Article Transport Speed Control for Regenerative Resistor Overheating
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Solution Overview
Problem
Existing article transport systems face inefficiencies due to regenerative resistor overheating, which can lead to system shutdowns and reduced transport efficiency, as current methods only measure current conduction periods without accounting for ambient temperature effects.
Innovation Solution
A control system that uses a temperature sensor to detect the regenerative resistor's temperature and adjusts the travel speed of article transport vehicles, disconnecting power supply if the temperature exceeds set thresholds, thereby preventing overheating and maintaining system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the regenerative resistor is used to consume regenerative power, then the regenerative power can be handled, but the temperature of the regenerative resistor rises and may exceed its rating
Solution Approach 1:
The control device performs preliminary action by restricting travel speed before the regenerative resistor temperature exceeds its rating. When the temperature reaches a predetermined threshold, the system proactively limits the travel speed of the article transport vehicle, thereby controlling the regenerative power generation and preventing temperature from rising further. This avoids the need to stop the inverter and maintains continuous operation.
Solution Approach 2:
The system dynamically adjusts the travel speed of the article transport vehicle based on the real-time temperature of the regenerative resistor. Instead of using a fixed speed limit, the control device continuously monitors temperature and adaptively changes the speed restriction level, allowing the system to operate at higher speeds when temperature is low and reducing speeds when temperature rises, thus optimizing both energy handling and thermal management.
2Reliability
If the inverter is stopped to prevent regenerative resistor failure, then the regenerative resistor is protected from overheating, but the article transport vehicle blocks the travel path and system efficiency drops
Solution Approach 1:
The control device performs preliminary action by restricting travel speed before the regenerative resistor temperature exceeds its rating. When the temperature reaches a predetermined threshold, the system proactively limits the travel speed of the article transport vehicle, thereby controlling the regenerative power generation and preventing temperature from rising further. This avoids the need to stop the inverter and maintains continuous operation.
Solution Approach 2:
The system implements feedback control by continuously monitoring the temperature of the regenerative resistor and using this information to adjust the travel speed of the article transport vehicle. The control device receives temperature data from the temperature detection device and dynamically modifies the speed command accordingly, creating a closed-loop control system that maintains reliability while preserving productivity through continuous operation.
3Device complexity
If only the current conduction period of the regenerative resistor is measured to estimate temperature, then the control is simple, but the temperature estimation is insufficient when ambient temperature is high
Solution Approach 1:
The system introduces a temperature detection device as an intermediary to directly measure the actual temperature of the regenerative resistor. Instead of relying solely on indirect estimation through current conduction period measurement, the temperature sensor provides direct temperature feedback, which is then used by the control device to make accurate speed adjustments. This intermediary measurement mechanism significantly improves temperature estimation accuracy while maintaining relatively simple control logic.
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 system effectively suppresses regenerative resistor temperature rise by restricting travel speed before disconnecting power, reducing the likelihood of system shutdowns and maintaining transport efficiency even with changing ambient temperatures.
Implementation Method 1
a temperature sensor configured to detect a temperature of the regenerative resistor
Implementation Method 2
The regenerative resistor generates heat due to the flow of regenerative current
Implementation Method 3
a travel motor configured to drive a wheel, a power supply unit configured to supply power to the travel motor
Implementation Method 4
a regenerative resistor configured to receive supply of regenerative power produced during regeneration of the travel motor
Data Source
AI summary
A transport vehicle control system restricts a travel speed of an article transport vehicle to less than or equal to a restrictive speed prescribed in advance, in a case where a temperature sensor detects that the temperature of a regenerative resistor is greater than or equal to a first temperature set to a higher temperature than a steady temperature range which is a temperature range of a steady state prescribed in advance, and disconnects the connection between a power supply unit and a travel motor with a switch, in a case where the temperature sensor detects that the temperature of the regenerative resistor is greater than or equal to a second temperature set to a higher temperature than the first temperature.