What's the difference between a step-down motor and a dc decelerator? I want to control it with a single chip, and I don't know what the difference is. What is the mode of control?
Dc motor speed is high, sometimes can reach hundreds to thousands of revolutions per minute, the speed for real-time control systems put forward high request, if control system failed to keep pace with, that will cause out of control. After the reduction gear, motor speed decreases significantly, sometimes can be dropped to 36-200 RPM, using single chip microcomputer control motor operation is relatively easy. A simple example, if you do the smart car, with general dc motor, to control the motor running, turning, obstacle avoidance will be quite difficult, it is easy to run partial, but if you use dc motor control is quite easy.
In terms of control: The PWM control, which is used by dc motor, usually requires the motor driven plate Step motor control requires specific pulse sequences, usually four lines, which require special control boards In the design principle, the dc motor is the force of the magnetic force. The step motor is a change in the movement of the pulse signal to the magnetic field force. Look up the information, and understand that it may not be exactly right. Usage: dc motor, rotating application. The speed can be controlled according to the speed of the speed. It is mainly applied to power. The step motor is controlled by the Angle of each pulse sequence. The Angle of rotation of each pulse is fixed, and the Angle of accuracy can be controlled. It is commonly used in places where the target?
The step motor is an open loop controlling element which converts the electrical pulse signal into angular displacement or line displacement. In the case of the overload, motor speed, stop position depends only on the pulse signal frequency and pulse number, and not affected by load change, when the stepper driver receives a pulse signal, it is driving a stepper motor according to set the direction of a fixed Angle, known as the "step Angle", its rotation is based on the Angle of the fixed step by step. It can control the amount of angular displacement by controlling the number of pulses, so as to achieve accurate positioning. At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency to achieve the goal of speed adjustment. And dc motors are ordinary little motors, nothing special, as long as the power supply is enough. In order to control with a single chip, it can be controlled by pulse wave, which can be controlled by air ratio, but with power amplifier circuit.
Stepper motor and dc motor in the electrical machinery is a completely different type of motor, dc motor as long as plus appropriate voltage will turn, and turn laps is difficult to precisely control; The stepper motor works according to the beat, which can rotate a tiny Angle (such as 0.1 degree). Step gear motor and dc gear motor are based on their respective motor increased the reduction gear (gear), can put the droop down, and the role of the speed reducer is similar. There have difference control manner, control of stepping motor is similar to digital circuit, needs a beat (similar to the digital tube display, single chip cycle parallel output certain values, according to certain rhythm.) Commonly used small, can use ULN2003 stepper motor drive, and a much higher working current of dc motor, general small dc motors with a dedicated driver chip driver L298N, general output PWM wave to control by single chip microcomputer control.
