Handheld Vacuum Floor-Brush Reversal for Motor Overload Control
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Solution Overview
Problem
Existing vacuum cleaners, particularly handheld models, struggle to effectively clean surfaces with varying textures, such as long-haired carpets, without overloading the electric motors due to increased mechanical resistance and airflow obstruction, leading to potential shutdowns and user inconvenience.
Innovation Solution
A control unit detects excessive load on the electric motors and reverses the rotation direction of the floor brush motor to reduce torque and prevent overload, while adjusting the brush's bristle orientation and speed to adapt to different surfaces, using brushless motors for enhanced performance and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the floor brush operates at high speed to improve cleaning effectiveness on carpets, then cleaning performance is improved, but the mechanical resistance and load on the motor increase significantly
Solution Approach 1:
The patent applies dynamics by making the brush rotation speed adjustable rather than fixed. The control unit dynamically adjusts the rotation speed of the floor brush based on detected surface characteristics - higher speeds for hard floors to maximize cleaning effectiveness, and reduced speeds for carpets to prevent motor overload while maintaining adequate cleaning performance
Solution Approach 2:
The patent changes the operational parameters of the floor brush motor by implementing variable speed control. The control unit modifies the rotation speed parameter according to the detected surface type, allowing the system to optimize between cleaning effectiveness and motor load prevention across different surface conditions
2Ease of manufacture
If the vacuum cleaner uses a brushed motor for the floor brush to reduce cost, then manufacturing cost is reduced, but the motor has shorter service life due to wear of brushes and commutators
Solution Approach 1:
The patent substitutes the mechanical brush-commutator contact system with a brushless motor design. This replacement eliminates the wear-prone mechanical contacts (brushes and commutators) while maintaining the motor's rotational function, thereby significantly extending service life and reliability without substantially increasing manufacturing cost
3Productivity
If the vacuum cleaner operates on long-haired carpets, then cleaning capability is tested, but the airflow is significantly obstructed and the fan motor becomes overloaded
Solution Approach 1:
The patent implements feedback by using the control unit to detect operational conditions such as motor load and airflow resistance. When the system detects high resistance conditions typical of long-haired carpets, the control unit responds by adjusting the fan motor speed or brush speed to prevent overload, creating a closed-loop control system that maintains reliable operation across varying surface conditions
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
Enables continuous and effective cleaning on diverse surfaces by preventing motor overload, maintaining airflow, and extending the vacuum's operational life, all while being cost-effective and energy-efficient.
Implementation Method 1
a fan (12) with an impeller for generating an air flow
Implementation Method 2
Brushless electric motors also typically have higher performance than brushed motors
Data Source
Figure 1~2
AI summary
The invention relates to a vacuum cleaner (1), preferably a handheld vacuum cleaner (1), comprising a blower (12) with an impeller for generating an airflow, a first electric motor (12a) for driving the impeller of the blower (12), a suction nozzle (14) with a rotatable brush (15), a second electric motor (15a) for driving the rotatable brush (15), and a control unit (17) which is designed and configured to operate at least the first electric motor (12a) and/or the second electric motor (15a). The vacuum cleaner (1) is characterized in that the control unit (17) is designed and configured to detect an impermissibly high load on the first electric motor (12a) and/or the second electric motor (15a) and, in response, to switch the operation of the second electric motor (15a) from a first direction of rotation to a second direction of rotation.