Motor Electronic Component Terminal Configuration
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Solution Overview
Problem
In electronic modules used in motors, the distance between the electronic circuit and the magnet can be large, leading to ineffective sensing of magnetism, as the circuit is often positioned far from the magnet, resulting in poor magnetic field detection.
Innovation Solution
The motor design includes a circuit board with an electronic component mounted on it, where the component's terminals are arranged in a bent configuration, allowing the sensor portion to be closer to the magnet, and the component is partially inserted into a board hole, reducing the motor's axial thickness and improving magnetic field sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic component is mounted on the board surface with straight terminals, then the electrical connection is simple, but the distance between the electronic circuit and the magnet becomes large, resulting in poor magnetic field sensing
Solution Approach 1:
The terminal portions are configured to extend in multiple directions (first direction not parallel to axial direction, then downward, then again in first direction) rather than straight lines, allowing the sensor to reach closer to the magnet while maintaining electrical connection to the board
2Measurement precision
If the electronic component is positioned closer to the magnet, then magnetic field sensing improves, but the component cannot be properly mounted on the board with standard terminal configurations
Solution Approach 1:
The terminal structure is divided into multiple segments (first terminal portion, second terminal portion, third terminal portion) that can be positioned independently, with the sensor portion in the body placed close to the magnet while terminal portions extend to connect to the board
3Length of stationary object
If the component body is fully inserted into the board hole, then the motor thickness is reduced, but the terminals may not reach the metal pads for proper electrical connection
Solution Approach 1:
The terminals extend in a three-dimensional path (first direction not parallel to axial direction, then downward, then again in first direction) allowing the component body to be positioned deep in the board hole for thin motor design while terminals still reach the metal pads on the board surface
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
This configuration enables accurate sensing of the magnet's position and reduces the motor's thickness, enhancing its magnetic field detection capabilities.
Implementation Method 1
a third terminal portion extending in the first direction from the second terminal portion, and joined to a lower surface of the circuit board through solder
Data Source
AI summary
A motor includes a stationary portion including an annular stator centered on a central axis extending in a vertical direction, and a rotating portion including a magnet radially opposite to the stator, and rotatable about the central axis. The stationary portion includes a circuit board axially below the magnet and an electronic component mounted on the circuit board, the circuit board includes a board hole passing therethrough in an axial direction. The electronic component includes a component body portion including at least a portion thereof in the board hole, a first terminal portion extending in a first direction from the component body portion, the first direction being not parallel to the axial direction, a second terminal portion extending downward from the first terminal portion, and a third terminal portion extending from the second terminal portion, and joined to the circuit board through solder.