Motor Brake Circuit for Stable Cart Braking Force Control
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Solution Overview
Problem
Existing cart technologies face challenges in stabilizing the magnitude of the braking force applied by motor brake circuits, leading to inconsistent braking performance.
Innovation Solution
Incorporating an electronically variable resistance element that operates in both linear and switching modes, allowing for precise adjustment of the braking force by controlling the current flowing through it, and using a comparator circuit to compare current command values with detected values for accurate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional motor brake circuits are used, then the structure is simple, but the magnitude of braking force cannot be stabilized
Solution Approach 1:
The patent applies the dynamics principle by using an electronically variable resistance element that can dynamically adjust its resistance value based on control signals. This allows the braking force magnitude to be stabilized through real-time adjustment of the resistance, enabling the system to adapt to varying operational conditions and maintain consistent braking performance.
Solution Approach 2:
The patent implements parameter changes by modifying the resistance value of the electronically variable resistance element. By changing the resistance parameter in response to control inputs, the circuit can precisely control the current flow and thereby stabilize the braking force magnitude applied to the motor.
2Measurement precision
If electronically variable resistance element is operated in switching mode, then energy efficiency improves, but braking force precision deteriorates
Solution Approach 1:
The patent applies the dynamics principle by enabling the electronically variable resistance element to operate in linear mode during braking operations. This dynamic operational mode selection allows for precise control of the resistance value, thereby achieving high precision in braking force adjustment while maintaining energy efficiency through optimized control strategies.
Solution Approach 2:
The patent implements parameter changes by adjusting the resistance value of the electronically variable resistance element in a controlled manner. By operating in linear mode with precise resistance modulation, the system achieves accurate braking force control while managing energy consumption through efficient parameter management.
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 enables precise adjustment and stabilization of the braking force, enhancing the stability and consistency of the braking performance of the cart.
Implementation Method 1
an electronically variable resistance element configured to operate in a linear mode and a switching mode in response to a control input signal
Data Source
AI summary
A cart may include: a driving wheel; a motor configured to rotate the driving wheel; a motor drive circuit configured to drive the motor; a motor brake circuit configured to electrically brake the motor; a rotation speed sensor configured to detect a rotation speed of the motor; and a control device configured to control the motor via the motor drive circuit and the motor brake circuit based on a target rotation speed of the motor and the rotation speed detected by the rotation speed sensor. The motor brake circuit may include an electronically variable resistance element configured to operate in a linear mode and a switching mode in response to a control input signal. The motor brake circuit may be configured to operate the electronically variable resistance element in the linear mode when braking the motor.