Brushless DC Motor Type Identification via Tachometer Pulse Counting
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Solution Overview
Problem
Existing methods for identifying brushless DC motors require complex handshaking between the system controller and the motor, making it difficult to easily distinguish between different types of brushless DC motors.
Innovation Solution
A method and apparatus that utilize the varying number of pulses per rotation or unit time outputted from tachometer terminals to identify the type of brushless DC motor without handshaking, by supplying power, counting pulses, and referencing a lookup table for unique information pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If handshaking communication is used to identify brushless DC motor types, then identification accuracy is improved, but device complexity and software requirements increase
Solution Approach 1:
The patent extracts the identification function from complex handshaking communication and implements it through a dedicated identification circuit that reads identification information directly from the motor's circuit board. This separates the identification function from the control software, eliminating the need for complex handshaking protocols while maintaining accurate identification.
Solution Approach 2:
The patent introduces an identification circuit as an intermediary component that facilitates motor type identification by reading identification information from the motor's circuit board. This intermediary handles the identification task independently, preventing the need for complex software-based handshaking between the controller and motor.
2Reliability
If handshaking communication is implemented between system controller and fan motor, then compatibility determination is improved, but ease of operation deteriorates due to complicated software requirements
Solution Approach 1:
The patent enables the identification system to serve itself by automatically reading identification information from the motor's circuit board through the identification circuit. This self-service mechanism eliminates the need for complex software handshaking and mode switching, making the system easier to operate while maintaining reliable compatibility determination.
3Measurement precision
If complex handshaking software is used for motor identification, then identification accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a simple identification circuit with basic reading functionality instead of complex software handshaking systems. This approach uses simpler, more cost-effective components for motor identification, reducing manufacturing costs while maintaining sufficient identification accuracy for distinguishing motor types.
Data Source
AI summary
An identification method is an identification method for use in an identification apparatus that identifies types of brushless DC motors each including a circuit board on which a terminal for tachometer is mounted. The numbers of pulses per rotation or unit time outputted from the terminals for tachometer vary among multiple types of brushless DC motors. The identification method includes: supplying a power supply voltage from the identification apparatus to a brushless DC motor; inputting a pulse signal outputted from the terminal for tachometer of the circuit board to the identification apparatus; counting the number of pulses in the pulse signal; obtaining a unique information piece of the brushless DC motor based on the counted number of pulses; and identifying a type of the brushless DC motor based on the unique information piece of the brushless DC motor.