Vacuum Cleaner Brush Load Control for Motor Protection
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Solution Overview
Problem
Vacuum cleaners face challenges in adaptively controlling the motor operation based on varying loads applied to the drum-mounted brush, leading to inefficient suction and potential motor damage due to inconsistent current supply.
Innovation Solution
A vacuum cleaner system that includes a processor to sense the load applied to the motor and adjust the speed of both the drum motor and suction motor based on threshold values, reducing speed or terminating operation when high loads are detected to prevent damage and optimize suction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor speed is increased to improve suction performance, then cleaning efficiency is improved, but the motor load increases causing potential damage
Solution Approach 1:
The motor speed is made dynamically adjustable based on detected load conditions. The processor continuously monitors motor current and adjusts the drum motor speed accordingly - increasing speed when load is low for better cleaning efficiency, and reducing speed when load exceeds thresholds to protect motor reliability.
Solution Approach 2:
A feedback control system is implemented where the processor monitors motor current in real-time and uses this information to adjust motor speed. The system compares detected current against predetermined thresholds and dynamically modifies operating parameters to balance cleaning performance with motor protection.
2Power
If the motor operates at high speed continuously to maintain suction power, then cleaning performance is maintained, but energy consumption increases
Solution Approach 1:
The motor operates in periodic cycles of high and low speed based on cleaning conditions. Rather than maintaining constant high speed, the system alternates between high-power modes during high-resistance surfaces and lower-power modes during low-resistance surfaces, reducing overall energy consumption while maintaining effective cleaning.
Solution Approach 2:
The system dynamically changes motor operating parameters (speed, power) based on detected cleaning conditions. By adjusting motor speed according to surface resistance and load conditions, the system optimizes the balance between maintaining sufficient suction power and minimizing energy consumption.
3Productivity
If the brush drum speed is increased to improve cleaning of high-resistance surfaces, then cleaning effectiveness is improved, but the load on the motor increases
Solution Approach 1:
The drum motor speed is dynamically adjusted based on real-time detection of motor load and cleaning conditions. The system increases speed when high-resistance surfaces are detected to maintain cleaning effectiveness, and reduces speed when motor load becomes excessive to prevent damage.
Solution Approach 2:
The control system uses feedback from motor current detection to regulate drum speed. When the processor detects that motor current exceeds predetermined thresholds, it reduces drum speed to lower motor load, while still maintaining adequate cleaning performance through adaptive control.
Data Source
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AI summary
Disclosed is a vacuum cleaner. The present vacuum cleaner includes a drum mounted with a brush, a first motor for rotating the drum, a sensor for sensing a load applied to the first motor, a second motor generating suction pressure, and a processor for controlling at least one from the first motor and the second motor according to a size of a load sensed from the sensor.