Motor Driving Method Reducing Hall Sensor Sensitivity Requirements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor driving methods struggle to reduce production costs and prevent interference noise, particularly when the differential magnetic pole sensing signals approach zero-crossing points, requiring sensitive Hall sensors and complex manufacturing processes.
Innovation Solution
A driving method and device that sense magnetic pole variations to determine a dead zone and adjust voltage output to the motor coil, using an embedded Hall sensor with reduced sensitivity requirements, allowing for linear voltage variation during commutation and stable output outside the dead zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Hall sensor sensitivity is upgraded to prevent interference when differential magnetic pole sensing signals approach zero-crossing point, then the motor operation reliability is improved, but the manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent applies preliminary action by determining the dead zone range before the motor actually operates in that region. The microcontroller pre-calculates the dead zone based on the relationship between differential magnetic pole sensing signals and rotor position, then uses this predetermined information to adjust voltage output proactively when the motor enters the dead zone, preventing noise issues before they occur rather than requiring higher sensor sensitivity to detect and respond to them in real-time
Solution Approach 2:
The patent implements beforehand cushioning by compensating for the potential noise problem before it occurs. When the differential magnetic pole sensing signals indicate that the motor is approaching or entering the dead zone, the system preemptively adjusts the voltage output to the coil to ensure linear voltage variation continues during commutation. This anticipatory compensation prevents the noise that would otherwise occur due to non-linear voltage changes, eliminating the need for high-sensitivity Hall sensors
2Reliability
If the Hall sensor sensitivity is upgraded to prevent interference when differential magnetic pole sensing signals approach zero-crossing point, then the motor operation reliability is improved, but the device complexity increases
Solution Approach 1:
The system performs preliminary calculation of the dead zone range using the microcontroller's processing capabilities, storing this information for subsequent use. This preliminary action transforms a potentially complex real-time detection problem into a simpler control problem based on predetermined parameters, reducing the need for complex hardware circuits while maintaining reliability
Solution Approach 2:
The patent replaces the need for high-sensitivity Hall sensor hardware with a software-based solution. Instead of relying on sophisticated sensor hardware to detect and respond to dead zone conditions, the system uses the microcontroller to process the differential magnetic pole sensing signals, determine dead zone parameters, and adjust voltage output through software control algorithms, thereby reducing device complexity
3Object-generated harmful factors
If the voltage output is adjusted to ensure linear variation during commutation in the dead zone, then the noise reduction is improved, but the control complexity increases
Solution Approach 1:
The patent applies local quality by implementing different voltage control strategies for different operating regions. In the dead zone region, the system ensures linear voltage variation to minimize noise, while outside the dead zone, it uses conventional control methods. This localized approach to noise reduction only applies the more complex control logic where it is actually needed (during commutation in the dead zone), rather than complicating the entire control system
Solution Approach 2:
The microcontroller pre-determines the dead zone range and prepares the appropriate voltage adjustment strategy before the motor enters the problematic region. This preliminary preparation allows the system to smoothly transition into noise-reduction mode without requiring complex real-time decision-making, thereby reducing control complexity while maintaining effective noise suppression
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 reduces manufacturing costs and minimizes interference noise by using a less sensitive Hall sensor, ensuring efficient motor operation and improved noise reduction without the need for complex sensitivity upgrades.
Implementation Method 1
The Hall sensor 100 senses a magnetic pole of the rotator, transforms corresponding sensing results into differential magnetic pole sensing signals H+, H− in voltage form
Implementation Method 2
altering directions and intensity of current in a coil of a rotator of the motor, the motor can generate magnetic force with different strength and magnetic poles, to interact with permanent magnets on stators of the motor, so as to rotate the motor
Data Source
AI summary
A driving method for a motor includes sensing variation of magnetic pole of a rotator of the motor, to generate a magnetic pole sensing signal, determining dead zone of the motor according to the magnetic pole sensing signal, to generate a determination result, and adjusting voltage outputted to a coil of the rotator according to the determination result.