Electric Blower Dual Air Path Cooling for Sensor Stability
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Solution Overview
Problem
The heat generated by coils in motor-driven electric blowers causes deformation of sensor-holding members, leading to positional displacement of sensors, which is not effectively addressed by existing heat dissipation characteristics.
Innovation Solution
The design incorporates a dual air path system where airflow generated by the moving blade is guided through both an external and internal air path, enhancing heat dissipation and preventing sensor displacement due to thermal deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor-equipped single-phase motor is used with the sensor mounted on the stator, then the motor can detect rotational position of the rotor, but heat generated by coils causes deformation of the sensor-holding member and positional displacement of the sensor
Solution Approach 1:
The patent divides the air flow path into two separate channels: a first air path that bypasses the motor and a second air path that passes through the motor. This segmentation allows different air flows to serve different functions - one for cooling and one for exhaust, preventing heat from affecting the sensor while maintaining detection accuracy
Solution Approach 2:
The patent introduces an air guiding member as an intermediary component that directs air flow between the moving blade and the stationary blade. This member helps channel air through the second air path past the motor, enabling heat dissipation without interfering with sensor operation or motor function
2Power
If the motor operates with coils generating heat, then the motor can drive the moving blade, but heat dissipation characteristics are insufficient causing thermal deformation
Solution Approach 1:
The patent converts the harmful heat generated by the motor coils into a beneficial cooling effect by directing air flow through the second air path. The air absorbs heat from the motor as it passes through, and this heated air is then expelled through the exhaust port, effectively using the heat generation as a driver for the cooling system
Solution Approach 2:
The patent employs pneumatic principles by using air flow as the cooling medium. The moving blade generates air flow that is channeled through the second air path, utilizing fluid dynamics to remove heat from the motor without requiring additional mechanical cooling 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
This solution effectively dissipates heat generated by the motor, preventing sensor positional displacement and enhancing the reliability of the electric blower by improving heat dissipation characteristics.
Implementation Method 1
heat generated by the motor can be dissipated by the air flowing through the second air path
Data Source
Figure 1~2
Figure 3(A)~4
Figure 5~6
AI summary
An electric blower includes a motor including a rotor having a rotation shaft, a stator provided to surround the rotor, and a sensor mounted on the stator and facing the rotor, a moving blade mounted at one end side of the rotation shaft in an axial direction of the rotation shaft, a frame housing the stator and having a hole on a side facing to the moving blade, a first air path outside the frame, a second air path inside the frame, and an air guide member for guiding an airflow generated by the moving blade to the second air path.