Wheelbarrow Electromagnetic Brake Control Against False Release
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Solution Overview
Problem
Existing electric-powered wheelbarrows with electromagnetic power-off brakes face issues with improper control of the braking system, leading to unintentional deactivation due to faulty control signals, which can result in unsafe operation.
Innovation Solution
An electric-powered wheelbarrow with a control circuit that outputs first and second control signals to properly manage the electromagnetic brake, ensuring it is only deactivated when both signals are received, and a signal-processing circuit that delivers excitation current to the electromagnetic coil to maintain reliable braking control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electromagnetic power-off brake is used to brake the wheel when electric power is not supplied, then the braking function is activated, but the brake may be unintentionally deactivated due to improper control of electric power supply
Solution Approach 1:
The control circuit requires preliminary satisfaction of multiple conditions (first control signal indicating brake activation needed, second control signal indicating wheel speed below threshold) before deactivating the brake. This preliminary verification prevents unintentional deactivation while maintaining simple electromagnetic brake operation.
Solution Approach 2:
The control circuit uses feedback from wheel speed detection to dynamically control the electromagnetic brake. The second control signal is generated based on real-time wheel speed feedback, ensuring the brake is only deactivated when appropriate speed conditions are met, thus improving reliability without complicating operation.
2Ease of operation
If the electromagnetic brake is deactivated by supplying electric power to the electromagnetic coil, then the braking force is released, but faulty control signals may cause improper deactivation
Solution Approach 1:
Before deactivating the electromagnetic brake by supplying power to the coil, the control circuit performs preliminary checks to ensure both the first control signal (brake activation requirement) and second control signal (wheel speed condition) are satisfied. This prevents improper deactivation while maintaining responsive brake activation.
Solution Approach 2:
The system uses real-time feedback from the wheel speed detection circuit to generate the second control signal. This feedback mechanism ensures that brake deactivation only occurs when wheel speed conditions are appropriate, improving deactivation accuracy without compromising activation responsiveness.
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 solution ensures proper control of the electromagnetic brake, reducing unintentional deactivation and enhancing safety by requiring simultaneous receipt of control signals for deactivation, thus improving the reliability of the braking system.
Implementation Method 1
The electromagnetic brake includes an electromagnetic coil. The electromagnetic coil receives an excitation current to thereby be energized.
Implementation Method 2
The electromagnetic brake is activated to apply a braking force to the wheel in response to the electromagnetic coil being de-energized
Data Source
AI summary
An electric-powered wheelbarrow in one aspect of the present disclosure includes a motor, a wheel, an electromagnetic brake, a control circuit, a signal-processing circuit, and a drive circuit. The electromagnetic brake includes an electromagnetic coil. The electromagnetic brake (i) applies a braking force to the wheel in response to the electromagnetic coil being de-energized and (ii) releases the braking force from the wheel in response to the electromagnetic coil being energized. The control circuit outputs a first control signal and a second control signal. The signal-processing circuit receives the first and second control signals to thereby output a deactivating signal. The drive circuit receives the deactivating signal and delivers an excitation current to the electromagnetic coil.