Motor Support Cage for Battery-Powered String Trimmers
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Solution Overview
Problem
Battery-powered string trimmers face limitations in accommodating and supporting heavier and higher performing batteries and motors due to the lightweight, plastic housings typically used, which can lead to performance constraints and issues like electrical shorting and excessive heating.
Innovation Solution
A motor housing design featuring a metallic outer shell with a support cage made of rigid plastic that electrically and thermally insulates the electric motor, allowing it to be securely positioned in a spaced-apart relation within the shell, reducing the risk of electrical shorting and excessive heating while accommodating more powerful components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic outer shell is used to accommodate heavier and higher performing batteries and motors, then the structural integrity and support capability are improved, but the weight of the housing increases
Solution Approach 1:
The housing is segmented into multiple functional components: an outer shell providing structural integrity, an intermediate support cage providing mechanical support and spacing, and an inner motor assembly. This segmentation allows each component to be optimized for its specific function while sharing the load requirements.
Solution Approach 2:
The housing employs a composite structure combining metallic outer shell material for strength, rigid plastic or composite material for the support cage to provide insulation and mechanical support, and appropriate insulating materials between components. This composite approach achieves the required structural integrity while managing weight through material selection.
2Volume of moving object
If the electric motor is positioned closer to the outer shell to reduce housing size, then the device compactness is improved, but the risk of electrical shorting and excessive heating increases
Solution Approach 1:
An intermediate support cage structure is introduced between the electric motor and the outer shell. This intermediary component provides electrical insulation, thermal insulation, and mechanical spacing, preventing direct contact between conductive parts and the shell while maintaining compact overall dimensions.
Solution Approach 2:
The support cage creates three-dimensional spacing between the motor assembly and the outer shell, utilizing the available volume efficiently. This spatial arrangement maintains necessary insulation distances without simply increasing the housing dimensions in one direction.
3Power
If heavier batteries and motors are used to improve power output, then the power capability is improved, but the support and accommodation requirements increase
Solution Approach 1:
The support cage structure performs multiple functions simultaneously: it provides mechanical support for heavier components, maintains electrical insulation, provides thermal insulation, ensures proper spacing for heat dissipation, and facilitates assembly. This multi-functionality reduces the need for additional specialized support structures.
Solution Approach 2:
The support cage merges several required functions into a single integrated component structure, combining mechanical support, electrical insulation, and thermal management functions that would otherwise require separate elements, thereby managing complexity while supporting higher power 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
The solution enhances the structural integrity and insulation of the motor housing, enabling the use of more powerful batteries and motors, improving the performance and reliability of battery-powered string trimmers by preventing electrical shorting and excessive heating, thus overcoming the limitations of lightweight plastic housings.
Implementation Method 1
the support cage is adapted to support the electric motor in spaced-apart relation to the outermost shell and electrically insulate the motor from the outermost shell
Implementation Method 2
the support cage is adapted to support the electric motor in spaced-apart relation to the outermost shell and electrically insulate the motor from the outermost shell
Data Source
AI summary
An outdoor power equipment unit such as a string trimmer, and an electric motor support structure for use with the same. The structure may form a cage that surrounds the motor and secures the motor in place relative to an outermost shell of a motor housing of the string trimmer. The cage may electrically and/or thermally insulate the outermost shell from the motor.