Elevator Seal Star Function Detection via Motor Speed Monitoring
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Solution Overview
Problem
The elevator industry lacks a simple, reliable, safe, and low-cost solution for detecting the seal star function, which is crucial for preventing motor slipping due to a failed holding brake.
Innovation Solution
A device and method utilizing a safety circuit with a safety relay and switch, an elevator door bypass unit, and a control unit to enable power supply to the elevator motor and holding brake within a set door area, and measure the elevator car's speed to determine the normalcy of the seal star function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal star function detection solution is implemented, then safety is improved, but device complexity increases
Solution Approach 1:
The elevator system performs self-diagnosis of the seal star function using its own existing components (door bypass unit, safety circuit, control unit) without requiring external detection equipment. The system monitors itself by temporarily bypassing the safety circuit and measuring motor current under controlled conditions, eliminating the need for separate detection devices and reducing overall system complexity.
2Reliability
If a seal star function detection solution is implemented, then safety is improved, but development time increases
Solution Approach 1:
The control unit and door bypass unit, which are already present in the elevator system for normal operation, are made multi-functional by enabling them to perform seal star function detection as well. The existing safety circuit components are reused for detection purposes, eliminating the need for separate detection hardware and reducing both development time and device complexity.
Solution Approach 2:
The detection method replaces complex physical testing equipment with electrical measurement and control software. By using the control unit to monitor motor current and calculate seal star function status, the system substitutes hardware-based detection with software-based analysis, significantly reducing development time and complexity.
3Reliability
If a seal star function detection solution is implemented, then reliability is improved, but cost increases
Solution Approach 1:
The system uses its own existing components (door bypass unit, safety circuit, control unit) to perform self-diagnosis, eliminating the need for external detection equipment. This self-service approach avoids additional hardware costs while maintaining high reliability through regular monitoring of the seal star function.
Solution Approach 2:
Existing components are made multi-functional to perform both normal elevator operation and seal star function detection. The door bypass unit and control unit serve dual purposes, eliminating the need for separate detection hardware and reducing overall system cost while improving reliability through continuous monitoring capability.
Data Source
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AI summary
The present application relates to elevator safety technology, in particular to a device and method for detecting a seal star function of an elevator system and readable storage medium on which a computer program for implementing the method is stored. The device for detecting a seal star function of an elevator system according to one aspect of the present application comprises: an elevator door bypass unit configured to enable power supply to an elevator motor and a holding brake when an elevator car is located in a set area and to cut off the power supply to the elevator motor and the holding brake when the elevator car leaves the set area; a control unit coupled with a safety relay and the elevator door bypass unit and configured to perform the following operations: placing a landing door and an elevator door associated with a safety switch in a closed state and placing the safety relay in an opened state; bringing the elevator door bypass unit into an enabled state to replace a safety circuit to perform a control function of the power supply to the elevator motor and the holding brake; determining whether the seal star function is normal based on speed of movement of the elevator car within the set area.