Fan Motor Cooling Flow Path for High-Suction Heat Control
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Solution Overview
Problem
Conventional fan motors for handheld vacuum cleaners face challenges in balancing high suction power with reduced size and weight, often resulting in increased noise, vibration, and heat generation due to high-speed rotation, which complicates cooling and reduces suction efficiency.
Innovation Solution
A fan motor structure with a cooling flow path that minimizes airflow resistance and uses external air for cooling, featuring a diffuser made of synthetic resin and a metallic motor housing to support high-speed rotation, allowing efficient heat dissipation without diverting motor power from suction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fan motor rotates at high speeds to increase power and reduce size, then the suction capability is improved, but noise, vibration and heat generation increase
Solution Approach 1:
The patent converts the harmful heat generated by high-speed rotation into a beneficial cooling mechanism by designing a cooling flow path that utilizes this heat-driven air flow to cool the motor part, transforming the harmful thermal effect into a useful cooling function
Solution Approach 2:
The patent introduces a cooling flow path as an intermediary system that mediates between the heat-generating motor part and the surrounding environment, allowing heat dissipation without directly impacting the suction capability through separate flow paths
2Stability of the object's composition
If a metal-based frame structure is used to support the rotating shaft for high-speed rotation, then vibration is reduced, but the weight of the fan motor increases
Solution Approach 1:
The patent employs a composite structure combining metal-based components for the motor housing and frame with synthetic resin components for the diffuser and flow path elements, achieving both the rigidity needed for high-speed rotation and weight reduction for portability
3Temperature
If air flow is used to directly cool the fan motor, then heat dissipation is improved, but the flow resistance at the exhaust side increases which deteriorates suction force
Solution Approach 1:
The patent segments the air flow paths into distinct cooling flow paths and suction flow paths, allowing independent optimization of each function - the cooling flow paths draw air from the rear end of the impeller for motor cooling, while the suction flow paths maintain optimal flow characteristics for suction capability
Solution Approach 2:
The patent applies different flow path characteristics to different regions of the motor housing - the cooling flow paths are designed with specific inlet and outlet positions that utilize the rear end air flow, while the main suction flow paths maintain streamlined characteristics, creating locally optimized flow conditions for each function
4Weight of moving object
If the size of the motor housing is reduced to minimize weight, then portability is improved, but heat dissipation becomes less efficient
Solution Approach 1:
The patent implements a nested cooling flow path structure where the cooling air flow is integrated within the compact motor housing, with cooling inlets positioned at the rear end and outlets at the front, creating an efficient heat dissipation system within the minimized housing volume
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 design maximizes suction power and efficiency while reducing the motor's size and weight, minimizing power loss for cooling and simplifying manufacturing, by using external air pressure for cooling and synthetic resin components for airflow guidance.
Implementation Method 1
A cooling flow path inlet introduced into the motor mount to cool the motor part, and a cooling flow path outlet provided at the motor mount
Implementation Method 2
Air pressurized by the impeller is discharged through an air discharge opening out of the motor mount
Implementation Method 3
A guide shape is provided in the motor mount to direct air introduced into the motor mount toward the motor part
Data Source
AI summary
A fan motor comprises a motor mount, a motor part accommodated in an inner space of the motor mount, and an impeller disposed above the motor mount. The motor mount defines: an air discharge opening configured to discharge air discharged from the impeller to an outer space of the motor mount; a cooling flow path outlet disposed at the upper side of the motor mount at a position between the impeller and the air discharge opening; and a first cooling flow path inlet disposed at a position below the air discharge opening and the cooling flow path outlet. The fan motor further includes a guide that is configured to direct, to an upward direction, at least a portion of air that is discharged through the air discharge opening and introduced to the inner space through the first cooling flow path inlet.