Elevator Vibration Control Using Frequency-Reduced Speed Commands
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Solution Overview
Problem
Existing elevator control devices require complex calculations involving mechanical parameters like rope spring constant and rope viscosity coefficient to control uncomfortable vibrations, making them cumbersome.
Innovation Solution
An elevator control device that includes a car speed instruction value generator, motor speed controller, and a car vibration control calculator to generate a motor speed instruction value with a reduced vibration frequency component, simplifying the calculation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If notch filter or vibration control method using mechanical parameters is used, then uncomfortable vibration in car can be controlled, but complicated calculation is required
Solution Approach 1:
The invention changes the control parameter from mechanical parameters (rope spring constant, rope viscosity coefficient) to vibration frequency components detected from car acceleration. By using acceleration sensors to detect actual vibration frequencies and adjusting motor speed based on these detected frequencies, the system achieves vibration control without complex mechanical parameter calculations.
Solution Approach 2:
The invention replaces the mechanical parameter-based vibration control system with an sensor-based system. Instead of calculating mechanical properties of the rope and sheave system, the system uses acceleration sensors to detect actual vibrations and processes this information through simple frequency component extraction and motor speed adjustment, substituting complex mechanical analysis with simpler signal processing.
2Object-affected harmful factors
If mechanical parameters like rope spring constant and rope viscosity coefficient are used for vibration control, then vibration can be controlled, but the control device becomes complex
Solution Approach 1:
The invention extracts only the essential vibration frequency information from the complex mechanical system behavior. By using acceleration sensors to detect and extract vibration frequency components directly from car motion, the system separates the vibration control function from the complex mechanical parameter calculations, achieving simplicity by taking out only the necessary frequency information.
Solution Approach 2:
The system uses the car's own vibration characteristics (detected through acceleration sensors) to generate the control signal. The vibration frequencies detected from the car's actual motion are directly used to adjust motor speed, making the system self-regulating without requiring external complex mechanical parameter inputs or calculations.
Data Source
AI summary
Provided is an elevator control device that can control uncomfortable vibration in a car by using simple calculation. The elevator control device includes, in an elevator in which the car and a counter weight are supported by a main rope wound around a sheave of a motor, a car speed instruction value generator that generates a car speed instruction value with respect to the car; a motor speed controller that controls a motor drive circuit that controls rotation of the motor, based on a motor speed instruction value; and a car vibration control calculator that outputs to the motor speed controller the motor speed instruction value having, relative to the car speed instruction value, a reduced component of a vibration frequency of vibration generated in the car.