Quick shutdown system and method of industrial sewing machine

Abstract

The invention relates to a quick shutdown system and method of an industrial sewing machine. The system comprises a central processing unit, a bridge rectifier circuit composed of six switching tubes and a DC brushless electric machine used for controlling the operation of the industrial sewing machine, wherein the input end of the bridge rectifier circuit is connected with a system power supply; the triple outputs of the bridge rectifier circuit are connected with the three-phase winding of the DC brushless electric machine in turn; the control ends of the switching tubes are separately connected with the six-way PWM control signals of the central processing unit; an optical-electricity encoder and a position sensor which are arranged on the DC brushless electric machine and the pin signal and pedal signal of the industrial sewing machine are separately connected with the central processing unit; and the central processing unit continuously collects the motor speed, calculates the PWM duty ratio of six-way drive waveform and controls the on / off state of the three switching tubes of the middle and lower bridge arms of the bridge rectifier circuit, thus realizing quick shutdown. By using the system of the invention, the shutdown time of the industrial sewing machine can be greatly shortened, the production efficiency can be increased, the shutdown process is stable without causing motor vibration, and the reliability is good.

Description

technical field [0001] The invention relates to an industrial sewing machine, in particular to an industrial sewing machine fast parking system and a method thereof which improve the parking stability and shorten the parking time. Background technique [0002] At present, most of the industrial sewing machine computer flat cars use DC brushless motors, and the main circuit of the drive part of the DC brushless motors generally uses such as figure 1 circuit shown, figure 1 Among them, T1~T6 are switching tubes, D1~D6 are fast recovery diodes, RA, RB, RC are the internal resistance of each phase of the motor, LA, LB, LC are the inductance of each phase of the motor, Ud is the DC bus voltage supplied by the power supply, EA , EB, EC are the motor winding back electromotive force. Brushless DC motors are widely used due to their good speed regulation performance and no need for maintenance. At present, most of the lockstitch sewing machines in the country use the method of fi...

AI Technical Summary

Problems solved by technology

[0003] The invention mainly solves the technical problems that the original industrial sewing machine stops for a long time, which affects the production efficiency, and the motor will shake when it stops, the parking process is not stable enough, and the reliability and safety are not ideal; it provides a method that can make the industrial sewing machine stop quickly, Greatly shorten downtime, improve production efficiency, and the parking process is relatively stable, will not produce motor vibration, improve reliability and safety of the industrial sewing machine fast parking system and method

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