Motor Case Fin Duct Cooling for Continuous Electric Work Machines
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Solution Overview
Problem
Existing electric work machines face challenges in appropriately driving the motor when it generates heat, leading to potential malfunctions and reduced performance.
Innovation Solution
The electric work machine incorporates a motor with a stator and rotor, an output unit, heat-radiating fins, a motor case, a cooling fan, and a duct that guides air through the cooling fan to the fin passages between heat-radiating fins, enhancing heat dissipation and motor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor operates continuously, then productivity is improved, but heat generation increases causing motor malfunction
Solution Approach 1:
The patent converts the harmful heat generated by motor operation into a beneficial cooling effect by using the motor's own rotational energy to drive a cooling fan. The fan forces air through the heat-radiating fins, transforming the waste heat into a driving force for the cooling system, thereby enabling continuous operation without thermal damage
Solution Approach 2:
The motor serves itself by using its rotational output to drive the cooling fan through the rotor shaft connection. This self-cooling mechanism eliminates the need for an external power source for the fan, allowing the motor to autonomously manage its thermal conditions during continuous operation
2Temperature
If heat-radiating fins are added to the motor case, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent merges the heat-radiating fins directly with the motor case, creating an integrated structure where the case serves both as the motor housing and as the heat dissipation component. This integration eliminates separate cooling components and reduces overall structural complexity while maintaining effective heat radiation
Solution Approach 2:
The motor case acquires multiple functions: it serves as the structural housing for the motor components and simultaneously as the heat-radiating surface. The fins attached to the case extend its functionality to include active heat dissipation, reducing the need for additional dedicated cooling structures
3Temperature
If a cooling fan is installed outside the motor case, then cooling effectiveness is improved, but ease of operation deteriorates due to exposed moving parts
Solution Approach 1:
The cooling fan is nested within the duct structure that is attached to the motor case, creating a layered configuration where the fan is enclosed by the duct. This nesting arrangement allows the fan to maintain its cooling effectiveness while being protected from direct user contact, thus improving safety without compromising performance
4Temperature
If a duct with guide is used to direct air through the cooling fan, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The duct is segmented into functional sections: an inlet portion, a guide portion with airflow directing guides, and an outlet portion. This segmentation allows each section to be optimized for its specific function while maintaining overall simplicity, with the guide portion specifically designed to efficiently direct air onto the heat-radiating fins without requiring complex internal structures
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 configuration allows for efficient cooling of the motor, reducing the risk of malfunctions due to heat and ensuring appropriate driving performance of the electric work machine.
Implementation Method 1
a cooling fan located outside the motor case and rotatable by the rotor shaft; and a duct including a guide to guide air through the cooling fan to a fin passage between adjacent heat-radiating fins
Implementation Method 2
a plurality of heat-radiating fins; a motor case having an outer surface receiving the plurality of heat-radiating fins
Implementation Method 3
a fin passage between adjacent heat-radiating fins of the plurality of heat-radiating fins
Data Source
AI summary
An electric work machine is driven appropriately. An electric work machine includes a motor including a stator, a rotor rotatable relative to the stator, and a rotor shaft fixed to the rotor, an output unit drivable by the rotor shaft, a plurality of heat-radiating fins, a motor case having an outer surface receiving the plurality of heat-radiating fins and accommodating the stator and the rotor, a cooling fan located outside the motor case and rotatable by the rotor shaft, and a duct including a guide to guide air through the cooling fan to a fin passage between adjacent heat-radiating fins of the plurality of heat-radiating fins.