Starting torque control method without weighing sensor for elevator permanent magnet traction system

Abstract

The invention relates to a weighing-sensor-free starting torque control method of an elevator permanent magnet dragging system, and belongs to the technical field of motor and elevator dragging control. According to the starting torque control method, the problems that under the condition that only position information of a common resolution ratio incremental encoder is used in the elevator permanent magnet dragging system to serve as control system feedbacks, the method of obtaining elevator load weight information through a weight sensor is adopted for maintaining balance before the elevator system operates, the reliability of the elevator system is accordingly reduced, and the cost of the elevator system is accordingly increased are solved. The starting torque control method includes the steps of firstly obtaining a current permanent magnet synchronous motor rotor position value theta through calculation; obtaining the current motor inversed slipping distance deltas and the current motor angular speed omega through calculation; controlling the starting torque of a permanent magnet synchronous motor according to the current motor inversed slipping distance deltas and the current motor angular speed omega to restrain inversed slipping of the permanent magnet synchronous motor in the zero servo period. The weighing-sensor-free starting torque control method is used for the elevator permanent magnet dragging system.

Description

technical field [0001] The invention relates to a load cell-less starting torque control method for an elevator permanent magnet traction system, and belongs to the technical field of motor and elevator traction control. Background technique [0002] The direct drive permanent magnet traction system is being widely used in the field of elevators due to its advantages of machine room-less and high efficiency. For the direct-drive permanent magnet traction system, under the condition of low-resolution incremental encoder, how to improve the ride comfort of the elevator during the transition from parking mode to running mode is one of the key issues. When the elevator switches from parking mode to running mode, that is, during the release process of the electromagnetic brake, the backsliding distance and mechanical vibration must be considered comprehensively to ensure the comfort of the elevator. When the elevator is running, the traction machine drives the car and the counte...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of using a load cell to obtain elevator load weight information to maintain the operation of the elevator system under the condition that the elevator permanent magnet traction system only uses the position information of the ordinary resolution incremental encoder as the feedback of the control system. The balance before the elevator system will cause the problem of lower reliability and higher cost of the elevator system. A method for controlling the starting torque of the elevator permanent magnet traction system without a weighing sensor is provided.

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