SCR power extension control system for direct current motor

Abstract

The invention discloses an SCR power extension control system for a direct current motor. The SCR power extension control system comprises a DC motor, a speed measurement module, a trigger control module, a conversion adjustment module, a PLC control module, a thyristor rectifying module, a main power supply, a distribution box, a driving module, a microcontroller module, an LCD display module, a speed regulation module, a digital conversion module, an expansion module, an upper computer, a photoelectric encoder and a load. The field effect transistor is driven through the photoelectric isolating module, a working power supply of the direct current motor is isolated from a working power supply of the driving module, interference of harmonic waves generated by the driving circuit on other circuits is reduced, the reliability of the system is improved, the driving amplifier is utilized to amplify driving current, and the high-power requirement of the direct current motor is met. The problem that a direct-current motor speed regulation system arranged by adopting the driving chip is limited by the driving chip and is only suitable for a low-power direct-current motor due to small driving current is solved.

Description

technical field [0001] The invention relates to the technical field of DC motor control systems, in particular to an SCR power expansion control system for DC motors. Background technique [0002] A DC motor is a motor that converts DC electric energy into mechanical energy. It is widely used in electric drive because of its good speed regulation performance. Regarding the problem of the magnetic field, DC motors are divided into three types according to the excitation method: permanent magnet, separate excitation and self-excitation. Among them, self-excitation is divided into three types: shunt excitation, series excitation and compound excitation. DC motors have the characteristics of good speed regulation performance. The so-called "Speed ​​regulation performance" means that the motor can artificially change the speed of the motor according to the needs under a certain load condition. The DC motor can realize uniform and smooth stepless speed regulation under heavy load ...

AI Technical Summary

Problems solved by technology

[0004] 1. The existing DC motor control system usually adopts manual control of relay contactor, the control system is complicated, the control precision is low, and it is difficult to improve the speed control system, which limits the scope of application of the system;

[0005] 2. In the application of DC power supply in the existing DC motor control system, on the one hand, the high-power DC motor speed control system is relatively scarce, and on the other hand, it is limited by the drive chip. The DC motor speed control system set by this drive chip The driving current is small and can only adapt to low-power DC motors. Therefore, a SCR power expansion control system for DC motors is proposed

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