BLDC Motor Hall Sensor Verification for Position Signal Reliability
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Solution Overview
Problem
Existing motor driving devices for BLDC motors lack an effective method to verify the position signal reliability and detect defects in Hall sensors, which is crucial for ensuring motor control reliability and safety.
Innovation Solution
A motor driving device and method that utilize multiple position detection sensors, including a self-diagnosing ASIL-rated Hall sensor and QM-rated Hall sensors, to determine sensor defects by comparing position signals and using voltage levels to diagnose faults in Hall sensors and their circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple position detection sensors are used to verify position signal reliability, then measurement precision and reliability are improved, but device complexity increases
Solution Approach 1:
The patent uses an ASIL-rated Hall sensor as an intermediary verification mechanism. This sensor serves dual purposes: it provides primary position detection and simultaneously acts as a reference to verify the accuracy of QM-rated Hall sensors. By making one sensor self-diagnosing and using it to validate others, the system achieves multi-sensor verification without proportionally increasing complexity.
Solution Approach 2:
The ASIL-rated Hall sensor performs self-diagnosis of its own operational status and uses this self-verified information to validate other sensors. This self-service capability reduces the need for external verification systems, allowing the sensor to both monitor itself and contribute to the verification of the broader sensor network, thereby improving reliability while managing complexity.
2Reliability
If ASIL-rated sensors are used to verify QM-rated sensors, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The ASIL-rated Hall sensor is designed with multi-functionality, serving both as a primary position detection sensor and as a verification reference for QM-rated sensors. This universal design allows one high-reliability sensor to validate multiple lower-cost sensors, reducing the total number of ASIL-rated sensors needed while maintaining verification reliability across the system.
Solution Approach 2:
The patent changes the reliability parameters of the sensor system by using one ASIL-rated sensor (higher reliability) to verify multiple QM-rated sensors (lower reliability). This parameter differentiation allows the system to achieve overall high reliability through selective verification rather than requiring all sensors to be ASIL-rated, thereby reducing manufacturing costs while maintaining safety standards.
3Reliability
If self-diagnosis capability is added to position detection sensors, then reliability is improved, but device complexity increases
Solution Approach 1:
The Hall sensor incorporates self-diagnosis functionality that allows it to autonomously monitor its own operational status and detect defects without external intervention. This self-service capability enables the sensor to identify its own failures and provide verification information for other sensors, improving system reliability while avoiding the need for separate external diagnosis systems that would increase complexity.
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
This approach enables reliable detection of sensor defects, reduces the need for additional connection lines, and achieves cost savings by using ASIL-rated sensors to verify the integrity of QM-rated sensors, thereby ensuring motor control reliability and safety.
Implementation Method 1
The position of the rotor is detected using a Hall sensor
Data Source
AI summary
A motor driving device according to one embodiment of the present invention comprises: a first position detection sensor for detecting the position of a motor and self-diagnosing a defect; a second position detection sensor for detecting the position of the motor; and a control unit for receiving a position signal and a self-diagnosis signal from the first position detection sensor and receiving a position signal from the second position detection sensor, wherein the control unit determines whether the first position detection sensor is normal according to the defect self-diagnosis signal and, if the first position detection sensor is normal, determines whether the second position detection sensor is defective by using the position signal of the first position detection sensor.