Electric Machine Tool Housing Guide Structure Cooling
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Solution Overview
Problem
Electric machine tools, particularly core drills, face challenges with heat dissipation as motor power increases, leading to insufficient cooling and increased costs and space requirements when optimizing fans.
Innovation Solution
A housing with a guide structure that directs cooling air to the motor, specifically through a motor mount, which can be adapted to different motor sizes, enhancing airflow and filtering out impurities, and allowing for efficient heat dissipation by positioning the motor mount near the commutator and using a plate-shaped base body with a gap to increase flow velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor power is increased to improve productivity, then the heat generation increases sharply leading to insufficient cooling
Solution Approach 1:
The guide structure directs cooling air to specific local areas of the motor that generate the most heat, such as the commutator region. This localized cooling approach efficiently dissipates heat from critical components without requiring system-wide cooling enhancements.
Solution Approach 2:
The guide structure acts as an intermediary element between the cooling air source and the motor components. It channels and directs the cooling air flow to where it is most needed, improving cooling efficiency without requiring additional cooling power.
2Temperature
If fans are optimized or additional fans are installed to improve cooling capacity, then the cooling power increases, but the costs and space requirements increase
Solution Approach 1:
The guide structure utilizes the existing cooling air flow and directs it effectively without requiring additional active cooling components. The system serves itself by optimizing the use of available cooling resources through intelligent airflow management rather than adding more powerful cooling equipment.
Solution Approach 2:
The guide structure changes the parameters of the cooling air flow by directing it to specific locations and maintaining appropriate flow velocity. This optimization of flow parameters improves cooling efficiency without requiring changes to the fan system itself.
3Temperature
If additional cooling components are added to improve heat dissipation, then the cooling effectiveness increases, but the costs and space requirements increase
Solution Approach 1:
The guide structure is integrated into the existing housing and motor mount structure, merging the cooling airflow guidance function with the structural components. This eliminates the need for separate, additional cooling components that would occupy extra space.
Solution Approach 2:
The guide structure serves multiple functions: it guides cooling air flow, structurally supports the motor mounting, and can be adapted to different motor sizes. This multi-functionality reduces the need for additional specialized components.
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 solution reduces motor temperature by up to 30 K, improves operational reliability, and allows for the use of various motor sizes in a single housing, reducing costs and maintaining compactness.
Implementation Method 1
a guide structure, providing air guidance for the cooling air and associated with a motor mount in which the motor is at least partially accommodated, is disposed in the air guide duct downstream of the at least one air inlet
Implementation Method 2
the motor mount is disposed in the area of the commutator of the motor, because a great deal of heat is generated in particular here, which then has to be dissipated again
Implementation Method 3
a gap, which has a width which lies between 10% and 30% and particularly preferably between 15% and 20% of the motor shaft diameter, is formed between the motor mount and the part of the motor surrounded by the motor mount
Data Source
AI summary
A housing for an electric machine tool, in particular for a core drill, said housing in which a motor is accommodated, which has a motor shaft for driving a tool mount and to which cooling air is supplied through at least one air guide duct, which is delimited at one end by at least one air inlet and at the other end by at least one air outlet. A guide structure, providing air guidance for the cooling air and associated with a motor mount, in which the motor is at least partially accommodated, is disposed in the air guide duct downstream from the at least one air inlet.