Constant Tension Control Method and System for Motor Winding [Invention]

According to the calculation of winding speed and motor frequency and the real-time detection of winding radius, this patent provides a control method and system for constant winding tension of motor without installing tension sensor and photoelectric sensor.

Elevator Communication Matching Resistor Access Control Method and System [Invention]

An access control method for elevator communication matching resistor is provided, which records the addresses of all outer calling boards and matching resistors corresponding to outer calling boards, and ranks the outer calling boards from far to near from the main control board, then determines whether the communication status of the outer calling boards corresponding to the farthest matching resistors is normal.

If the farthest matching resistor is connected to the corresponding outer calling board, if not, continue to judge whether the communication state of the outer calling board corresponding to the matching resistor is normal until the communication state of the outer calling board corresponding to the matching resistor is normal, and until the automatic connection of the matching resistor is completed, this method will not produce incorrect operation of multiple matching resistors accessing simultaneously, and the whole process does not need manual operation.

Methods for Safeguarding Elevator Controller Parameters and Elevators [Inventions]

A method to protect parameter safety of elevator controller is provided by giving different function parameter modification authority through different authority passwords, which provides parameter modification function flexibly. It not only ensures parameter safety of elevator controller, but also makes maintenance of elevator more flexible.