Lawn Mower Robot Drive Wheel Motor Integration
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Solution Overview
Problem
Existing lawn mower robots lack efficient and reliable movement systems, impacting their mobility and maneuverability, especially in varying terrain and obstacle encounters.
Innovation Solution
The lawn mower robot incorporates a compact movement system with a rotation motor integrated inside an adjustable drive wheel and an orientation motor to control wheel direction, allowing for axial rotation and trajectory adjustment, along with measuring means to monitor and correct movement parameters, ensuring efficient navigation and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotation motor is integrated inside the drive wheel, then the movement system becomes more compact and the motor is protected from damage, but the device complexity increases
Solution Approach 1:
The rotation motor is integrated inside the drive wheel, with the motor housing forming part of the wheel structure. The motor shaft is directly coupled to the wheel hub, creating a nested configuration where the motor is housed within the wheel assembly. This eliminates the need for external motor mounts and transmission components, reducing overall volume while containing multiple functional elements within a compact integrated structure.
2Adaptability or versatility
If the orientation motor is mounted on the frame to steer the wheel, then the maneuverability is improved, but the device complexity increases
Solution Approach 1:
The movement system is segmented into two independent functional modules: a rotation motor integrated in the drive wheel for axial rotation and forward movement, and a separate orientation motor mounted on the frame for steering control. This segmentation allows each motor to specialize in one degree of freedom, improving maneuverability through independent control of rotation and orientation, while the modular design helps manage system complexity by separating functional responsibilities.
3Measurement precision
If measuring means are added to monitor and correct movement parameters, then the trajectory following precision is improved, but the device complexity increases
Solution Approach 1:
Measuring means are integrated into the movement system to detect actual movement parameters such as wheel rotation angle and orientation. These measurements are fed back to the control unit, which compares the detected parameters with the planned trajectory and generates correction commands for the rotation and orientation motors. This closed-loop feedback system improves trajectory following precision by continuously monitoring and adjusting movement parameters, while the integration of sensors into existing structural elements helps manage the added complexity.
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
This configuration enhances the robot's mobility and maneuverability, protecting the motors from damage and allowing for efficient operation on uneven surfaces and varying cutting heights, while ensuring precise trajectory following and obstacle navigation.
Implementation Method 1
a rotation motor located at least partly inside the containment space and configured to control the axial rotation of the wheel
Implementation Method 2
an orientation motor mounted on the frame to orient the wheel in a predetermined direction
Data Source
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AI summary
Described is a lawn mower robot comprising: - a frame (2); - cutting means (3) configured for cutting grass, adjusting the height; - movement means (4) associated with the frame (2) for moving it along a working trajectory; wherein said movement means (4) comprise at least one movement module (5) comprising: - an adjustable drive wheel (6) defining internally a containment space; - a rotation motor (7a) positioned at least partly inside the containment space and configured for controlling an axial rotation, about a respective axis (X) of rotation, of the adjustable drive wheel (6) to allow a rolling of the wheel (6) on the grass; - a shaft (8) for orientation of the wheel (6), rotatably supported by said frame (2) rotating about an orientation axis (Y) at right angles to the axis (X) of rotation of the adjustable drive wheel (6) and supporting the adjustable drive wheel (6) and the rotation motor (7a), - an orientation motor (7b) supported by the frame (2) and operatively connected to the orientation shaft (8) for rotating and orienting said adjustable drive wheel (6), rotating it abut said orientation axis (Y), in a predetermined direction.