It consists of AT89C52 single-chip microcomputer, optocoupler, integrated chips L297 and L298.įigure 2. The block diagram of the stepper motor control driver designed in this blog is shown in Figure 2. The stepper motor controlled in the blog is a four-phase unipolar 35BY48HJ120 deceleration stepper motor. Typical stepper motor control block diagram VI Hardware The power amplifier mainly amplifies the smaller output signal of the ring distributor to achieve the purpose of driving the stepper motor.įigure 1. The other is a ring distributor composed of hardware.One is to use computer software design methods to achieve the functions required by the ring divider, usually called a soft ring divider.There are two main categories of ring distributors: Then it is amplified by the power amplifier and added to the input terminals of the stepping motor drive power supply to drive the rotation of the stepping motor, The main function of the ring distributor is to distribute the pulse sequence from the control link according to a certain rule. It provides a pulse train for the ring distributor. The controller can send out pulse signals whose pulse frequency can be continuously changed from a few hertz to tens of kilohertz. A typical stepping motor control system is shown in Figure 1. Instead, a special device, a stepping motor. Since a stepper motor is an actuator that converts electrical pulse signals into linear or angular displacement, it cannot be directly connected to AC and DC power supplies. That is, it is possible to form a stepper motor drive circuit with good performance at a relatively cheap price. L297 and L298 can easily form a stepping motor driver and combine with AT89C52 single-chip microcomputer for control. Therefore, it is widely used in numerical control systems, automatic production lines, automatic instruments, plotters, and computer peripherals. The stepping motor has the characteristics of convenient control and small size. The actual measurement shows that the stepping motor drive system designed by this method has the characteristics of simple hardware structure, easy software programming, and low price.Ī stepping motor is a precision actuator that converts electrical pulse signals into angular displacement or linear displacement. This blog gives the control schematic diagram. At the same time, combined with the AT89C52 single-chip microcomputer, a simple method of driving a stepper motor is introduced. The performance and structure of the stepper motor driver chip L297 / L298 are analyzed.
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