How To Choose Stepper Motor And Servo Motor For Printing Machinery

- Aug 07, 2018-

How to choose stepper motor and servo motor for printing machinery

The transmission structure of the printing machine includes only a linear motor, a rotary motor, a rotary motor, ect. Among them, linear motor control drive plate, origin switch and magnetic strip, read head and encoder. Rotate motor control brake pads, rotary encoders, boards, etc.

As the mechanization, electrification and automation of the production process continue to evolve, various types of motors have emerged. The working principle of these motors is generally the same as ordinary asynchronous motors and DC motors.The basic principles are similar, but they have their own special characteristics in performance, structure and production process, and are mostly used in the automatic control process. In general, the power of these motors is not large, only small fraction of a watt, and a large one is only a few tens of watts or hundreds of watts, which is a range of micromotors. Some belong to the category of stepper motors, and some belong to the category of servo motors. Today, this article discusses on the rapid development of printing machinery automation, should printing machinery choose stepper motor or servo motor?

Due to the rapid development of automation, standardization and dataization of printing machinery, there is an increasing demand for micromotors in printing machinery. Currently, a wide range of stepper motors and servos are used in printing equipment.

Three motors, electric motor and tachogenerator. This section details stepper motors and servo motors.

Stepper motor

Generally, the motor is continuously rotated, and the stepping motor is rotated step by step, so it is called a stepping motor. Each time a pulse signal is input, the motor rotates through a certain angle (some stepping motor can directly output line displacement, called a linear motor). Therefore, a stepping motor is an actuator that changes the pulse into an angular displacement (or linear displacement).

The rotor of the stepping motor has a multi-pole distribution. The stator is embedded with a multi-phase star-connected control winding. The electric pulse signal is input by a special power source. Each pulse signal is input, and the stepping motor rotor move a step further. Since the input is a pulse signal, the angular displacement of the output is intermittent, so it is also called a pulse motor.

With the development of digital control systems, the application of stepper motors in printing machinery will gradually expand. For example, in the CPCI control unit on the Heidelberg offset press in Germany, four sets of 36 steps are used to replace the original ink fountain screw.

Servo motor

The servo motor is also called the execution motor, or the control motor. In an automatic control system, a servo motor is an actuator that acts to change the signal (control voltage or phase) to mechanical displacement, that is, changing the received electrical signal to a certain rotational speed or angular displacement of the motor. Its capacity is generally 0.1-100W, and commonly used is 30W or less. Servo motor has DC and AC flow of the current, in the printing machinery AC and DC servo motor have applications, the most used are DC servo electric.

AC servo motor

The structure of the AC servo motor stator is basically similar to that of a capacitive split phase single-phase asynchronous motor. The stator is equipped with two windings with a position difference of 90°, and one is the field winding Rf, which is always connected to the AC voltage Uf; the other is the control winding L, coupled to the control signal voltage Uc. Therefore, the AC servo motor is also called two servo motors.

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