positioned in the dead space close to the rotating bodies, thus maintaining compact footprint while preventing heat damage
Solution Approach 2:
The dead space that would otherwise be wasted is converted into a beneficial positioning location for the capacitor. By strategically placing the capacitor in the dead space between the rotating bodies and housing, the previously harmful proximity to rotating bodies is transformed into an opportunity for compact arrangement, with heat insulation providing the necessary protection
Data Source
AI summary
A motor unit includes a first rotating body, a second rotating body, a third rotating body, and a drive circuit. The second rotating body is arranged in line with the first rotating body in a rotation axis direction of the first rotating body and rotates together with the first rotating body. The third rotating body is arranged in line with the first rotating body in an alignment direction different from the rotation axis direction and rotates together with the first rotating body. The drive circuit includes a capacitor and drives and rotates at least one of the first rotating body, the second rotating body, and the third rotating body. The capacitor is arranged adjacent to the second rotating body. The capacitor is also arranged adjacent to the third rotating body.