Battery-Powered Wheelbarrow Dynamic Braking Transition Control
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Solution Overview
Problem
Existing battery-powered wheelbarrows with motor-driven wheels face challenges in properly controlling dynamic braking, which is either manually adjustable or controlled by a microcomputer, leading to instability in user operation.
Innovation Solution
A battery-powered wheelbarrow with a control circuit that activates and adjusts dynamic braking through a drive circuit, allowing for smooth transitions in braking force based on motor requirements and conditions, using a control circuit to manage dynamic braking activation and deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic braking is activated by short-circuiting motor windings, then braking force is generated to stop the wheelbarrow, but the transition from braking to movement may cause instability due to abrupt braking force changes
Solution Approach 1:
The patent applies dynamics by transitioning from static braking (on/off state) to dynamic braking (gradually decreasing braking force). The control circuit decreases the dynamic braking in accordance with a lapse of time after the drive requirement is satisfied, creating a smooth transition that maintains stability while improving usability.
Solution Approach 2:
The patent changes the parameter of braking force from a binary state (activated/not activated) to a continuously varying parameter. By controlling the drive circuit to decrease the dynamic braking gradually over time, the system achieves stable transitions that enhance both reliability and ease of operation.
2Ease of operation
If mechanical brake is manually adjusted, then user can control braking force, but manual adjustment may not provide stable and precise control compared to automated control
Solution Approach 1:
The patent replaces the manual mechanical brake adjustment system with an automated electronic control system. The control circuit automatically activates and decreases dynamic braking based on drive requirement signals, eliminating the need for manual adjustment while providing stable and precise control.
Solution Approach 2:
The control circuit uses feedback from the drive requirement signal to automatically adjust the braking force. When the drive requirement is satisfied, the control circuit activates dynamic braking; when not satisfied, it decreases the braking, creating a self-regulating system that improves control stability.
3Extent of automation
If dynamic braking is controlled by microcomputer, then automated control is achieved, but improper control may reduce system stability
Solution Approach 1:
The control circuit is designed to activate dynamic braking in advance when the drive requirement is satisfied, and to decrease the braking gradually over time. This preliminary and gradual action prevents abrupt changes that could destabilize the system, ensuring stable automated control.
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
The control circuit ensures stable and appropriate control of dynamic braking, reducing fluctuations in rotational speed and enabling safe operation by adjusting braking force according to motor conditions and user input.
Implementation Method 1
The drive circuit short-circuits at least two of the two or more terminals so as to activate a dynamic braking in the motor
Data Source
AI summary
One aspect of the present disclosure provides a battery-powered wheelbarrow including a battery housing, a motor, a wheel, a drive circuit, and a control circuit. The control circuit activates, during a drive requirement of the motor not being satisfied, dynamic braking. The control circuit decreases the dynamic braking through the drive circuit in accordance with a lapse of time in response to a first transition having occurred or occurring.