How does stepping motor and actuator work?
Half step drive (2 segmentation) In the single phase excitation, step motor shaft stop to the whole position, drive after receiving the next pulse, such as to another phase excitation and keep the original one after another in excitation state, the motor shaft will move from a half step Angle, stop in the middle of the adjacent two whole step position. The two phase coils of the two phase coils are rotated in such a circular manner and the two phase excitation stepper motors will rotate in half a step of each pulse. Subdivided driving The subdivision drive mode has two advantages of low speed vibration and high accuracy. It can be used in a step motor application that requires low speed or low positioning accuracy at a time. Its basic principle is to two of the motor coil respectively according to the steps of the sine and cosine shape precision current control, thus making a step away from the Angle of step distance is divided into several segments. As shown. For example, 8 subdivisions drive down the motor drive to receive 200 * 8 = 1600 pulse signal stepping into the motor.
System control: stepper motor can not work directly to the dc or ac power, must use a dedicated (12) using simple method to adjust two phase stepping motor rotation direction after the power supply, just put the motor and drive,
Stepping control principle of the drive can be divided into: analog control and digital control of two control modes, the simulation control is divided into hysteresis comparison and simulation PI control. Simulation control by the MCU have circular allocator function, to provide different perspectives on the stepper motor current waveform, and hysteresis comparison circuit and analog circuit to produce the corresponding Pi control pulse, realize the control of stepping motor. Digital control technology, mainly through the high performance DSP implementation of the stepper motor control, the basic principle is through the current and voltage sensor real-time sampling bus voltage and current of step motor, and then through the control algorithm can realize accurate control of the stepper motor. Analog control and digital control: the differences between digital control can effectively suppress the vibration of the stepping motor, noise and heat, especially under the condition of low segment, the performance of the digital stepper drive system can be very high. Innast electric's EZM, EZD, and EZN series drive systems are controlled by high performance 32DSP and are widely used in all kinds of automation equipment and instruments
The first; The step motor is widely used in the control system. It can transform the pulse signal into angular displacement, and can be used as an electromagnetic brake, electromagnetic differential, or angular displacement generator. Step into the motor drive selection guide One, step into the motor drive mode classification There are three basic types of stepper motor mode: whole, half step, subdivision. The main difference lies in the control precision of the motor coil current (that is, the excitation method). The whole step driver The same stepper motor can be matched with a full/half-step drive, but it works differently. Stepper motor drive/direction according to the pulse signal of two phase stepping motor two excitation coil cycle, will make the driving mode of each pulse motor moving from a basic step Angle, namely 1.8 degrees (standard two-phase motor circle of a total of 200 interval Angle).
