Multi-Drive Elevator Control Device Gate Signal Noise Immunity
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Solution Overview
Problem
Conventional elevator control devices face issues with noise immunity in gate signals due to long wiring between gate amplifiers and power converters, leading to potential malfunctions and complex equipment arrangements.
Innovation Solution
A multi-drive elevator control device with two or more driving controllers, each equipped with a power converter, a speed controller, and a torque distributor, which transmits distributed torque commands via a communication device to shorten gate signal lines and improve noise immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional multi-drive elevator control device transmits gate signals through long wiring from gate amplifier to power converters, then the equipment arrangement is flexible, but the noise immunity of gate signals decreases
Solution Approach 1:
The patent replaces the mechanical wiring system for transmitting gate signals with a communication device that transmits distributed torque commands electronically. This substitution eliminates the need for long physical gate signal lines, thereby improving noise immunity while maintaining the ability to control multiple power converters.
Solution Approach 2:
The patent introduces a communication device as an intermediary between the gate amplifier and power converters. Instead of directly transmitting gate signals through long wires, the system uses the communication device to transmit distributed torque commands, which then control the power converters. This intermediary approach resolves the contradiction by eliminating long signal lines while maintaining control functionality.
2Reliability
If multiple power converters are housed on one control panel to shorten gate signal lines, then the noise immunity improves, but the component devices become big and wiring becomes intricate
Solution Approach 1:
The patent replaces the physical gate signal transmission system with a communication-based system. By transmitting distributed torque commands through communication devices rather than using long gate signal lines, the system achieves improved noise immunity without requiring power converters to be housed close together, thus avoiding increased wiring complexity and larger control panel size.
3Length of stationary object
If a single gate amplifier controls multiple power converters, then the gate signal lines are shortened, but the equipment arrangement freedom is impaired
Solution Approach 1:
The patent makes each driving controller universal by equipping it with both power converter and communication device functionality. Each controller can independently receive distributed torque commands and control its associated power converter, eliminating the need for a single gate amplifier to control multiple converters. This multi-functional approach shortens gate signal lines while preserving equipment arrangement flexibility.
Data Source
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AI summary
Provided is a multi-drive elevator control device which can shorten gate signal lines between a gate amplifier and each power converter and is capable of improving the noise immunity in gate signals. For this purpose, an elevator control device having two or more driving controllers, a motor which drives an elevator by being controlled by each of the driving controllers, and a power converter which is provided in each of the driving controllers and supplies power to the motors comprises: a speed controller which is provided in one of the driving controllers and outputs a torque command on the basis of a speed command; a torque distributor which is provided in the one driving controller and distributes the torque command to a distributed torque command of each of the driving controllers; and a communication device which transmits the distributed torque command to the other riving controller. In this elevator control device, the power converter provided in the other driving controller supplies power to the motor in accordance with the distributed torque command transmitted by the communication device.