Control system and method with three direct-current motors in forward-direction serial connection

Abstract

The invention discloses a control system and method with three direct-current motors in forward-direction serial connection. The system is characterized in that eight IGBT modules form four bridge arms in a two-two serial connection manner, the four bridge arms are parallelly connected to the positive electrode and the negative electrode of a direct-current power supply, the three direct-current motors in forward-direction serial connection are serially connected with the four bridge arms, the three direct-current motors are connected with a reference voltage synthesizer sequentially through aspeed sensor, a current sensor, a speed adjusting module and a secondary PI controller, the reference voltage synthesizer is connected with a four-phase inverter through a PWM pulse generating unit,the four-phase inverter is connected with the reference voltage synthesizer through a current adjusting module and a primary PI controller, the four-phase inverter is connected to the PWM pulse generating unit through the reference voltage synthesizer, and pulse control signals generated by the PWM pulse generating unit controls the on and off of the eight IGBT modules to drive the three direct-current motors to operate. The control system is few in used circuit components, simple in structure, stable and reliable in performance and worthy of popularization and application.

Description

technical field [0001] The invention belongs to the field of motor system and control technology, and in particular relates to a forward series control system and method of three DC motors. Background technique [0002] With the improvement of people's living standards and the development of modern production and office automation, household appliances, industrial robots and other equipment are becoming more and more efficient, miniaturized and highly intelligent. As an important part of actuators, motors must With the characteristics of high precision, fast speed, and high efficiency, the application of DC motors has also grown rapidly. [0003] In specific applications, the DC motor should realize four motion states: forward electric, reverse electric, forward feedback braking and reverse feedback braking. Reversing the electromagnetic torque is generally referred to as the four-quadrant control of the DC motor. [0004] The four-quadrant control circuit of the DC motor ...

AI Technical Summary

Problems solved by technology

[0004] The four-quadrant control circuit of the DC motor in the prior art often has a complex structure, many functional modules, and is expensive, but its performance is not perfect. How to design a driving circuit with a simple structure and excellent performance is a constant challenge for those skilled in the art. Direction of the research

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