What is the difference between the servo system and the stepping system of woodworking engraving machine?
With the advent of full digital AC servo system, AC servo motor is also more and more used in digital control system. In order to adapt to the development trend of digital control, most of the motion control systems adopt stepping motor or full digital AC servo motor as executive motors. Although the two are similar in control mode (pulse train and directional signal), there are great differences in performance and application. The use of the two properties are compared.
Stepper motor is a discrete motion device, and it has an essential connection with modern digital control technology. In the domestic digital control system, the application of stepping motor is very extensive.
The step angle of two phase hybrid stepping motor is usually 3.6 degree and 1.8 degree, and the step angle of five phase hybrid stepping motor is usually 0.72 degree and 0.36 degree. There are also some high-performance stepping motors with smaller stepping angle. As a Stone Company for the production of the WEDM machine of the stepper motor, the step angle is 0.09 degrees; Germany bergerlahr company (BERGER LAHR) three-phase hybrid step motor production by the step angle dial switch is set to 1.8 degrees, 0.9 degrees, 0.72 degrees, 0.36 degrees, 0.18 degrees, 0.09 DEG and 0.072 DEG, 0.036 DEG, compatible with the step angle two-phase and five phase hybrid stepping motor.The control accuracy of the AC servo motor is guaranteed by the rotary encoder at the back of the motor shaft. Taking Panasonic digital AC servo motor as an example, for a motor with a standard 2500 line encoder, the pulse equivalent is 360 degrees /10000=0.036 degrees due to the adoption of the four octave technique in the drive. For a motor with a 17 bit encoder, the drive turns 217=131072 pulses per receiver, i.e., its pulse equivalent is 360 DEG /131072=9.89 sec. It is the pulse equivalent 1/655 of stepping motor with step angle of 1.8 degrees.
