Stepping motor

A stepper motor is an open-loop control stepper motor that converts electrical pulse signals to angular displacement or linear displacement. In the case of non-overloading, the speed of the motor, the position of the stop depends only on the frequency and number of pulses of the pulse signal, and is not affected by the load change. When the step driver receives a pulse signal, it drives the stepper motor. The set direction is rotated by a fixed angle, called the "step angle", and its rotation is performed step by step at a fixed angle. By controlling the number of pulses to control the amount of angular displacement, so as to achieve the purpose of accurate positioning; at the same time can control the pulse frequency to control the speed and acceleration of the motor rotation, so as to achieve the purpose of speed control.

Working principle Stepper motor is an induction motor, its working principle is the use of electronic circuits, when the DC power supply component, multi-phase timing control current, with this current for the stepper motor, stepper motor to normal Work, the driver is to provide time-sharing for stepping motors, multi-phase timing controller Although the stepper motor has been widely used, but the stepper motor can not be like ordinary DC motor, AC motor used in the conventional. It must be composed of a dual ring pulse signal, power drive circuit and other control systems. Therefore, it is not easy to use a stepper motor. It involves many professional knowledge such as machinery, motors, electronics and computers.

As an actuator, a stepper motor is one of the key products of electromechanical integration and is widely used in various automation control systems. With the development of microelectronics and computer technology, the demand for stepper motors is increasing day by day, and there are applications in various national economic fields.

Basic principle The rotor of a motor is usually a permanent magnet. When a current flows through a stator winding, a stator magnetic field generates a vector magnetic field. The magnetic field will drive the rotor to rotate an angle so that the direction of a pair of magnetic fields of the rotor coincides with the direction of the magnetic field of the stator. When the stator's vector magnetic field rotates an angle. The rotor also turns an angle with the magnetic field. Each time an electric pulse is input, the motor rotates an angle forward. The angular displacement it outputs is proportional to the number of input pulses and the speed is proportional to the pulse frequency. By changing the order in which the windings are energized, the motor will reverse. Therefore, the number of control pulses, the frequency, and the sequence of energization of the motor phases can be used to control the rotation of the stepper motor.