The difference between a servomotor and a stepping motor
Two, low frequency characteristicsLow frequency vibration is easy to occur in stepping motors at low speeds. Vibration frequency is related to load and drive performance. Vibration frequency is generally considered as half of the no-load take-off frequency of motor. The low frequency vibration, which is determined by the working principle of the stepper motor, is very harmful to the normal operation of the machine. When stepping motor works at low speed, damping technology should be adopted to overcome low frequency vibration, such as adding damper on motor or subdividing technology on drive.AC servo motors operate very smoothly and do not vibrate even at low speeds. AC servo system has resonance suppression function, it can cover mechanical rigidity shortage, and the system has frequency analysis function (FFT), it can detect the resonance point of the machine, so that it is easy to adjust the system.
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.
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. 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.
I am very serious to say that the answer to the question of science should be answered with confidence. Do not mislead the questioner, and the answers of the above respondents are misleadingComparison of performance between stepping motor and AC servo motor
