Brushless DC Motor Drive Circuit Superimposed Signal Identification
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Solution Overview
Problem
Conventional methods lack an efficient way to identify the type of brushless DC motors, which is essential for various applications, including electronic devices and industrial systems, where differentiation is crucial for proper functioning and management.
Innovation Solution
A method and device that utilize a superimposed signal output from the brushless DC motor, where the signal is separated into distinct types using a demodulating circuit, allowing the identification device to determine the motor type based on unique duty ratios or frequencies of the high-frequency signal superimposed with the TACH signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional identification methods are used for brushless DC motors, then the identification process becomes complex and time-consuming, but the wiring complexity and circuit configuration remain simple
Solution Approach 1:
The patent changes the parameter of signal frequency by superimposing high-frequency signals with different frequencies onto the TACH signal. The identification device detects these frequency differences to determine motor type, replacing complex identification methods with simple frequency-based differentiation. This resolves the contradiction by enabling fast identification through parameter variation without increasing device complexity.
Solution Approach 2:
The patent uses a simple, cost-effective circuit configuration that generates and detects high-frequency signals temporarily for identification purposes. The superimposed signals are transmitted only during the identification phase, allowing quick motor type detection without requiring permanent complex identification hardware. This resolves the contradiction by using simple, temporary signal-based identification instead of complex permanent systems.
2Measurement precision
If additional wiring is added to enable motor type identification, then identification accuracy improves, but wiring complexity and circuit configuration increase
Solution Approach 1:
The patent merges the motor type identification function with the existing TACH signal transmission line. By superimposing high-frequency identification signals onto the existing TACH signal, the system achieves accurate motor type detection without adding separate wiring. The identification information is combined with the operational signal, resolving the contradiction by maintaining wiring simplicity while improving measurement precision.
Solution Approach 2:
The TACH signal line serves dual functions: it transmits both the operational tachometer signal and the superimposed high-frequency identification signal. This multi-functionality allows accurate motor type identification without requiring additional dedicated wiring for identification purposes. The single signal line performs multiple roles, resolving the contradiction between identification accuracy and wiring complexity.
3Device complexity
If a simple circuit configuration is used for signal processing, then cost and device complexity are reduced, but the ability to separate and identify different signal types deteriorates
Solution Approach 1:
The patent uses high-frequency signal vibrations superimposed on the TACH signal to encode motor type information. The simple circuit configuration generates these high-frequency vibrations, and the identification device detects them through frequency analysis. This resolves the contradiction by using frequency-domain separation through signal vibration rather than complex time-domain processing, maintaining circuit simplicity while achieving accurate signal separation.
Solution Approach 2:
The patent employs periodic high-frequency signals with different frequencies for different motor types. The simple circuit configuration generates these periodic signals, and the identification device separates them based on their periodic characteristics and frequency differences. This resolves the contradiction by using periodic signal properties for easy separation without requiring complex processing circuits.
Data Source
AI summary
The identification method according to an embodiment is used for an identification device for identifying the type of a brushless DC motor. A brushless DC motor includes an output terminal for outputting a signal. The output terminal is able to output a signal obtained by superimposing signal types. The signal resulting from the superimposition is different depending on the types of brushless DC motors. In the identification method, power is supplied to a brushless DC motor, and the signal resulting from the superimposition that is output from the output terminal of the brushless DC motor is input to an identification device. The signal resulting from the superimposition is separated into signal types, and the separated signals are used to identify the type of the brushless DC motor.