Outer-Rotor Motor Stator Base Cooling for Coil Heat Dissipation
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Solution Overview
Problem
Existing electric work machines with outer rotor type motors face challenges in effectively dissipating the heat generated by the coils.
Innovation Solution
The electric work machine incorporates a stator base with heat dissipation fins and a heat dissipation member made of metal, which is in contact with the stator core to efficiently dissipate the heat generated by the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If drive current is supplied to the coils, then the motor generates power, but the coils generate heat that needs to be dissipated
Solution Approach 1:
The patent introduces a heat dissipation fin as an intermediary component between the coil and the external environment. The fin is thermally coupled to the coil through the insulator and provides an extended surface area for heat transfer to the surrounding air, thereby mediating the heat dissipation process without interfering with the motor's power generation function.
Solution Approach 2:
The patent adds a spatial dimension to heat dissipation by extending the heat dissipation fin in the radial direction outward from the stator core. This dimensional extension creates additional surface area for heat exchange with the environment, transforming the heat dissipation from a point-source problem to a distributed surface-based solution.
2Temperature
If heat dissipation fins are added to the stator base, then heat dissipation efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent merges the heat dissipation fin structure with the stator base by fixing the fin to the stator base. This integration combines two previously separate functions (structural support and heat dissipation) into a single unified component, reducing the overall number of parts and simplifying the device structure while maintaining effective heat dissipation.
3Temperature
If a metal heat dissipation member is added to face the stator core, then heat dissipation capability is enhanced, but the device complexity increases
Solution Approach 1:
The patent combines the metal heat dissipation member with the existing stator base structure, creating an integrated heat dissipation system. The metal member is positioned to face the stator core and is thermally coupled to it, providing enhanced heat dissipation capability while being structurally integrated rather than added as a separate component.
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 effectively dissipates heat from the coils, preventing excessive temperature rise and improving the performance and reliability of the motor.
Implementation Method 1
a stator base including a first heat dissipation fin and supported by the stator core
Implementation Method 2
heat dissipation fin... heat dissipation member made of metal and configured to face an end surface of the stator core
Data Source
AI summary
An electric work machine includes a stator including a stator core, an insulator fixed to the stator core, and a coil mounted on the insulator, a rotor at least a part of which is disposed on an outer circumferential side of the stator, the rotor including a magnet, a stator base including a first heat dissipation fin and supporting the stator core, and an output unit driven by the rotor.