Maintenance Panel Position Sensor for Elevator Speed Control
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Solution Overview
Problem
Conventional maintenance switchboards for elevators are difficult to use for precise and safe movement of elevator cars during maintenance, as they lack the ability to adjust speed dynamically and often result in jerking or jumping due to fixed power supply states.
Innovation Solution
Incorporating position sensors into the buttons of the maintenance switchboard allows for real-time control of the elevator car's speed based on the button's actuation position, enabling gradual speed adjustments and reducing the risk of sudden stops or jumps by allowing the technician to control the speed through the actuation depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pushbuttons with fixed switching states are used, then the device complexity is low, but the ease of operation deteriorates due to inability to adjust speed dynamically
Solution Approach 1:
The pushbutton is transformed from a static switching element to a dynamic control element by integrating a position sensor that continuously monitors the actuating element's position. This allows the button to provide variable speed control signals corresponding to different actuation positions, enabling dynamic speed adjustment during elevator car movement while maintaining a simple button interface.
Solution Approach 2:
The mechanical pushbutton system is enhanced by replacing pure mechanical switching with an integrated sensor system. The position sensor (electrical, magnetic, or optical) substitutes for complex mechanical linkages, providing precise position detection and enabling electronic speed control based on actuation depth while keeping the mechanical button structure simple.
2Productivity
If preset speed is used, then the device complexity is low, but the productivity deteriorates due to time-consuming maintenance procedures
Solution Approach 1:
The speed control transitions from static preset values to dynamic adjustment based on button actuation position. The position sensor enables continuous speed variation during movement, allowing technicians to optimize travel speed for different maintenance scenarios and reduce overall maintenance time while using the same simple control interface.
Solution Approach 2:
The speed parameter is changed from fixed preset values to variable values determined by the actuating element's position. The control unit adjusts the drive mechanism's speed parameter in real-time based on the position sensor feedback, enabling faster traversal during maintenance operations while maintaining safety through controlled acceleration and deceleration.
3Measurement precision
If simple switching elements are used, then the device complexity is low, but the measurement precision deteriorates due to inability to detect button position
Solution Approach 1:
The simple mechanical switching element is augmented with an electrical, magnetic, or optical position sensor that precisely detects the actuating element's position. This sensor system replaces the need for complex mechanical position indication mechanisms while providing accurate position data to the control unit for precise speed regulation.
Solution Approach 2:
A position sensor acts as an intermediary between the mechanical button actuation and the electronic speed control system. The sensor translates mechanical position into electrical signals that the control unit can process, enabling precise measurement of actuation depth without adding visible complexity to the button interface.
4Reliability
If fixed power supply states are used, then the device complexity is low, but the reliability deteriorates due to jerking and jumping movements
Solution Approach 1:
A feedback loop is established where the position sensor continuously monitors the actuating element's position and communicates this information to the control unit. The control unit adjusts the power supply to the drive mechanism in real-time based on this feedback, enabling smooth acceleration and deceleration that prevents jerking and jumping movements, thereby improving safety and reliability.
Solution Approach 2:
The power supply transitions from fixed static states to dynamic adjustment based on button actuation position and movement phase. The control unit modulates power delivery according to the actuating element's position signal, providing controlled acceleration during start-up and controlled deceleration during stopping, which eliminates sudden movements and improves operational reliability.
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 solution enables easier, quicker, and safer movement of elevator cars by allowing technicians to control the speed intuitively, reducing the risk of jerking and jumping, and ensuring precise positioning.
Implementation Method 1
A position sensor is provided on at least one of the pushbuttons, monitoring the respective pushbutton and configured to detect the current position of the actuating element of the respective pushbutton and to output a position signal corresponding to the detected position
Data Source
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AI summary
A maintenance panel (3) and a lift controller (5) equipped therewith for controlling displacement movements of a lift cabin are described. The maintenance panel (3) has at least three buttons (18) comprising an activation button (19), a downwards direction button (21) and an upwards direction button (23). Each of the buttons (18) in each case has an actuation element (27) able to be displaced in an actuation direction (25) and is configured so as to change from a non-actuated to an actuated actuation state when the actuation element (27) is displaced beyond a respective actuation position and to output an actuation signal that correlates with the respective actuation state. A position sensor (29) monitoring the respective button (18) is in this case provided on at least one of the buttons (18), which position sensor is configured so as to detect a current position of the actuation element (27) of the respective button (18) and to output a position signal that correlates with the detected position. Taking the position signal into consideration, the lift controller (5) is able to control a supply of power to a drive motor of the lift installation and thus a travel speed of the lift cabin. A maintenance technician is thus able to intuitively control the travel speed depending on how strongly he actuates the button (18) provided with the position sensor (29). Abrupt starting or braking of the lift cabin (9) is thus able to be avoided.