Electric Motor Hall Circuit Board Orientation for Heat Dissipation
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Solution Overview
Problem
Conventional electric tools suffer from poor heat dissipation due to the placement of Hall elements blocking airflow paths, and they lack the ability to adjust rotation speed without replacing hardware.
Innovation Solution
The electric motor design separates the Hall unit and wiring circuit unit, allowing for improved airflow and adjustable rotation speed by changing the Hall circuit board's angle during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Hall elements are placed close to the rotor to improve sensing accuracy, then the induction effect is improved, but the airflow path is blocked and heat dissipation deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement (Hall elements on a flat circuit board) to a three-dimensional spatial arrangement (Hall elements on a cylindrical surface). By wrapping the Hall circuit board around the rotor in a circumferential direction, the Hall elements can be positioned close to the rotor for accurate sensing while the cylindrical configuration allows airflow to pass through the central opening, resolving the heat dissipation issue.
2Ease of operation
If the circuit board is made large enough to accommodate the wiring module for convenient electrical connection, then the wiring connection is improved, but the volume of the circuit board increases and blocks more airflow
Solution Approach 1:
The patent integrates the wiring module directly onto the Hall circuit board, nesting one functional component within another. The wiring module is disposed on the same circuit board that carries the Hall elements, eliminating the need for a separate, larger circuit board. This integrated approach maintains wiring connection convenience while minimizing the overall volume and airflow obstruction.
3Device complexity
If the Hall unit and wiring circuit are integrated on the same circuit board, then the structure is simplified, but the volume increases and heat dissipation worsens
Solution Approach 1:
The patent segments the circuit board into functionally distinct regions: a Hall element region for sensing and a wiring module region for electrical connections. This segmentation allows each region to be optimized for its specific function while maintaining a compact overall structure. The separated functional zones enable better airflow management and heat dissipation compared to a fully integrated design.
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 design enhances heat dissipation and allows for adjustable rotation speed without replacing hardware, improving the performance of electric tools.
Implementation Method 1
a Hall module disposed on the Hall circuit board and corresponding to the rotor and used to sense rotation of the rotor
Data Source
AI summary
The present invention relates to an electric motor and an electric tool equipped with the electric motor. The electric motor includes a rotor, a stator, a coil module wound around the stator, a Hall unit and a wiring circuit unit. The Hall unit includes a Hall circuit board disposed around a rotating shaft of the rotor, and a Hall module for sensing rotation of the rotor. The wiring circuit unit is independent of the Hall circuit board and includes a three-phase power source interface. The wiring circuit unit electrically connects coils of the coil module to the power source interfaces respectively by groups. By separately disposing the Hall unit and the wiring circuit unit independently, a volume of the Hall circuit board can be reduced, and an area blocking an airflow path of a heat dissipation unit can be reduced, so heat dissipation effect of the electric motor and the electric tool can be improved.