Rotor Temperature Detection via Wireless Iron Loss Estimation
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Solution Overview
Problem
Conventional temperature detection devices protect motor windings from overheating but fail to effectively monitor and prevent rotor overheating, especially in high-speed synchronous motors, where the rotor temperature can exceed stator temperature, leading to heat conduction issues and demagnetization of permanent magnets.
Innovation Solution
A temperature detection device that includes a current detection unit to estimate iron loss and rotor temperature using the current value, with a rotor temperature estimation unit calculating the rotor temperature based on iron loss and winding temperature, and an alarm generation unit to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detector (thermistor or thermostat) is used to detect winding temperature, then the winding temperature can be detected, but the rotor temperature cannot be detected because wired communication is required
Solution Approach 1:
The patent replaces the wired mechanical communication system of traditional temperature detectors with a wireless communication system. The temperature detector in the rotor communicates temperature data wirelessly to the control device, eliminating the need for physical wiring through the rotor and enabling practical rotor temperature detection.
Solution Approach 2:
The patent introduces a wireless communication intermediary system consisting of a transmission unit in the rotor and a reception unit in the control device. This intermediary enables temperature data transfer without direct physical connection, solving the contradiction between detection capability and system complexity.
2Productivity
If the rotor rotates at high speed, then the motor productivity increases, but the rotor temperature becomes remarkably higher than the stator temperature causing harmful effects
Solution Approach 1:
The patent implements preliminary temperature monitoring and warning by detecting rotor temperature and comparing it with predetermined thresholds. Before harmful effects occur, the system generates warning signals to allow preventive action, such as reducing load or speed, thereby preventing heat conduction to the stator and demagnetization of permanent magnets.
Solution Approach 2:
The patent establishes a feedback loop where the temperature detector continuously monitors rotor temperature, transmits data wirelessly to the control device, and triggers warning signals when thresholds are exceeded. This real-time feedback enables dynamic adjustment of motor operation to prevent harmful thermal effects while maintaining high-speed 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
Effectively detects and prevents rotor overheating by accurately estimating rotor temperature through iron loss calculation, reducing the risk of heat conduction and demagnetization, and providing timely alarms to protect the motor.
Implementation Method 1
a temperature detector configured to detect the temperature of the rotor using a detection element
Data Source
AI summary
A temperature detection device that detects a temperature of a rotor of a motor. The temperature detection device has a current detection unit configured to detect a current value of a current flowing through a winding with which any one of a stator and the rotor of the motor is provided, an iron loss estimation unit configured to estimate an iron loss of the rotor using the current value, and a rotor temperature estimation unit configured to estimate the temperature of the rotor using the iron loss.