Stepping motor is an open-loop control motor that converts electric pulse signal into angular displacement or line displacement. It is the main executing element in modern digital program control system. It is widely used. The In the case of non-overload, the speed of the motor, the stop position depends only on the frequency and the number of pulses of the pulse signal, and is not affected by the load change. When the stepping driver receives a pulse signal, it drives the stepper motor Set the direction of rotation of a fixed angle, known as the "step angle", its rotation is a fixed angle step by step to run. Can control the number of pulses to control the angular displacement, so as to achieve the purpose of accurate positioning; at the same time by controlling the pulse frequency to control the motor speed and acceleration, so as to achieve the purpose of speed.
Stepper motor is a kind of induction motor, its working principle is the use of electronic circuits, the DC into a time-sharing power supply, multi-phase timing control current, with this current for the stepper motor power supply, stepper motor to work properly, The driver is a multi-phase timing controller for the stepper motor.
Although the stepper motor has been widely used, but the stepper motor does not like ordinary DC motor, AC motor under normal use. It must be double ring pulse signal, power drive circuit and other components of the control system can be used. So it is not easy to use stepper motor, it involves the mechanical, electrical, electronics and computer and many other professional knowledge. Stepper motor as an actuator, mechanical and electrical integration is one of the key products, widely used in a variety of automated control systems. With the development of microelectronics and computer technology, stepper motor demand is increasing, in all national economic areas have applications.
Stepper motor, also known as pulse motor, based on the most basic principle of electromagnet, it is a free rotation of the electromagnet, the action principle is to rely on changes in air gap to produce electromagnetic torque. The original model is derived from years to years. Attempts to control for the purpose of the test, applied to the hydrogen arc lamp electrode conveyor mechanism. This is considered to be the first stepper motor. At the beginning of the twentieth century, stepper motors were widely used in telephone automatic switches. As the Western capitalist powers compete for colonies, stepper motors have been widely used in independent systems such as ships and aircraft lacking AC power. The inventions of transistors in the late 1950s also gradually applied to stepper motors, making it easier to control digitally. In the eighties, due to the low-cost microcomputer to multi-functional posture, stepper motor control more flexible and diverse.
The biggest difference between a stepper motor and other control applications is that it receives a digital control signal and converts it into a corresponding angular or linear displacement, which itself is an actuator that performs digital mode conversion. And it can be open-loop position control, enter a pulse signal to get a specified position increment, so that the so-called incremental position control system compared with the traditional DC control system, its cost is significantly reduced, almost no system adjustment. The angular displacement of the stepper motor is strictly proportional to the number of pulses entered and is synchronized with the pulse in time. So as long as the control of the number of pulses, frequency and motor winding phase sequence, you can get the required corner, speed and direction.