Air Guiding Element for Motor Pole Shoe Protection
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Solution Overview
Problem
Hand-held power tools with electric drive motors face contamination and reduced cooling efficiency due to abrasive dirt particles in the cooling air flow, leading to wear and noise issues.
Innovation Solution
An air guiding element is integrated into the housing, partially covering the pole shoes to protect them from abrasive particles and optimizing the cooling air flow, which also reduces noise and power loss by minimizing turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling air flow is routed through the housing without protection, then cooling efficiency is improved, but the pole shoes are contaminated by abrasive dirt particles
Solution Approach 1:
The housing is segmented into a protected section and an unprotected section by the air guiding element. The air guiding element creates a physical barrier that divides the housing interior, allowing the cooling air flow to pass through one section while the pole shoes remain isolated in the protected section, thus preventing contamination while maintaining cooling efficiency
Solution Approach 2:
The air guiding element acts as an intermediary structure between the cooling air flow and the pole shoes. It allows the cooling air to pass through the housing while blocking the path of abrasive dirt particles from reaching the pole shoes, serving as a protective mediator that enables both cooling and protection functions
2Temperature
If the pole shoes are exposed to the cooling air flow, then cooling coverage is improved, but turbulence and noise increase
Solution Approach 1:
The air guiding element creates different flow conditions in different regions of the housing. The unprotected section allows free flow for cooling, while the protected section maintains laminar flow characteristics. This local differentiation of flow quality reduces turbulence and noise generation while maintaining adequate cooling coverage
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 solution effectively protects the pole shoes from contamination, enhances cooling efficiency, reduces noise, and minimizes power loss by ensuring the pole shoes are outside the cooling air flow path, thereby extending the tool's operational lifespan and improving performance.
Implementation Method 1
a fan wheel, which is driven by the armature shaft of the drive motor and via which a cooling air flow is generated to cool the motor and other components of the machine tool
Implementation Method 2
an air guiding element in the housing forming a section of the flow path of the cooling air flow
Implementation Method 3
The air-guiding element at least partially covers the pole shoes, so that the relevant section of the pole shoes lies outside the flow path of the cooling air flow
Data Source
Figure 1
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AI summary
A machine tool, in particular a powered hand tool, has an electric drive motor to which pole shoes are assigned in order to conduct a magnetic field. Furthermore, a fan wheel is provided in order to produce a stream of cooling air. In the housing, an air-guiding element forms a portion of the flow path for the stream of cooling air, wherein the air-guiding element at least partially covers the pole shoes.