Stator Temperature Sensor Placement Between Coil Sides
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Solution Overview
Problem
Current temperature monitoring methods in dynamoelectric machines are inadequate as they fail to accurately determine the temperature between coil sides of the winding system in stator slots, where differing voltage potentials exist, leading to potential operational failures due to insufficient cooling.
Innovation Solution
A temperature sensor is placed between the coil sides of neighboring coils in the stator slots, anchored on a mounting strip or phase separator, ensuring accurate temperature profiling without relying on end-winding or laminated-core temperature measurements, and secured through impregnation for vibration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are attached to the laminated core or end windings, then temperature monitoring is implemented, but the actual temperature between coil sides cannot be accurately determined
Solution Approach 1:
A phase separator is introduced as an intermediary component between the coil sides in the stator slots. The phase separator serves dual functions: it electrically isolates the coil sides with different voltage potentials and provides a mounting surface for the temperature sensor. This intermediary structure enables direct temperature measurement at the critical location without electrical interference or safety issues.
Solution Approach 2:
The phase separator is pre-installed in the stator slots before the coils are inserted. The temperature sensor is then mounted on the phase separator in advance, positioned exactly where it is needed for accurate temperature monitoring. This preliminary arrangement ensures that the sensor is already in place to capture temperature data from the critical region between coil sides.
2Measurement precision
If multiple temperature sensors are placed at different locations to capture temperature variations, then measurement coverage is improved, but measurement point variations cause scatter in response behavior
Solution Approach 1:
The phase separator serves multiple functions simultaneously: it acts as an electrical insulator between coil sides, provides structural support for the temperature sensor, and creates a standardized mounting location. This multi-functionality eliminates the need for separate components and simplifies the overall sensor arrangement while ensuring consistent temperature measurement points.
Solution Approach 2:
The invention places the temperature sensor at a specific, standardized location on the phase separator that corresponds to the critical thermal region between coil sides. This localized measurement approach focuses on the most important temperature point rather than attempting to measure all possible locations, reducing scatter while maintaining measurement accuracy.
3Area of stationary object
If the installation area in the slot is utilized efficiently to accommodate the temperature sensor, then space is optimized, but the sensor requires additional fixation methods
Solution Approach 1:
The phase separator and temperature sensor mounting functions are merged into a single integrated structure. The phase separator itself provides the mounting surface for the sensor, eliminating the need for separate mounting brackets or additional fixation structures. This merging optimizes slot space while simplifying the installation process.
Solution Approach 2:
The phase separator is pre-positioned in the slot with the temperature sensor already mounted on it before the coil assembly is inserted. This preliminary assembly ensures that the sensor is securely fixed in the correct position without requiring additional installation steps or complex fixation mechanisms during final assembly.
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 approach allows for direct and accurate temperature monitoring within the stator slots, minimizing measurement point variations and ensuring reliable operation by providing precise temperature data for effective cooling management.
Implementation Method 1
a temperature sensor arranged between the coil sides in at least one of the slots
Implementation Method 2
the temperature sensor is anchored and fixed in a vibration-resistant manner by the coupled securement and the adhesive bonding through impregnation
Data Source
AI summary
A stator for a dynamoelectric machine includes a stator body having slots and a winding system positioned in the slots of the stator body and having coils terminating in winding heads on end faces of the stator body, wherein each slot receives different coil sides of neighboring coils. Arranged between the coil sides in at least one of the slots is a temperature sensor to ascertain a temperature in the stator, in particular between the coil sides of the winding system in the slots of the stator.