Motor Stator Coil Layout for Accurate Temperature Sensing
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Solution Overview
Problem
There is a need to improve the integrity of temperature sensing in dynamo-electric machines and to effectively manage heat generation issues within these machines.
Innovation Solution
The dynamo-electric machine incorporates a tubular stator with a stator core having protruding portions, insulators, and coils. A temperature sensor is strategically placed between the bent portions of adjacent coils on the end cover side, and a circuit substrate is integrated to control the machine's operation. The gaps between components are filled with resin for enhanced thermal conductivity and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is embedded in a coil formed by winding a winding wire around a stator core, then temperature detection capability is improved, but the integrity and reliability of temperature sensing deteriorates due to heat generation problems
Solution Approach 1:
The temperature sensor is extracted from the coil structure and relocated to the end cover. This separation removes the sensor from the high-heat generation zone of the coil, preventing thermal damage to the sensor while still enabling temperature monitoring of the motor through thermal conduction paths.
Solution Approach 2:
The end cover acts as an intermediary structure that houses the temperature sensor and provides a thermal conduction path from the stator/coil assembly to the sensor. The resin filling the gap between stator and case also serves as a thermal mediator, transmitting heat from the internal components to the sensor located in the end cover.
2Stability of the object's composition
If resin is injected into the motor case to fill gaps between stator and case, then structural integrity is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The resin serves as a dual-function intermediary: structurally, it bonds the stator to the case providing mechanical stability; thermally, it acts as a conduction path transmitting heat from the stator to the case and ultimately to the temperature sensor in the end cover, enabling heat dissipation monitoring.
Solution Approach 2:
The resin is designed to perform multiple functions simultaneously: mechanical bonding/structural support, thermal conduction for heat dissipation, and thermal coupling for temperature sensing. This multi-functionality resolves the contradiction between structural integrity and heat dissipation capability.
3Measurement precision
If the temperature sensor is disposed on the end cover side of the stator between bent portions of winding wires, then heat generation monitoring is improved, but device complexity increases
Solution Approach 1:
The temperature sensor housing is merged with the end cover structure, eliminating the need for a separate sensor housing. The sensor is integrated into the existing end cover geometry, simplifying assembly while maintaining optimal positioning for heat generation monitoring between the bent portions of adjacent coils.
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 accurate temperature detection at the most critical heat-generating areas, enabling optimal operation and effectively suppressing heat-related issues in the dynamo-electric machine.
Implementation Method 1
gaps between the case and the insulator and between the plurality of protruding portions in the stator core may be filled with a resin, and the case, the stator and the temperature sensor may be integrated
Data Source
AI summary
A dynamo-electric machine in one embodiment of the present invention includes a tubular stator, a rotor disposed in an internal space of the stator, a bottomed tubular case that accommodates the stator, an end cover mounted on an open end of the case on one side, and a temperature sensor. The stator includes a stator core having a plurality of protruding portions that protrude toward a center of the stator, insulators mounted on the stator core, and a coil obtained by winding a winding wire around each of the plurality of protruding portions with the insulators therebetween. The temperature sensor is disposed on the end cover side of the stator between bent portions of the winding wires in the adjacent coils.