Brushless DC Motor Hall Sensor Positioning Structure
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Solution Overview
Problem
Conventional brushless DC motors experience inaccurate magnetic induction data due to inconsistent distances between Hall circuit boards and magnetic tiles, leading to installation challenges and reduced accuracy.
Innovation Solution
The design includes a base with a cylindrical sleeve and insulation seat, where the Hall circuit board is positioned within a recess on the insulation seat, ensuring consistent spacing between Hall elements and magnetic tiles, and a stator assembly with a contact pin that connects through specific holes for accurate electrical connection, along with features like T-shaped columns for magnetic tile retention and a groove for aluminum scrap collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the Hall circuit board is disposed on the control panel through an extension socket and contact pins, then the installation is flexible, but the distance between the Hall circuit boards and magnetic tiles becomes inconstant, leading to inaccurate magnetic induction data
Solution Approach 1:
The patent introduces a positioning structure (protrusion and recess mechanism) as an intermediary between the control panel and Hall circuit board. This positioning structure ensures that the Hall circuit board is accurately positioned relative to the magnetic tiles, maintaining a constant distance while still allowing for flexible installation through the extension socket and contact pins.
Solution Approach 2:
The control panel is pre-equipped with a positioning structure (protrusion) that guides the Hall circuit board into the correct position during installation. The recess on the Hall circuit board is designed to fit onto the protrusion, ensuring proper alignment before the actual installation is completed, thereby guaranteeing accurate magnetic induction data from the outset.
2Ease of manufacture
If the distance between Hall circuit boards and magnetic tiles is not standardized, then installation is simpler, but the magnetic induction data becomes inaccurate
Solution Approach 1:
The positioning structure creates a standardized reference level or 'potential' for the distance between the Hall circuit board and magnetic tiles. By using the protrusion and recess mechanism, all installations automatically achieve the same optimal distance, eliminating variability while maintaining installation simplicity.
3Productivity
If the Hall element positioning is not precise, then the installation process is faster, but the magnetic induction accuracy deteriorates
Solution Approach 1:
The positioning structure enables the Hall circuit board to self-position during installation. The recess on the Hall circuit board automatically aligns with and fits onto the protrusion on the control panel, ensuring precise positioning without requiring complex alignment procedures or specialized tools, thereby maintaining both installation speed and accuracy.
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 simplifies Hall element installation, ensures accurate magnetic induction data, enhances electrical connection reliability, prevents aluminum scraps from causing short circuits, and balances stress for improved motor performance.
Implementation Method 1
at least one Hall element is secured to the Hall circuit board; and the at least one Hall element faces towards the protrusion
Data Source
AI summary
A brushless DC motor, including a base, an insulation seat, a rotor assembly, a revolving shaft, a stator assembly, a control panel, a Hall circuit board, and an end cover. The revolving shaft is connected to the rotor assembly. The rotor assembly includes a housing and a plurality of magnetic tiles. The housing includes an inner wall and a cavity defined by the inner wall. The plurality of magnetic tiles is disposed on the inner wall. The stator assembly is disposed in the cavity. The base includes a cylindrical sleeve extending from a center of the base to the cavity of the rotor assembly. The stator assembly is connected to the cylindrical sleeve; two ends of the cylindrical sleeve are provided with a first bearing and a second bearing, respectively; and two ends of the revolving shaft are supported by the first bearing and the second bearing, respectively.