Brushless DC Motor Circuit Board With Rewritable Memory Port
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Solution Overview
Problem
Conventional brushless DC motors with one-time programmable read-only memory (OTP-ROM) require replacement when design changes are needed, leading to inefficiencies in manufacturing due to the inability to modify the control program after installation, resulting in increased production time and costs.
Innovation Solution
A brushless DC motor design featuring a circuit board with a non-volatile rewritable memory and a writing terminal port accessible from the rotor side, allowing for data modification without replacing the circuit board, enabling flexible configuration and efficient manufacturing by allowing data to be written after or during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If OTP-ROM is used for the micro computer memory, then the micro computer is inexpensive, but the control program cannot be modified after installation requiring costly and time-consuming replacement
Solution Approach 1:
The patent applies preliminary action by providing a writing terminal port that enables program writing to be performed in advance during the manufacturing process before the motor is shipped. This allows the control program to be written to the OTP-ROM micro computer while the circuit board is still accessible, eliminating the need for future replacements when design changes are needed.
Solution Approach 2:
The patent introduces an intermediary element - the writing terminal port - that provides access to the OTP-ROM micro computer's programming interface. This port serves as a mediator between external programming equipment and the embedded micro computer, enabling flexible program updates without hardware replacement while maintaining the cost benefits of OTP-ROM.
2Volume of moving object
If the circuit board is installed inside the motor, then the motor structure is compact, but the circuit board becomes inaccessible for program writing
Solution Approach 1:
The patent applies segmentation by separating the writing terminal port function from the main circuit board operations. The writing terminal port is positioned at a location that can be accessed during manufacturing when the circuit board is still partially accessible, allowing program writing to be performed as a distinct operation before final assembly closure.
Solution Approach 2:
The patent performs the program writing action preliminarily during the manufacturing process before the motor housing is fully assembled. By writing the control program to the micro computer while the writing terminal port is still accessible, the system maintains compact final assembly while enabling flexible program updates during production.
3Adaptability or versatility
If micro computer replacement is required for design changes, then the control program can be updated, but manufacturing time and costs increase significantly
Solution Approach 1:
The patent performs the control program update action preliminarily during the manufacturing process itself, before the motor is completed and shipped. By providing access to the writing terminal port during assembly, the program can be written once and updated if needed without time-consuming micro computer replacement operations later.
Solution Approach 2:
The patent enables the micro computer to be programmed through a self-service mechanism where the writing terminal port allows direct access to the OTP-ROM for program writing. This eliminates the need for complex replacement procedures and enables quick program updates during manufacturing, significantly improving production efficiency.
Data Source
AI summary
A brushless DC motor includes an embedded memory of a micro computer mounted on a circuit board which can be modified during and/or after a manufacturing process of the brushless DC motor. The circuit board installed on the brushless DC motor includes an IC having the embedded micro computer executing feed back control of the pulse wide modulation and the embedded memory for storing data such as control programs. The circuit board also includes a writing terminal port to which an external memory writer is to be connected. Data is transferred from the external memory writer and stored in the embedded memory by contacting the writing terminal port with a tip end portion of a cable from the external memory writer.