Wearable Motor Hall Sensor Checking for Reliable Assist Force
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Solution Overview
Problem
Existing technologies do not effectively determine the state of motors, particularly in wearable devices, which are crucial for assisting individuals with reduced muscular strength or joint problems, leading to inefficiencies in providing assistance or resistance forces.
Innovation Solution
A driving module with processing circuitry and Hall sensors is used to control a motor's shaft rotation, receive sensing signals, and determine the normal arrangement of Hall sensors within the motor based on these signals, ensuring accurate motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor state determination methods are not implemented, then the device complexity remains low, but the reliability of assistance force provision deteriorates
Solution Approach 1:
The system performs preliminary determination of motor state (normal/abnormal operation) before providing assistance force. The processor determines whether the motor is operating normally based on rotation angle data from Hall sensors, and only provides assistance force when normal operation is confirmed, preventing ineffective or harmful assistance during abnormal motor states
Solution Approach 2:
The system continuously monitors motor rotation angle through Hall sensors and feeds this information back to the processor. The processor compares the rotation angle against expected ranges for normal motor operation and adjusts assistance force provision accordingly, creating a closed-loop control system that adapts to motor state changes
2Measurement precision
If Hall sensor sensing is not used, then the manufacturing precision requirements are lower, but the measurement precision of rotation angle deteriorates
Solution Approach 1:
The system uses Hall sensors to continuously measure the rotation angle of the motor shaft and feeds this information back to the processor. The processor determines motor state by analyzing whether the rotation angle falls within expected ranges, enabling precise measurement of motor position and speed without requiring extremely tight manufacturing tolerances on sensor placement
Solution Approach 2:
The system monitors changes in rotation angle parameters over time to determine motor state. By analyzing the dynamic behavior of the rotation angle (whether it changes within expected parameters for normal operation), the system can accurately assess motor health while being tolerant of variations in Hall sensor manufacturing and placement
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 control of assistance or resistance forces in wearable devices, enhancing the effectiveness of walking assistance and exercise assistance modes, and accurately measuring user physical abilities.
Implementation Method 1
a first Hall sensor and a second Hall sensor configured to sense a rotation angle of a shaft of the motor
Data Source
AI summary
A method of determining a state of a motor in a wearable device, such as a walking assist device, may include controlling the motor such that a shaft of the motor rotates at a target speed, receiving a first sensing signal from a first Hall sensor configured to sense a rotation angle of the shaft of the motor, and receiving a second sensing signal from a second Hall sensor, while the shaft of the motor rotates at the target speed, and determining whether the first Hall sensor and the second Hall sensor are arranged normally within the motor based on the first sensing signal and the second sensing signal.