Electromagnet pull-in circuit for industrial sewing machine

Abstract

The invention discloses an electromagnet pull-in circuit for industrial sewing machines, in which the electromagnet wire package L is connected in parallel with D1, the cathode of D1 is connected with the power supply DC+, the drain of the NMOS tube is connected with the anode of D1, and the grid is connected to the UC3844 through R2 6 pins, the source is grounded through Rs1; R4 is connected between the gate and the source; the control signal output by the external control chip is connected to 2 pins of UC3844; 3 pins of UC3844 are respectively connected to R8 and C9, and the other of C9 One end is grounded, and the other end of R8 is connected to the source; UC3844's 4-pin is grounded through C3, UC3844's 7-pin is grounded through C2, and the two ends of R1 are connected between UC3844's 4-pin and 7-pin; R3 and C7 are connected in parallel One end is connected to pin 1 of UC3844, and the other end is grounded. The invention directly utilizes the DC bus voltage of the industrial sewing machine to drive the motor to generate current to attract the electromagnet, the circuit is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of industrial sewing machines, in particular to an electromagnet pull-in circuit for industrial sewing machines. Background technique [0002] There are many electromagnetic actuators in modern sewing equipment, such as thread trimming, thread pulling, presser foot lifting electromagnets, etc. These electromagnets cooperate with the electric control part of sewing equipment to complete many automation tasks of sewing equipment , plays a connecting role in the control system, can convert electrical energy into mechanical energy, and plays an indispensable role in industrial sewing machines. Electromagnets can be divided into DC electromagnets, AC electromagnets and integral electromagnets according to the nature of their coil currents. The operating voltage of the AC electromagnet is generally AC 220V, and the electrical circuit configuration is simple; the DC electromagnet generally uses 24V DC voltage, so a dedicate...

AI Technical Summary

Problems solved by technology

[0003] Generally, the electromagnets used in industrial sewing machines are powered by low-voltage power supplies, while the main power supply of industrial sewing machines is obtained by rectifying 220V AC, and the voltage is relatively high. There are two commonly used solutions: (1) Design DC / The DC converter provides a lower voltage direct current to realize the pull-in and pop-up of the electromagnet; (2) Use pulse width modulation (PWM) technology to reduce the higher voltage direct current to a lower voltage direct current, which requires the use of a drive , sampling and other special chips, the circuit is complex and the cost is high

Images