Cart Brake Circuit Temperature Feedback for Speed Limiting
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Solution Overview
Problem
The motor brake circuit in carts can reach excessively high temperatures during braking, leading to potential operational failures due to heat generation, and existing solutions do not effectively manage this issue.
Innovation Solution
Incorporating a temperature sensor to detect when the motor brake circuit exceeds a predetermined temperature, the control device reduces the upper limit traveling speed from a first to a second lower speed, thereby reducing heat generation and preventing excessive temperature buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor brake circuit operates at high speed to maintain productivity, then the upper limit traveling speed is maintained, but the motor brake circuit reaches excessively high temperature causing operational failure risk
Solution Approach 1:
The control device continuously monitors the temperature of the motor brake circuit via a temperature sensor and adjusts the upper limit traveling speed based on the detected temperature. When the temperature exceeds a predetermined threshold, the control device automatically reduces the upper limit traveling speed to decrease heat generation, creating a closed-loop feedback system that balances productivity with thermal management
Solution Approach 2:
The system dynamically changes the operating parameter (upper limit traveling speed) based on the thermal state of the motor brake circuit. By adjusting the speed parameter in response to temperature conditions, the system optimizes the balance between maintaining productivity and preventing excessive temperature rise that could lead to operational failure
2Reliability
If the motor brake circuit is used for frequent braking operations, then the cart can maintain control at high speeds, but the generated heat quantity increases causing the motor brake circuit to reach excessively high temperature
Solution Approach 1:
The temperature sensor provides continuous feedback on the motor brake circuit temperature, enabling the control device to monitor the thermal state during braking operations. This feedback mechanism allows the system to detect when frequent braking is causing excessive heat accumulation and respond by adjusting the upper limit traveling speed to prevent operational failure
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 effectively suppresses the motor brake circuit from reaching dangerous temperatures by reducing heat generation during braking, ensuring continued normal operation and preventing sudden acceleration when the temperature cools down.
Implementation Method 1
When the motor brake circuit is to electrically brake the motor, the motor brake circuit generates heat by a current that flows in the motor brake circuit
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 control device configured to control the motor via the motor drive circuit and the motor brake circuit so that a travelling speed of the cart becomes equal to or lower than an upper limit travelling speed, and a temperature sensor configured to detect a temperature of the motor brake circuit. The control device may be configured to change the upper limit travelling speed to a second upper limit travelling speed lower than the first upper limit travelling speed when the upper limit travelling speed is a first upper limit travelling speed and the temperature detected by the temperature sensor exceeds a first predetermined temperature.