Rotary Electric Machine Coil Gap for Temperature Sensor Positioning
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Solution Overview
Problem
Conventional rotary electric machines face issues with the dislocation of temperature measuring elements relative to coils, leading to deteriorated assembling characteristics and temperature measurement accuracy, and a decreased space factor due to the need for a space to accommodate these components.
Innovation Solution
A rotary electric machine design featuring a stator with a cylindrical shape and radially inwardly protruding teeth, where a gap is created on the coil's outer surface by skipping winding turns, allowing for easy positioning and secure placement of the temperature measuring element without additional securing parts, thereby improving assembly and measurement accuracy and space factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature measuring element is pressed against the coil by an elastic insulating member, then the temperature measuring element is brought into contact with the coil, but the temperature measuring element is easily dislocated relative to the coil, deteriorating assembling characteristic and measurement accuracy
Solution Approach 1:
The patent creates a gap in the coil winding during the winding process itself, before assembly. This preliminary action provides a pre-formed positioning structure that guides the temperature measuring element into its correct position, eliminating the need for elastic insulating members and subsequent assembly adjustments.
Solution Approach 2:
The gap in the coil winding acts as an intermediary structure that facilitates the positioning and contact between the temperature measuring element and the coil. Instead of using elastic insulating members as intermediaries, the gap itself serves as the mediating structure that ensures both contact and positional stability.
2Ease of manufacture
If a space is provided to dispose the temperature measuring element and elastic insulating member between adjacent coils, then these components can be assembled, but the number of layers of the wound coil decreases, resulting in decrease in space factor
Solution Approach 1:
The patent extracts the elastic insulating member from the assembly, eliminating the need for additional space to accommodate this component. The gap is formed directly in the coil winding structure, removing the separate insulating element and its required clearance space.
Solution Approach 2:
The patent merges the gap formation into the coil winding process itself. The gap is created as an integral part of the winding structure by controlling the wire laying pattern, rather than being a separate feature requiring additional space between components.
3Manufacturing precision
If the temperature measuring element is disposed in a gap created by skipping winding turns, then positioning is easy and assembling characteristic is improved, but additional manufacturing steps are required
Solution Approach 1:
The coil winding process itself creates the gap structure needed for temperature measuring element positioning. The winding machine or operator simply follows a modified winding pattern that skips certain turns, allowing the gap to form automatically as part of the normal winding operation without requiring separate machining or assembly steps.
Data Source
AI summary
A stator includes an iron core cylindrical part, multiple teeth, and a coil. The iron core cylindrical part has multiple circular arc-shaped core back parts. The teeth radially inwardly protrude from an inner circumferential wall surface of the iron core cylindrical part. The coil is wound around each of the teeth. A first coil and a second coil are disposed so as to hold a temperature measuring element therebetween. The first coil has an outer surface provided with a gap made of a recess or a space, which is formed by skipping winding a coil wire. The temperature measuring element for measuring temperature of the coil is inserted in the gap and is assembled.