Magnetostriction Torque Sensor Switching Element Failure Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetostriction type torque sensors fail to distinguish between normal and failure states of a switching element, as the intermediate potential at the connection point between detection coils remains the same in both conditions, making it difficult to differentiate between normal and ON-failure states.
Innovation Solution
A magnetostriction type torque sensor that includes magnetic property change material on a shaft, an excitation signal generator, multiple detection coils, and an operational state monitor to detect changes in magnetic properties and monitor the operational state of switching elements, preventing excessive current and disconnection by determining if the monitoring signal is at earth or power supply potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excitation voltage is applied to detection coils through a switching element, then torque detection is enabled, but the ability to distinguish normal state from ON-failure state is lost
Solution Approach 1:
A monitoring signal is introduced as an intermediary to detect the operational state of the switching element. The monitoring signal is output from the operational state monitor based on the excitation signal and monitoring voltage, enabling distinction between normal and failure states without affecting the primary torque detection function.
Solution Approach 2:
The operational state monitor provides feedback about the switching element's condition by monitoring the monitoring signal. This feedback mechanism allows the system to detect ON-failure states and distinguish them from normal operation, resolving the information loss problem.
2Use of energy by moving object
If pulse excitation voltage is applied to limit increasing current, then current control is improved, but switching element failure detection capability deteriorates
Solution Approach 1:
The monitoring signal is generated in advance during the pulse excitation process, allowing failure detection without interfering with the current control function. The operational state monitor continuously monitors the switching element state throughout the pulse excitation cycle.
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 differentiates between normal and failure states of the switching element, preventing excessive current and disconnection, thereby ensuring accurate torque detection and sensor operation.
Implementation Method 1
magnetic property change material which is provided on a shaft and whose magnetic property changes in accordance with torque applied to the shaft
Implementation Method 2
the change in the impedance property of the detection coil is detected
Data Source
AI summary
A magnetostriction type torque sensor is provided which includes magnetic property change material which is provided on a shaft and whose magnetic property changes in accordance with torque applied to the shaft, an excitation signal generator which generates an excitation signal whose voltage is converted into a predetermined voltage through a switching element, a plurality of detection coils to which the excitation signal generator applies the excitation signal, and which plurality of detection coils outputs voltage, which changes in accordance with change in the magnetic property of the magnetic property change material, between connection points between the detection coils, and an operational state monitor which monitors an operational state of the switching element.