Brushless DC Motor Identification via Resistance Measurement
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Solution Overview
Problem
Conventional methods for identifying brushless DC motors are complex and require complicated control software, involving handshaking between the motor and system controller, making it difficult to easily identify information about brushless DC motors.
Innovation Solution
An identification method that supplies an input voltage to the brushless DC motor via a power supply line, reads the resistance value of a resistor connected between the power supply line and GND, and identifies the motor type based on this resistance value, eliminating the need for handshaking and simplifying the identification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional handshaking communication is used between system controller and fan motor, then identification information can be obtained, but control software becomes complicated and identification process becomes complex
Solution Approach 1:
The patent extracts the identification function from the complex handshaking communication process. By placing a dedicated identification resistor in the fan motor circuit, the identification information is physically separated from the control software logic. The system controller only needs to measure resistance value rather than implement complex communication protocols, thus simplifying control software while maintaining accurate identification.
Solution Approach 2:
The patent replaces the electronic communication-based identification system with a physical resistance-based identification system. Instead of using complex electrical handshaking signals and software protocols, the system uses a simple resistance measurement through a dedicated identification resistor. This substitution transforms the identification mechanism from software-intensive to hardware-based, significantly reducing control software complexity.
2Measurement precision
If handshaking communication is implemented, then fan identification information can be determined, but the number of required terminals and communication lines increases
Solution Approach 1:
The patent makes the power supply line serve multiple functions: it provides both power delivery and identification signal transmission. By placing the identification resistor between the power supply line and GND, the existing power supply terminal becomes dual-functional, eliminating the need for separate identification terminals. This multi-functionality approach reduces the number of required terminals while maintaining accurate identification capability.
Solution Approach 2:
The patent merges the identification function with the power supply function. The identification resistor is connected in parallel with the power supply line, allowing the same physical connection to serve both power delivery and identification purposes. This consolidation eliminates separate identification terminals and communication lines, reducing the overall number of required connections.
3Reliability
If complex control software is used for identification, then fan motor compatibility can be determined, but processing load on system controller increases
Solution Approach 1:
The patent replaces software-based compatibility determination with hardware-based resistance measurement. Instead of executing complex communication protocols and handshaking sequences that consume processor resources, the system controller simply measures the resistance value of the identification resistor. This substitution dramatically reduces processing load while maintaining reliable compatibility determination through straightforward resistance value comparison.
4Device complexity
If simple resistance measurement is used for identification, then control software is simplified, but the resistor must be reliably connected in the circuit
Solution Approach 1:
The patent segments the identification function into a dedicated physical component (identification resistor) that is separately implemented in the fan motor circuit. This segmentation ensures that the identification function is physically isolated and reliably connected through dedicated circuitry, independent of other motor components. The identification resistor is specifically placed between the power supply line and GND, creating a reliable and dedicated identification path that enhances identification reliability.
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 method allows for easy and efficient identification of brushless DC motor types without the need for complex control software, reducing the load on the identifier and minimizing the number of required terminals, thereby reducing product costs and simplifying the identification process.
Implementation Method 1
reading a resistance value of the at least one resistor in a state where an inverter of the brushless DC motor is off
Data Source
AI summary
A brushless DC motor identification method capable of identifying information on a brushless DC motor, particularly without performing any handshaking, includes supplying an input voltage from an identifier to a brushless DC motor including at least one resistor connected between a power supply line and a GND line, reading a resistance value of at least one resistor in a state where the inverter of the brushless DC motor is off, and identifying information on the brushless DC motor based on the read resistance value.