Motor Coil Temperature Sensor Mounting for Accurate Positioning
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Solution Overview
Problem
The existing support member attachment method for temperature sensors in rotating electrical machines leads to deteriorated position accuracy and unstable temperature measurements due to variations in the measurement position, affecting the reliability of the temperature sensor.
Innovation Solution
A rotating electrical machine design that includes a support member with a communication portion allowing the temperature sensor to be positioned accurately using a positioning jig, ensuring it is not in contact with the stator core, and utilizing a distributed square wire coil configuration to stabilize the sensor's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the support member is attached in consideration of fixing the housing, then the fixability to housing is improved, but the position accuracy of the temperature sensor on the coil side deteriorates
Solution Approach 1:
A positioning jig is introduced as an intermediary tool during the assembly process. The positioning jig temporarily holds the temperature sensor at the correct position relative to the coil, allowing accurate positioning without requiring the support member's attachment structure to be optimized for both housing fixation and sensor positioning simultaneously. After positioning, the support member is attached to the housing, and the positioning jig is removed.
2Stability of the object's composition
If the support member is fixed to the housing, then the stability of attachment is improved, but the temperature measurement stability deteriorates due to variations in measurement position
Solution Approach 1:
The temperature sensor is positioned at the correct location relative to the coil using the positioning jig before the support member is permanently attached to the housing. This preliminary positioning action ensures that once the support member is fixed to the housing for stability, the sensor maintains its accurate position relative to the coil, thereby ensuring stable temperature measurements.
3Reliability
If the temperature sensor is positioned away from the stator core, then the reliability of temperature sensor is improved, but the positioning complexity increases
Solution Approach 1:
The positioning jig is designed to be self-aligning with the coil structure. The jig automatically positions itself relative to the coil through simple geometric features such as slots or protrusions that match corresponding features on the coil, eliminating the need for complex alignment procedures or additional positioning mechanisms.
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 design enhances the reliability of the temperature sensor by ensuring accurate positioning and stable temperature detection, maintaining fixability without compromising the sensor's attachment to the housing.
Implementation Method 1
a spring portion (18b) that extends from the fastening portion (18a) and is an elastic body
Data Source
AI summary
A rotating electrical machine includes a coil wound in a distributed square wire manner, a stator core forming a slot that stores the coil, a temperature sensor that detects a temperature of the coil, and a housing that houses the stator core. The temperature sensor includes a support member that supports the temperature sensor by being connected and fixed to the housing, and the support member includes a communication portion communicating with a coil space formed by the stator core and adjacent coils among coils housed in slots.