Power Unit High Power-to-Weight Ratio Thermal Management
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Solution Overview
Problem
Existing power units for garden and outdoor power execution devices face challenges in achieving a compact structure while outputting high power, with issues related to volume, weight, and heat dissipation.
Innovation Solution
A power unit design that includes a housing with a motor, power supply assembly, and control assembly, optimized for a power output range of 1500 W to 5500 W, with a mass range of 8 kg to 14.5 kg, featuring a power-to-weight ratio of 103.5 W/kg to 687.5 W/kg, and advanced heat dissipation mechanisms using multiple fans and airflow paths to maintain efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power unit outputs high power (1500-5500 W), then the power output is improved, but the volume and weight increase
Solution Approach 1:
The power unit is divided into modular components including a motor assembly, power supply assembly, control assembly, and housing, allowing independent optimization of each module's volume and weight while maintaining overall high power output capability
Solution Approach 2:
The control assembly is disposed within the motor assembly, and the power supply assembly is integrated with the housing structure, creating a nested arrangement that reduces overall volume while maintaining high power output
2Power
If the power unit outputs high power (1500-5500 W), then the power output is improved, but the weight increases
Solution Approach 1:
The housing combines metal materials for structural strength with plastic materials for weight reduction, achieving optimal balance between power output capability and overall mass
Solution Approach 2:
The power supply assembly is designed as a separate modular component that can be independently optimized for weight, allowing the motor assembly to focus on power generation while the power supply handles energy storage
3Power
If multiple components are combined in the power unit, then the power output capability is improved, but the heat dissipation becomes more difficult
Solution Approach 1:
The control assembly is extracted as a separate component from the motor assembly, allowing independent thermal management for each component and preventing heat accumulation in concentrated areas
Solution Approach 2:
The connection surface is designed to obliquely intersect with the preset plane, creating three-dimensional heat dissipation pathways that extend heat away from the motor in multiple spatial directions
4Volume of moving object
If the connection surface is designed to obliquely intersect with the preset plane, then the structural compactness is improved, but the manufacturing complexity increases
Solution Approach 1:
The housing structure incorporates adjustable and detachable components, particularly in the power supply assembly mounting, allowing the complex oblique connection surfaces to be manufactured as separate modules and assembled rather than as a single complex piece
Data Source
AI summary
A power unit is configured to be connected to a garden or outdoor power execution device and includes a housing, a motor, and a control assembly. The housing is formed with an accommodation space. The motor is at least partially disposed in the accommodation space. The control assembly is used for controlling the motor. Maximum output power P of the motor is greater than or equal to 1500 W and less than or equal to 5500 W, a mass M1 of the power unit is greater than or equal to 8 kg and less than or equal to 14.5 kg, and a ratio of the maximum output power P to the mass M1 is higher than or equal to 103.5 W/kg and lower than or equal to 687.5 W/kg.