Motor Temperature Sensor Fixture with Engagement Portion
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Solution Overview
Problem
Existing methods for securing temperature detection elements to motor windings are either inaccurate, require significant manual effort, or are difficult to adjust, leading to potential electrical shorts and inefficiencies in temperature measurement.
Innovation Solution
A fixture with a recess to house the temperature detection element and an engagement portion that secures it to the winding, allowing for easy and precise positioning and adjustment, featuring a hole for the lead wire and a plate-like member for enhanced contact, designed to minimize deformation risks in resin-molded motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to secure the temperature detection element to the winding, then the temperature detection element can be fixed to the winding, but the positioning accuracy is poor and the element may be displaced before the adhesive hardens
Solution Approach 1:
A fixture is introduced as an intermediary component between the temperature detection element and the winding. The fixture includes a main body with a recess that houses the temperature detection element, and an engagement portion that mechanically engages with the winding rim. This intermediary structure provides both secure fixation and precise positioning, eliminating the displacement problem associated with adhesive alone.
2Reliability
If a string is used to secure the temperature detection element, then the element can be fixed to the winding, but significant manual effort and time are required
Solution Approach 1:
The fixture is designed to be self-securing through its engagement portion that mechanically interfaces with the winding rim. Once the fixture is positioned, the engagement portion automatically locks onto the winding structure without requiring continuous manual manipulation or tying operations, significantly reducing the time and effort needed compared to string-based methods.
3Reliability
If the temperature detection element is secured using conventional methods, then the element can be fixed, but adjustment and repositioning are difficult or impossible
Solution Approach 1:
The securing system is divided into separable components: the fixture and the temperature detection element. The fixture itself is separable from the winding through its engagement portion design. This segmentation allows the temperature detection element to be easily removed and repositioned by simply detaching and reattaching the fixture, providing flexibility for adjustment and repair that was not possible with conventional adhesive or string methods.
4Reliability
If the temperature sensitive part is housed deeply in the fixture, then the element is securely fixed, but contact with the winding inner surface is insufficient
Solution Approach 1:
The fixture's recess is designed with specific dimensional characteristics - the depth is controlled to be less than the maximum thickness of the temperature sensitive part. This creates a local quality condition where the temperature sensitive part protrudes slightly from the fixture's outer surface, ensuring adequate contact with the winding inner surface for accurate temperature detection while maintaining secure fixation through the fixture's engagement portion.
Data Source
AI summary
A fixture which secures a temperature detection element to a winding provided around a stator core of a motor, includes a main body to be inserted into a gap between the stator core and the winding, and an engagement portion formed on one end side of the main body on one side of the main body to engage with the rim of the opening of the winding. On the one side of the main body a recess is formed to house a temperature sensitive part of the temperature detection element. The depth of the recess is less than the maximum thickness of the temperature sensitive part of the temperature detection element.