Rotor Magnet Temperature Sensing via Inductive Voltage Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnet temperature information output devices for rotating electrical machines struggle to accurately output temperature information regarding the temperature of permanent magnets as an electric signal related to voltage.
Innovation Solution
A magnet temperature information output device is provided for a rotating electrical machine, comprising a first element on the rotor with a temperature sensitive element and a first coil, and a second element on the stator with a second coil magnetically coupled to the first coil. An electric resistance element is connected to the second element, and an output section outputs an electric signal responding to the magnitude of the voltage drop in the electric resistance element, which corresponds to the temperature information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a temperature sensitive element with a first coil is used on the rotor and magnetically coupled to a second coil on the stator, then temperature information can be obtained through magnetic coupling, but the output signal is in the form of current rather than voltage, which limits the types of devices that can process the signal
Solution Approach 1:
An electric resistance element is introduced as an intermediary component between the second coil and the output section. This element converts the current signal from the magnetic coupling into a voltage signal through Ohm's law (V=IR), making the output compatible with various voltage-processing devices while adding minimal complexity to the overall circuit configuration
Solution Approach 2:
The patent changes the output parameter from current to voltage by measuring the voltage drop across the electric resistance element. This parameter transformation allows the temperature information to be output in a more versatile form that can be directly processed by standard voltage-input devices, improving adaptability without requiring complex additional circuitry
2Measurement precision
If the output section measures current flowing through the second coil, then temperature information can be obtained, but the output is limited to current signals which reduces versatility for different processing devices
Solution Approach 1:
The output parameter is changed from current to voltage by measuring the voltage drop across the electric resistance element. This maintains the precision of temperature measurement while improving versatility, as voltage signals can be processed by a wider range of devices including voltmeters, ADCs, and control systems that accept voltage inputs
3Adaptability or versatility
If an electric resistance element is added to convert current output to voltage output, then signal versatility is improved, but the device complexity increases
Solution Approach 1:
A simple electric resistance element serves as an intermediary to convert the current signal to a voltage signal. This minimal addition provides significant versatility improvement with minimal increase in device complexity, as the resistance element is a basic passive component that integrates easily into the existing circuit
Solution Approach 2:
The patent uses an electrical parameter transformation (current to voltage conversion through resistance) instead of adding complex mechanical or electronic signal conditioning circuits. This substitution achieves signal versatility improvement with minimal complexity increase by leveraging fundamental electrical principles rather than complex systems
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
The device accurately outputs temperature information regarding the temperature of the permanent magnet as an electric signal related to voltage, ensuring precise temperature monitoring and control for the rotating electrical machine.
Implementation Method 1
The temperature sensitive element, electric resistance changes in response to the temperature of the permanent magnet
Implementation Method 2
The second coil is arranged to be magnetically coupled to the first coil
Data Source
AI summary
A magnet temperature information output device includes a first element provided on a rotor, a second element provided on a stator, an electric resistance element, and an output section. The first element includes a temperature sensitive element and a first coil. In the temperature sensitive element, electric resistance changes responding to a temperature of the permanent magnet. The first coil is electrically connected to the temperature sensitive element. The second element includes a second coil. The second coil is arranged to be magnetically coupled to the first coil. The electric resistance element is electrically connected to the second element. The output section is electrically connected to the second element and the electric resistance element. The output section is arranged to output an electric signal responding to a magnitude of a voltage drop occurring in the electric resistance element as temperature information regarding the temperature of the permanent magnet.