What is the difference between stepping motor and servo motor and three-phase asynchronous motor? What are the advantages of their differences?
Stepper motor principle: stepper motor is a kind of electric pulse into angular displacement of the implementation of the mechanism. Generally speaking, when the stepping driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle (and step angle) in the set direction. We can control the angular displacement by controlling the number of pulses, so as to achieve the purpose of accurate positioning. At the same time, we can control the speed and acceleration of motor rotation by controlling the pulse frequency, so as to achieve the purpose of speed regulation.Advantages: as a digital input, the motor accuracy has been greatly improved, speed and acceleration control is easy to achieve, and the control effect is better.
Principle: when the asynchronous motor, the motor stator windings of AC, will produce a rotating magnetic field, the rotating magnetic field cutting rotor windings, thus the induced current in the rotor winding, the rotor conductor ampacity will produce electromagnetic force in the stator rotating magnetic field, so as to form the electromagnetic torque of the rotating shaft of the motor and drive motor rotate, and the rotation direction of the motor and the rotating magnetic field of the same direction. As the rotor of asynchronous motor and stator rotating magnetic field in the same direction, different rotating speed, there is a slip, so called asynchronous motor.AdvantageCompared with other motors, the utility model has the advantages of simple structure, convenient manufacture, good operation performance, and various material saving and low cost.shortcomingPower factor hysteresis, light load, low power factor, poor speed regulation performance.
Servo motor servo motor principle: also known as the executive motor, DC and AC servo motor is divided into two categories, servo motor rotor is permanent magnet drive control of the U/V/W three-phase power electromagnetic fields, the rotation of the rotor in the magnetic field, at the same time with the motor encoder feedback signal to the drive, the drive according to the feedback value compared with the target value, the rotor rotation angle adjustment. The accuracy of the servo motor is determined by the accuracy of the encoder (line number).Advantages: as servo motor with motor encoder to form an internal closed loop, the control accuracy is very high, so that it can operate normally at high speed. The drive can communicate directly with the host computer.Disadvantages: high price, long supply cycle of imported goods, high maintenance costs.
