Motor Temperature Estimation Using Hall Sensor Waveform Analysis
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Solution Overview
Problem
Existing motor temperature measurement methods require additional circuitry and wiring, increasing cost and complexity, and may be impractical due to limited space, with potential for incorrect readings from signal line issues, and do not effectively prevent irreversible demagnetization.
Innovation Solution
A method and apparatus using a digital Hall sensor to estimate motor temperature by detecting the rotor's position and calculating the duration difference between operating and release periods, determining the temperature based on pre-stored information or manufacturer data, without the need for a dedicated temperature sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is attached inside the motor to measure temperature, then temperature measurement accuracy is improved, but device complexity and cost increase due to additional circuit configuration and wiring
Solution Approach 1:
The Hall sensor, originally designed solely for rotor position detection, is repurposed to perform both position detection and temperature estimation functions. By analyzing the operating and release period durations from the Hall sensor's output waveform, the system derives temperature information without requiring a dedicated temperature sensor, thus reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent combines the temperature sensing function with the existing Hall sensor system. Instead of adding a separate temperature sensor and its associated circuitry, the solution merges temperature estimation into the Hall sensor's existing operational data, consolidating multiple functions into a single sensor system
2Measurement precision
If a temperature sensor is attached inside the motor, then temperature measurement capability is improved, but motor volume increases due to limited space for sensor installation
Solution Approach 1:
The patent extracts the temperature measurement function from the physical temperature sensor and relocates it to the Hall sensor's data processing capability. This removes the need for additional hardware components that would occupy space within the motor, maintaining temperature measurement capability while preserving compact motor design
Solution Approach 2:
The Hall sensor performs dual functions: rotor position detection and temperature estimation. This multi-functionality eliminates the need for a separate temperature sensor that would consume valuable internal motor space, allowing the same component to serve multiple purposes without increasing volume
3Temperature
If a temperature sensor is installed in the motor, then temperature monitoring is improved, but reliability decreases due to potential signal line closure or opening
Solution Approach 1:
The Hall sensor uses its own existing output waveform data to estimate temperature, rather than relying on separate temperature sensor signal lines that could fail. The temperature information is derived from the sensor's normal operational signals, making the system self-sufficient and eliminating vulnerability to additional signal line failures
Solution Approach 2:
The solution extracts temperature information from the Hall sensor's existing output waveform without requiring separate temperature sensor signal lines. This removes the additional wiring and connection points that could fail, improving overall system reliability while maintaining temperature monitoring capability
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 accurate temperature estimation within the motor, reducing size and cost, and preventing irreversible demagnetization by using a digital Hall sensor to calculate temperature differences, thus extending motor lifespan and preventing damage.
Implementation Method 1
a digital Hall sensor configured to detect a position of a rotor included in a motor
Data Source
AI summary
The present disclosure relates to an apparatus and method for estimating a temperature of a motor using a Hall sensor. The method includes detecting, at a digital Hall sensor, a position of a rotor included in a motor and outputting an on signal in an operating period and an off signal in a release period according to a relative position of the rotor, calculating, at a temperature determining module, a difference between duration of the operating period and duration of the release period according to an output waveform of the digital Hall sensor, and then determining, at the temperature determining module, a temperature of the motor with reference to a temperature corresponding to the duration difference. Accordingly, it is possible to estimate the internal temperature of a motor without installing a temperature sensor in the motor, to maintain a small size of the motor, and to reduce production costs.