Multi-Brush Floor Assembly Motor Stall Detection With Dynamic Thresholds
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Solution Overview
Problem
Existing vacuum cleaners with multiple floor brushes face instability and safety hazards due to false or no protection against motor stalling, as different floor brushes have varying operating currents, leading to potential damage and safety risks.
Innovation Solution
A vacuum cleaner with a control unit and detection unit, including a floor brush current detection module that identifies the current passing through the electric motor, allowing the control unit to maintain or stop the motor's operation based on detected currents, ensuring accurate stall detection and prevention of motor burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed over-current point is used to determine motor stall state, then the protection threshold is simple to set, but false protection occurs for large-current motors and no protection occurs for small-current motors
Solution Approach 1:
The patent changes the protection threshold from a fixed value to a dynamic value that adapts to different motor types. By detecting the start peak current and comparing it with pre-stored correspondence relationships, the system determines the appropriate stall current threshold specific to each motor, thereby eliminating false protection for large-current motors and ensuring proper protection for small-current motors.
Solution Approach 2:
The patent performs preliminary detection of the start peak current when the motor first starts, before normal operation begins. This preliminary action allows the system to identify the motor type and establish the correct protection threshold in advance, ensuring accurate stall protection is in place before any stall condition can occur.
2Adaptability or versatility
If different floor brushes with different operating currents are used, then cleaning functionality is improved, but motor stall protection becomes unreliable
Solution Approach 1:
The system performs preliminary detection of the start peak current when each floor brush motor starts, before normal operation. This preliminary action identifies the specific motor type and retrieves the corresponding stall current threshold from pre-stored data, ensuring that each motor has its own accurate protection threshold established before operation begins.
Solution Approach 2:
The protection threshold parameter is changed from a fixed universal value to a dynamic value that varies according to the specific floor brush motor being used. The system detects the start peak current, matches it with pre-stored correspondence relationships, and determines the appropriate stall current threshold, thereby adapting the protection parameter to each different motor type.
Data Source
AI summary
A vacuum cleaner and a control method thereof, wherein the vacuum cleaner includes a vacuum cleaner body, a floor brush assembly, and an extension tube connecting the two together. The floor brush assembly comprises a plurality of different floor brushes for performing different cleaning work. The vacuum cleaner is further provided with a control unit and a detection unit. The detection unit comprises a floor brush current detection module for detecting current passing through an electric motor in a floor brush. The floor brush current detection module sends detection signals to the control unit, and the control unit controls the electric motor to maintain an operating state or stop the operating state according to the detection signals.