Elevator Bus Voltage Control via Automatic Reference Detection
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Solution Overview
Problem
Existing elevator control devices require manual adjustment of bus voltage, which is time-consuming and prone to errors, and cannot adapt to environmental changes, leading to inefficient power regeneration and potential overheating of regenerative resistance.
Innovation Solution
An elevator control device with a power supply side current controller, main circuit bus, inverter, regenerative resistance, bus voltage controller, and control unit that automatically sets the bus voltage by detecting reference values during power running and regeneration modes, preventing overheating and optimizing power regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment is used to set bus voltage, then the device can be adjusted, but it takes time and is prone to erroneous setting
Solution Approach 1:
The control device automatically detects the first reference value (when car is at lowest position) and second reference value (when regenerative resistance is turned on), then autonomously determines the optimal bus voltage without requiring manual intervention. This self-service approach eliminates the time-consuming manual adjustment process while ensuring accurate voltage setting.
Solution Approach 2:
The control device continuously monitors bus voltage and compares it with the detected reference values, automatically adjusting the bus voltage controller to maintain optimal operation. This feedback mechanism replaces manual adjustment with automated control based on real-time voltage detection.
2Ease of operation
If manual adjustment is used to set bus voltage, then the device can be adjusted, but it cannot address environmental change
Solution Approach 1:
The control device dynamically adapts to environmental changes by continuously detecting bus voltage characteristics and automatically adjusting the bus voltage based on detected reference values. This dynamic adjustment capability allows the system to respond to changing operational conditions, power supply variations, and environmental factors without manual intervention.
Solution Approach 2:
The system automatically detects and adapts to environmental changes through continuous voltage monitoring and self-adjustment, eliminating the need for manual re-adjustment when environmental conditions change. The control unit autonomously modifies bus voltage to optimize performance under varying conditions.
3Power
If regenerative resistance is continuously supplied with power, then the resistance is turned on, but the regenerative resistance is overheated
Solution Approach 1:
The control device monitors bus voltage and detects when the second reference value is reached (indicating regenerative resistance should be turned on), then automatically controls the bus voltage controller to prevent excessive power supply to the regenerative resistance. This feedback control prevents overheating by maintaining appropriate voltage levels.
Solution Approach 2:
The control device changes the bus voltage parameter dynamically based on detected reference values, adjusting the voltage to appropriate levels that prevent overheating of the regenerative resistance while still enabling effective power regeneration when needed.
4Loss of energy
If bus voltage is not appropriately set, then power is wasted, but automatic setting is not implemented
Solution Approach 1:
The control device automatically determines and sets the optimal bus voltage by detecting reference values during operation, eliminating the need for manual adjustment and ensuring energy-efficient operation. This self-service automatic setting prevents wasteful power consumption by maintaining appropriate voltage levels.
Solution Approach 2:
The system continuously monitors bus voltage and automatically adjusts it based on detected reference values, providing feedback control that prevents energy waste. The automatic setting mechanism ensures optimal voltage levels are maintained without manual intervention.
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
Automatically and appropriately sets the bus voltage, preventing overheating of the regenerative resistance and efficiently regenerating power, while adapting to environmental changes and reducing wasteful power supply during power running operations.
Implementation Method 1
a regenerative resistance (12) connected to the main circuit bus (10)... when the operation mode of an elevator is a regeneration mode
Implementation Method 2
The regenerative resistance wastefully consumes power generated during regenerative operation of the elevator as heat... the regenerative resistance is overheated
Data Source
AI summary
An elevator control device which can automatically and appropriately set a bus voltage. Therefore, the elevator control device includes a power supply side current controller, a main circuit bus, an inverter, a regenerative resistance, a bus voltage controller, and a control unit which detects a first reference value of a bus voltage of the main circuit bus when the bus voltage of the main circuit bus becomes a receiving voltage from a power supply, detects a second reference value of the bus voltage of the main circuit bus when the regenerative resistance is turned on, and controls the bus voltage controller so that a value of the bus voltage of the main circuit bus becomes a value between the first reference value and the second reference value.