motor control circuit

Abstract

The invention discloses a motor control circuit. The motor control circuit comprises a selection switch, a contactor, a thermal relay and a display lamp, wherein the selection switch is configured to be connected to a positive electrode of a power supply and used for switching a manual control mode and an automatic control mode; one end of the contactor is connected to the selection switch, the contactor is electrified to control the closing of a contactor switch and powered off to control the opening of the contactor switch; one end of the thermal relay is connected to the contactor, the other end of the thermal relay is connected to a negative electrode of the power supply through the motor, the temperature of the thermal relay exceeds a preset value, the thermal relay is disconnected, a thermal relay switch is controlled to open, when the temperature of the thermal relay is lower than or equal to the preset value, the thermal relay is closed, and the thermal relay switch is controlled to close; one end of the display lamp is arranged between the contactor and the thermal relay through the contactor switch, and the other end of the display lamp is connected to the negative electrode of the power supply. The motor control circuit is simple to produce and install and convenient and safe to operate; the working efficiency of the motor is higher.

Description

Technical field [0001] The invention relates to the field of control circuits, and in particular to a motor control circuit. Background technique [0002] Pellet electrostatic precipitator is one of the production supporting process equipment. The performance of the electrostatic precipitator is affected by a series of factors of the flue gas in the drying and preheating section of the grate machine, especially rheumatism, wind speed, flue gas temperature, flue dust specific resistance, electric field machinery Intensity changes and influencing factors such as dust concentration, high temperature of flue gas, deformation of anode and cathode, etc. When the pellet production process fails, the flue gas temperature rises linearly, and the cathode and anode of the electrostatic precipitator electric field are deformed up to 300℃. The primary and secondary voltage drops and the current increases, the electric field cannot work normally. The normal operation of the electrostatic pre...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the unstable performance of the electrostatic precipitator in the prior art, which often causes unstable work due to too high temperature, and to provide a motor control circuit, which is simple to manufacture and install, easy to operate, Safe, making the working efficiency of the motor higher, and can effectively improve the dust collection efficiency of the electrostatic precipitator

Images