Elevator Pre-Torque Calibration Using Current and Height Feedback
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Solution Overview
Problem
Existing methods for determining the holding torque in elevator systems are time-consuming and prone to inaccuracies due to varying friction conditions, which affect the equilibrium state and ride quality.
Innovation Solution
A method involving test runs with and without weight, combined with current and height measurement data, to calculate a calibration function for determining the holding torque, allowing for precise adjustment of the electric motor to maintain equilibrium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gradual approach with multiple counterweight adjustments is used to achieve equilibrium, then the equilibrium state can be achieved, but the process becomes very time-consuming
Solution Approach 1:
The patent performs preliminary test runs (first, second, third, and fourth test runs) to collect current measurement data and height measurement data before the actual equilibrium determination. By pre-collecting this data during controlled test operations, the system eliminates the need for time-consuming gradual adjustments during normal operation, directly calculating the holding torque from the pre-acquired measurements.
Solution Approach 2:
The patent replaces the mechanical gradual adjustment process with an automated calculation system. Instead of physically adding or removing counterweights step-by-step, the system uses a calculating device that processes current measurement data and height measurement data from test runs to compute the holding torque and equilibrium state automatically, significantly reducing adjustment time.
2Reliability
If a gradual adjustment approach is used to determine equilibrium, then equilibrium can be achieved, but measurement accuracy decreases due to varying friction conditions
Solution Approach 1:
The patent performs preliminary test runs (first, second, third, and fourth test runs) to collect current measurement data and height measurement data under controlled conditions before the actual equilibrium determination. By pre-collecting this data during controlled test operations, the system eliminates the need for time-consuming gradual adjustments during normal operation, directly calculating the holding torque from the pre-acquired measurements.
Solution Approach 2:
The patent uses feedback from current measurement data and height measurement data collected during test runs to calculate and determine the holding torque. The calculating device processes this feedback information to compute the equilibrium state, allowing the system to adjust for friction variations and achieve accurate measurements without relying on gradual mechanical adjustments.
3Device complexity
If friction conditions are not accounted for in equilibrium determination, then the process is simpler, but ride quality deteriorates due to inaccurate holding torque
Solution Approach 1:
The patent uses feedback from current measurement data and height measurement data collected during test runs to calculate and determine the holding torque. The calculating device processes this feedback information to compute the equilibrium state, allowing the system to adjust for friction variations and achieve accurate measurements without relying on gradual mechanical adjustments.
Solution Approach 2:
The patent changes the approach from mechanical parameter adjustment (gradual counterweight changes) to computational parameter calculation. By using the calculating device to compute holding torque based on current and height measurement data, the system accounts for friction conditions through mathematical relationships rather than physical adjustments, maintaining both simplicity and accuracy.
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 approach simplifies and enhances the accuracy of holding torque determination, reducing measurement inaccuracies and ensuring stable car positioning after brake release, thereby improving ride quality.
Implementation Method 1
an electric motor for driving the car
Implementation Method 2
current measurement data, indicating a current flowing through the electric motor as measured by a current measuring device
Implementation Method 3
height measurement data, indicating a height of the car relative to the first and/or second position as measured by a height measuring device
Implementation Method 4
determine a holding torque for applying to the electric motor before the car is moved
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A method for determining a lead torque of an elevator system (100) comprises the steps of: generating control commands for actuating an electric motor (110) such that an elevator car (104) which is coupled to the counterweight carries out at least one first, second, third, and fourth test run, wherein the elevator car is moved from a first position into a second position in each of the first and third test runs and from the second position into the first position in each of the second and fourth test runs, and the elevator car is loaded with a weight (126) in the third and fourth test runs and is not loaded with the weight in the first and second test runs; receiving current-measurement data, which indicates the current flowing through the electric motor, said current being measured by a current-measuring device (124) during the movement of the elevator car, and height measurement data, which indicates the height of the elevator car relative to the first and/or second position, said height being measured by a height measuring device (122) during the movement of the elevator car, in multiple successive time steps in each test run; calculating at least one parameter of a calibration function, which defines a relationship between the current, the height, and the weight, using the current-measurement data and the height measurement data received in different test runs in order to obtain at least one calibration value; and calculating an adaptation value using the at least one calibration value in order to adapt the counterweight so that the counterweight is in equilibrium with the elevator car (104).