Electric Grinding Machine Motor Cooling Through Nested Annular Structures
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Solution Overview
Problem
Conventional electric grinding machines generate excessive heat due to the electric motor and control circuit board, causing discomfort to users and are prone to dust ingress due to restricted airflow member positioning.
Innovation Solution
An electric grinding machine design featuring a housing with inlet holes, an electric motor with openings and annular structures, and an airflow generating member that generates a heat dissipation airflow through the motor surface, while using annular structures to block dust without obstructing airflow, maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor is equipped with a motor end plate to limit dust entry, then dust-proof performance is improved, but the positioning of the airflow generating member is restricted
Solution Approach 1:
The airflow generating member is nested within the housing space defined by the motor end plate and housing body. The member is positioned in the remaining space after the motor end plate is installed, utilizing the nested structure to achieve both dust-proof sealing and proper airflow generation positioning without conflicting with the motor end plate's dust-blocking function
2Temperature
If heat dissipation airflow flows through the electric motor surface, then motor temperature is reduced, but dust may enter the motor
Solution Approach 1:
The motor end plate is designed with localized openings at specific positions that allow heat dissipation airflow to pass through while maintaining dust-proof performance in other areas. The openings are strategically positioned to enable thermal management through the motor surface while the surrounding sealed structure prevents dust entry, achieving local quality differentiation between cooling passages and sealed regions
3Reliability
If additional components are added to block dust, then dust-proof performance is improved, but device volume increases
Solution Approach 1:
The motor end plate serves multiple functions simultaneously: it acts as a dust-proof barrier, provides structural support for the airflow generating member, and incorporates openings that enable heat dissipation. By making the motor end plate multi-functional, the design achieves effective dust blocking without requiring additional separate components, thereby maintaining compact device volume
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
Effectively reduces motor temperature for user comfort and prevents dust ingress, maintaining a compact design without additional components, enhancing user experience and machine efficiency.
Implementation Method 1
The airflow generating member rotates with the electric motor, the airflow generating member generates a heat dissipation airflow in the housing, and the heat dissipation airflow enters from the at least one inlet hole, flows through a surface of the electric motor
Data Source
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AI summary
An electric grinding machine (20) includes a housing (21), an electric motor (22) disposed in the housing (21), a motor end plate (23) disposed in the housing (21) and provided for disposal of the electric motor (22), and an airflow generating member (24) connected to the electric motor (22). The housing (21) is formed with at least one inlet hole (211). The motor end plate (23) is formed with at least one opening (231) without being shielded by the electric motor (22), and at least one first annular structure (232) disposed at a side distanced from the electric motor (22). The airflow generating member (24) rotates with the electric motor (22), so that a heat dissipation airflow (31) generated in the housing (21) enters from the at least one inlet hole (211) and flows through a surface of the electric motor (22), and passes through the at least one opening (231). The airflow generating member (24) is formed with at least one second annular structure (241) matched with the at least one first annular structure (232).