Motor Control Box Serial Port Sealing and Heat Dissipation
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Solution Overview
Problem
Direct current brushless pump motors face issues with cable tightness, heat dissipation, limited control functions, complex installation, lack of communication interfaces, and inadequate heat dissipation structures, leading to operational failures and installation challenges.
Innovation Solution
A motor design with a control box at the bottom and a housing at the top, featuring a sealed platform for cable entry, an overlapped control circuit board with heat dissipation fins, a debug window, rotary dip switches, and a serial port for improved sealing, heat management, and user-friendly installation, along with a metal case for enhanced structural integrity and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If control cable and power line extend from side wall of control box, then cable entry is simple, but tightness is not good enough and water drops enter controller
Solution Approach 1:
The control box is divided into separate sections: a waterproof control box body and a separate cable entry platform. The cable entry platform acts as an independent sealing component that interfaces with the control box, allowing cables to enter through a sealed pathway rather than directly through the control box wall, thus maintaining waterproofing while enabling cable access.
Solution Approach 2:
A cable entry platform serves as an intermediary structure between the external environment and the waterproof control box. This platform provides a sealed transition zone where cables can enter the control box through waterproof seals (such as grommets or sealed conduits) while preventing water ingress into the controller.
2Device complexity
If control circuit board is disposed in control box with small space, then integration is high, but heat dissipation is difficult and temperature raises quickly
Solution Approach 1:
Heat dissipation is enhanced by transitioning from two-dimensional surface mounting to three-dimensional heat sinks with vertical fins. The heat dissipation fins extend upward from the control box bottom, utilizing the vertical dimension to increase heat dissipation surface area without increasing the horizontal footprint of the control box.
Solution Approach 2:
Heat dissipation structures (fins and ventilation channels) are pre-integrated into the control box bottom structure during manufacturing. This preliminary incorporation of heat dissipation features ensures that thermal management capabilities are built-in from the design stage, allowing effective heat dissipation even within the limited space of the control box.
3Device complexity
If no communication interface is left on control box, then structure is simple, but communication with outside world is inconvenient
Solution Approach 1:
The communication interface (serial port) is extracted from the main control box body and relocated to the cable entry platform. This separation allows the control box structure to remain simple and waterproof while providing external communication access through the platform, which is naturally accessible for cable connections.
4Productivity
If impeller is disposed at shaft end of motor, then pump function is achieved, but rotating shaft is difficult to fix during installation
Solution Approach 1:
A shaft fixation structure is pre-integrated into the motor assembly, positioned to engage with the rotating shaft before the impeller is fully installed. This preliminary fixation mechanism (such as a shaft lock or positioning feature) secures the rotating shaft in place during installation, preventing misalignment or movement while allowing the impeller to be mounted afterward.
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
The design enhances cable sealing, improves heat dissipation, simplifies installation and control adjustments, and facilitates communication, ensuring reliable operation and user convenience by addressing the structural and functional limitations of existing direct current brushless pump motors.
Implementation Method 1
the control cable and the power line are sealed via a sealing screw joint and a nut
Implementation Method 2
a metal case with a heat dissipation fin
Data Source
AI summary
A motor with a body, including: a housing, a stator, and a rotor; and a controller, including a control box, and a control circuit board. The body is disposed at the top of the motor. The controller is disposed at the bottom of the motor. The control circuit board is disposed in the control box. The control box extends from a side of the housing and forms a platform. A control cable and a power line enter the control box via the platform, and are connected to the control circuit board. The control cable and the power line are sealed via a sealing screw joint and a nut.