Motor Stator Slot Layout for Accurate Hot-Spot Temperature Sensing
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Solution Overview
Problem
Conventional motor stators lack suitable temperature sensor accommodation space, leading to inaccurate measurement of hot spots during operation, which affects motor control and performance.
Innovation Solution
A motor stator design featuring a ring-shaped core with enlarged temperature sensor accommodation slots that house hairpin conductors and a temperature sensor, allowing for accurate internal temperature detection by positioning the sensor between the conductors to enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional motor stator design is used, then the structure is simple and easy to manufacture, but the temperature sensor cannot accurately measure hot spots due to lack of suitable accommodation space
Solution Approach 1:
The patent applies local quality by creating a specialized temperature sensor accommodation slot with specific dimensional characteristics (greater radial length at the insertion side) that differs from conventional slots. This localized structural modification provides the optimal environment for temperature sensor placement, enabling accurate hot spot measurement without redesigning the entire stator structure.
Solution Approach 2:
The patent utilizes the radial dimension by extending the slot radially from the insertion side to the extension side, with the temperature sensor positioned at a specific radial location. This dimensional approach allows the sensor to be placed in thermal contact with the hairpin conductors while maintaining structural integrity, solving the measurement accuracy problem through spatial arrangement.
2Reliability
If a larger temperature buffer is used to protect the motor, then motor protection is improved, but operational control becomes too conservative and performance is reduced
Solution Approach 1:
The patent implements feedback by using the temperature sensor to continuously monitor the actual temperature of hairpin conductors and provide this information for operational control. This real-time feedback enables precise control strategies that protect the motor based on actual conditions rather than conservative estimates, optimizing both protection and performance.
Solution Approach 2:
The patent replaces the mechanical/conventional approach of using fixed temperature buffers with a sensor-based measurement and control system. This substitution allows for dynamic, condition-based control that adapts to actual operating conditions, eliminating the need for conservative fixed buffers and enabling optimal motor performance while maintaining reliability.
3Measurement precision
If temperature sensor is placed in conventional slots, then installation is simple, but the sensor cannot accurately detect hot spots during motor operation
Solution Approach 1:
The patent applies preliminary action by pre-configuring the temperature sensor accommodation slot with specific dimensional characteristics during stator manufacturing. The slot is designed with greater radial length at the insertion side to facilitate easy sensor insertion and positioning, while ensuring the sensor will be optimally positioned for hot spot detection during subsequent assembly operations.
Solution Approach 2:
The patent creates a localized optimal environment for temperature sensing by designing the accommodation slot with specific dimensional properties that differ from conventional slots. This localized structural feature enables accurate thermal contact between the sensor and hairpin conductors while maintaining ease of installation through the specialized slot geometry.
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
Enables precise temperature measurement of hot spots within the motor, improving operational control and performance by reducing the temperature difference between actual and measured values.
Implementation Method 1
The temperature sensor is disposed in the temperature sensor accommodation slot and between the first and second hairpin conductors
Data Source
AI summary
A motor stator includes a ring-shaped core defining a rotor accommodation space, a plurality of slots, a first hairpin conductor, a second hairpin conductor, and a temperature sensor. The slots are disposed in the core and arranged to surround the rotor accommodation space circumferentially. The slots extend radially from the rotor accommodation space. The core includes an insertion side and an extension side. The slots include a temperature sensor accommodation slot which, at the insertion side, has a radial length greater than a radial length of any other one of the slots. The first hairpin conductor is disposed in the temperature sensor accommodation slot distal to the rotor accommodation space. The second hairpin conductor is disposed in the temperature sensor accommodation slot, and the temperature sensor is disposed between the first and second hairpin conductors.