Vacuum Cleaner Drive Assist With Freewheeling Motor Control
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Solution Overview
Problem
Existing vacuum cleaners require manual effort to propel the base over the floor, and existing motor systems resist external forces that increase wheel speed beyond the target speed, making them inefficient and difficult to maneuver.
Innovation Solution
A vacuum cleaner with a motor and controller system that assists propulsion by rotating the rear wheels based on the force applied to the handle, featuring a driving mode that powers the motor to maintain target speed and a non-driving mode allowing freewheeling, reducing electromagnetic resistance and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is configured to electromagnetically resist external forces that increase wheel speed beyond target speed, then the motor can maintain controlled speed and prevent runaway rotation, but the motor creates resistance that makes the vacuum cleaner difficult to maneuver and reduces ease of operation
Solution Approach 1:
The motor controller dynamically adjusts its electromagnetic resistance based on operating conditions. During normal operation, the motor provides controlled resistance to maintain target speed. During manual maneuvering, the controller reduces or eliminates electromagnetic resistance to allow easy movement. This dynamic adjustment resolves the contradiction between speed control reliability and ease of operation.
Solution Approach 2:
The system changes the electromagnetic parameter (electromagnetic resistance) of the motor based on operational mode. By adjusting the motor's electromagnetic characteristics, the system can switch between providing speed control resistance and providing minimal resistance for manual maneuvering, thus resolving the contradiction between maintaining controlled speed and enabling easy maneuverability.
2Productivity
If the motor continuously powers the drive wheel to assist propulsion, then user effort is reduced and productivity increases, but energy consumption increases and use of energy worsens
Solution Approach 1:
The motor operates periodically rather than continuously, activating only when propulsion assistance is needed based on detected user effort or operational conditions. During periods when manual propulsion is sufficient or when the vacuum cleaner is being maneuvered, the motor remains inactive. This periodic operation maintains productivity benefits while significantly reducing overall energy consumption.
Solution Approach 2:
The vacuum cleaner's drive system serves itself by automatically activating the motor only when assistance is needed, based on sensors detecting user effort or wheel speed conditions. The system self-regulates its energy consumption by monitoring operational requirements and activating the motor only when necessary, thus maintaining productivity while minimizing energy use.
3Power
If the coupling mechanism uses a high gear ratio to reduce motor speed and increase torque, then the motor can effectively drive the wheels, but the shaft must rotate many times for each wheel rotation, increasing device complexity
Solution Approach 1:
The coupling mechanism is segmented into discrete, modular components with a gear ratio less than 10:1. This segmentation allows for simpler individual components while achieving sufficient torque multiplication for the application. The modular approach reduces overall complexity compared to high-ratio continuous gearing systems.
Solution Approach 2:
The system changes the gear ratio parameter to be less than 10:1, optimizing the balance between torque multiplication and rotational speed. This parameter optimization reduces the complexity of the coupling mechanism while maintaining adequate power transmission capability for driving the vacuum cleaner wheels.
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
Enhances user convenience by providing efficient propulsion assistance while minimizing resistance to external forces, allowing easier maneuverability and reduced effort in moving the vacuum cleaner.
Implementation Method 1
A motor has an output shaft coupled to the drive wheel
Implementation Method 2
The motor is configured, in the driving mode of the controller, not to electromagnetically resist an external force urging the drive wheel to rotate faster than the target speed
Data Source
AI summary
A base has wheels, including a drive wheel, for wheeling the base over a floor. A handle, including a handgrip, is connected to the base for propelling the base by manually applying a force to the handgrip. A motor has an output shaft coupled to the drive wheel. A controller has different operative modes. They include a driving mode in which the controller powers the motor to rotate the drive wheel in a direction corresponding to a direction of the force applied to the handle, and a non-driving mode in which the controller refrains from powering the motor to rotate the drive wheel while a user grasps and applies force to the handgrip to propel the base.