Push Mower Motor Circuit Isolation During Reverse Rolling
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Solution Overview
Problem
Existing push mowers experience abnormal conditions and potential damage due to motor energy discharge when the traveling motor rotates in reverse during backward dragging or when the mower is pushed forward, causing safety hazards and machine damage.
Innovation Solution
A push mower with a controller that controls the power supply circuit of the traveling motor to cut off or redirect motor energy generated by external force, using a circuit switch and relay to prevent energy transmission to other components, and includes features like energy storage and indicator lights to manage this energy safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the traveling motor is allowed to rotate freely in reverse during backward dragging or forward pushing, then the ease of operation is improved, but the reliability deteriorates due to motor energy discharge causing abnormal conditions or machine damage
Solution Approach 1:
The patent introduces a control board as an intermediary device between the traveling motor and the power supply circuit. This control board detects when the traveling motor rotates in reverse (generating motor energy) and automatically cuts off the power supply circuit to prevent harmful energy discharge. This intermediary mechanism allows the motor to rotate freely during backward dragging or forward pushing (maintaining ease of operation) while preventing reliability issues from uncontrolled energy discharge.
2Reliability
If the power supply circuit is continuously monitored and controlled to prevent motor energy discharge, then the reliability is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The control board is designed to automatically detect the rotation direction of the traveling motor and autonomously control the power supply circuit without requiring external intervention or complex monitoring systems. When the motor rotates in reverse, the control board self-activates to cut off power; when the motor rotates forward or is stationary, normal operation continues. This self-service approach improves reliability while minimizing device complexity by using a simple, autonomous control mechanism rather than elaborate monitoring and control systems.
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
Prevents abnormal operation and potential damage by managing motor energy generated during backward dragging or forward pushing, ensuring safer operation and reducing machine wear.
Implementation Method 1
The traveling motor is drivable by an external force to generate a motor energy
Data Source
Figure 1
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AI summary
A push mower includes a body including at least a traveling assembly, a traveling motor driving the traveling assembly, a cutting assembly, and a cutting motor driving the cutting assembly; a handle device connected to the body and including at least an operating member for a user to operate; a controller configured to control at least the working states of the traveling motor and the cutting motor; and a power interface for connecting a power supply energy capable of supplying power to at least the traveling motor and the cutting motor. The traveling motor is drivable by an external force to generate a motor energy. The controller is configured to, when the traveling motor generates the motor energy, cut off an electrical energy transmission path of the traveling motor.