Motor Control Device Dummy Pin Terminals Vibration Stress
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Solution Overview
Problem
Existing motor control devices face challenges with disconnection and increased costs due to motor vibrations, as flexible printed circuits are prone to disconnection at soldered terminals, and existing solutions like adhesive tapes and agents have limitations such as high material costs, unstable quality, and adherence issues.
Innovation Solution
A motor control device design that incorporates dummy pin terminals and wiring pattern lands on a circuit board, which are electrically disconnected from the control circuit, to distribute the load and reduce the stress on the connected terminals, along with a FPC holder to secure the flexible printed circuit to the motor, thereby reducing disconnection risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tapes or adhesive agents are used to reinforce fixation, then disconnection or fracture is prevented, but manufacturing cost increases and manufacturing complexity increases
Solution Approach 1:
The invention divides the terminal structure into multiple segments: real terminals for electrical connection and dummy terminals for mechanical reinforcement. The dummy terminals are separate structural elements that do not participate in electrical conduction but provide additional support to the flexible printed circuit, preventing disconnection without requiring adhesive tapes or agents.
Solution Approach 2:
The dummy terminals are copies of the real terminal structure in form but not in function. They replicate the mechanical configuration of the real terminals to provide equivalent structural support and reinforcement, while being electrically isolated. This allows the system to benefit from the mechanical strength of additional terminals without the complexity of managing active electrical connections.
2Strength
If adhesive agents are used for fixation, then connection strength is improved, but manufacturing precision deteriorates due to difficulty in control
Solution Approach 1:
The invention replaces the chemical bonding mechanism of adhesive agents with a mechanical bonding mechanism. The dummy terminals provide structural reinforcement through physical presence and geometric configuration, creating mechanical interlocking with the flexible printed circuit. This eliminates the need for adhesive application, drying time, and quality control associated with adhesive agents.
3Reliability
If dummy terminal is added to increase connection reliability, then disconnection resistance is improved, but device complexity increases
Solution Approach 1:
The invention extracts the mechanical reinforcement function from the electrical connection function. By creating separate dummy terminals that are electrically isolated from the circuit board, the design allows the terminal structure to serve dual purposes: real terminals handle electrical connection while dummy terminals provide purely mechanical support. This separation simplifies the overall design by avoiding the need for complex electrical routing to dummy terminals.
Data Source
AI summary
A motor control device includes a circuit board having a control circuit controlling electric power to be supplied to a motor, a base fixedly supporting the circuit board, a flexible printed circuit supplying electric power to the motor, a pin terminal disposed on the circuit board, being electrically connected with the control circuit, a dummy pin terminal disposed on the circuit board, being electrically free from the control circuit, a wiring pattern land disposed on the FPC, being electrically connected with the pin terminal, and a dummy wiring pattern land disposed on the FPC, being connected with the dummy pin terminal.