Bathroom Ventilator Soft-Start Impeller for Low-Noise Airflow
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Solution Overview
Problem
Conventional bathroom ventilators lack soft-start functionality, leading to noise discomfort, high inrush current, voltage spikes, and vulnerability to water and dust contamination, resulting in reduced reliability and increased power consumption.
Innovation Solution
A bathroom ventilator with a soft-start function, utilizing an AC/DC converter and a control module with a micro control unit to gradually increase motor speed, a baffle for airflow management, and a closed circuit board compartment for waterproofing, and an impeller design with a high blade count for reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bathroom ventilator is switched on from still state to full speed state immediately, then the ventilator can quickly remove bad smell or moisture, but the noise will make the user feel uncomfortable and cause inrush current, voltage spike or spike noise
Solution Approach 1:
The control module performs preliminary action by gradually increasing the motor speed from zero to full speed through a soft-start process. The control module adjusts the motor operating parameters in stages, allowing the impeller to accelerate progressively rather than instantly reaching full speed, thereby reducing noise and electrical spikes while still achieving full air removal capacity.
Solution Approach 2:
The system transitions from static to dynamic operation through controlled speed variation. The control module dynamically adjusts the motor speed based on operational stage, enabling the ventilator to adapt its performance characteristics during startup and operation, balancing productivity gain with noise and electrical stability requirements.
2Device complexity
If the AC motor is used directly with AC power supply, then the ventilator can operate simply, but the power consumption is relatively more energy
Solution Approach 1:
The system replaces direct AC motor operation with a DC brushless motor controlled by electronic circuitry. The AC/DC conversion module converts AC power to DC, and the control module electronically commutates the motor phases, substituting mechanical commutation with electronic control to achieve lower power consumption and softer startup characteristics.
Solution Approach 2:
The control module changes the motor operating parameters by adjusting the commutation timing and phase currents. By optimizing these electrical parameters through electronic control, the system achieves more efficient motor operation with reduced power consumption compared to direct AC motor operation.
3Device complexity
If the motor and coil are directly exposed without waterproof mechanism, then the structure is simple, but the motor and coil will be contaminated by dust or water causing dangerous voltage
Solution Approach 1:
The circuit board is nested within the sealed motor housing, and the motor assembly is nested within the ventilator housing with integrated waterproof seals. This nested arrangement with the DC brushless motor's inherent sealed structure protects the electronic components from dust and water contamination, ensuring reliability without adding complex external waterproofing mechanisms.
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 reduces noise, prevents inrush current and voltage spikes, enhances product reliability, extends lifespan, and decreases power consumption while maintaining a waterproof and low-noise operation.
Implementation Method 1
when an AC power is input to the first circuit board to be converted, a DC power is output to drive the drive device
Implementation Method 2
an impeller coupled to the drive device and driven by the drive device
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A ventilator includes a base, a drive device disposed on the base, an impeller coupled to the drive device and driven by the drive device, and a cover assembled with the base to define a closed area between the cover and the base for receiving a first circuit board therein, wherein when an AC power source is input to the first circuit board to be converted, a DC power source is output to drive the drive device.