Shaft-Mounted Sensor Layout for Rotating Machine State Estimation
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Solution Overview
Problem
Existing rotating electric machines face challenges in accurately estimating the internal distribution state due to difficulties in attaching sensors to hollow shafts, which affects shaft strength and measurement accuracy.
Innovation Solution
A rotating electric machine system that includes a stator, a rotor, a solid shaft, a bracket for supporting the shaft, and a sensor attached to the shaft between the rotor and the bearing. The system uses a control unit to estimate the internal state based on a thermal network model and temperature information from the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is provided in a hollow of a hollow shaft, then the sensor can be attached to the shaft, but the attachment is not easy and estimation accuracy for the internal distribution state is lowered
Solution Approach 1:
Instead of placing the sensor inside the hollow shaft as in conventional designs, the patent inverts the approach by providing the sensor on the outer surface of the shaft. This inversion resolves the contradiction by making sensor attachment straightforward while maintaining high estimation accuracy through the use of a hollow shaft structure that allows thermal network modeling.
2Measurement precision
If a sensor is provided in a hollow of a hollow shaft, then the sensor can be attached to the shaft, but the configuration becomes complex
Solution Approach 1:
The patent simplifies the overall configuration by inverting the sensor placement from inside the hollow shaft to the outer surface. This eliminates the complexity of internal sensor mounting structures while maintaining the hollow shaft design for thermal modeling purposes, thus achieving high measurement precision with a simpler configuration.
3Measurement precision
If a sensor is provided in a hollow of a hollow shaft, then the sensor can be attached to the shaft, but attachment thereof is not easy
Solution Approach 1:
By inverting the sensor placement from the interior hollow space to the exterior surface of the shaft, the patent makes sensor attachment straightforward and easy to operate. The sensor can be easily mounted on the outer surface while the hollow shaft structure remains intact for thermal network analysis, thus achieving both high measurement accuracy and ease of operation.
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 improves the estimation accuracy of the internal distribution state with a simple setup, maintains shaft strength, and allows for accurate temperature measurement, enhancing the control and operation range of the rotating electric machine.
Implementation Method 1
temperature information of the shaft between the rotor and the bearing acquired by the sensor
Data Source
AI summary
An object is to improve estimation accuracy of the internal distribution state of a rotating electric machine. The rotating electric machine includes a stator; a rotor rotatably provided on a radially inner side of the stator; a shaft provided as a rotary shaft of the rotor; a bracket supporting the shaft rotatably relative to the stator via a bearing; and a sensor provided to the shaft between the rotor and the bearing.