Ac servo motor and the difference between ordinary motor ac servo motor with ordinary motor has a lot of difference

1,according to the different application field of the motor,there are many kinds of motor,ac servo

motor as part of the control.The basic concept of servo is accurate,precise,rapid positioning.The

structure of the servo motor and there is a difference between ordinary motor,with encoder feedback closed loop control,can satisfy the rapid response and accurate positioning.Now on the market circulation of ac servo motor for permanent magnet synchronous ac servo,the motor restricted by technology,it's hard to do a lot of power,more than 10 Kw synchronous servo motor price is very expensive,in such a field application,use ac induction servo motor,more often driven by frequency converter.2,material,structure and processing technology of the motor,ac servo motor is far higher than the single phase generator frequency inverter ac motor driven (general ac motor or constant torque and constant power and other kinds of variable frequency motor).When the servo driver output current,voltage,frequency change quickly,servo motor can produce a response action changes,response characteristic and resistance to overload ability is much higher than ac motor inverter drive.Of course not to say that the power of the inverter output is not changed so fast signal,but the machine itself can't reaction,when the internal algorithm of frequency converter set so did corresponding overload set in order to protect the motor.3,ac motor is generally divided into synchronous and asynchronous motor:(1),ac synchronous motor:is that the rotor is composed of permanent magnetic material,so after rotation,as the change of motor stator rotating magnetic field,rotor also do response frequency speed change,speed = stator and

rotor speed,so called "synchronous".(2),ac asynchronous motor,the rotor consists of induction coil

and the material.Cutting after rotation,the stator produce a rotating magnetic field,magnetic field

induction coil of stator,rotor winding induced current,then the rotor magnetic field is

induced,induced magnetic field to follow the change of the stator rotating magnetic field,but always

less than the change of the stator,the rotor's magnetic field change once is no changing magnetic

field cutting rotor induction coil,would be no induced current in the rotor winding,rotor magnetic

field disappeared,rotor stall with the stator produce speed difference again regaining induced

current...So in the ac asynchronous motor is a key parameter is the slip is the ratio of the speed of

the rotor and stator is poor.(3),the corresponding ac synchronous and asynchronous motor,frequency converter has the corresponding synchronous and asynchronous inverter frequency converter,www.facebook.com/guohong.trading servo motors are ac synchronous servo and ac asynchronous servo.Frequency converter in the ac asynchronous frequency common,of course,the servo ac synchronous servo common.

4,ac servo motor and general motors,and a lot of difference,you can refer to the "motor learning" books; General motor power usually is very large,especially large starting current,the current capacity of the servo drive induction motor sales can not meet the requirements.From the size of the motor can be knew why.About the application of the servo.There are a lot of aspects,even a small electromagnetic pressure regulating valve,can also include a servo system.Other servo applications such as artillery or radar,used as a follow-up,good real-time,fast dynamic response,small overshoot,precision in the second.If it is a machine,is often used as a constant speed,position accuracy and real-time demand is not 6.5hp gasoline generator set high.First have to make sure you apply in any occasion.If use on the machine tool,the control part of hardware we can design it is relatively simple,low cost accordingly.If used in military industry,the internal firmware design control algorithm should be more flexible,such as the position loop filter,speed loop filter,nonlinear,optimization or intelligent algorithms.Of course not be achieved on a hardware part.Can make several types of object oriented products.Ac servo in processing center,automatic lathe,electric injection molding machine,manipulator,printing machine,packaging machine,spring machine,three coordinate measuring instrument,electric spark machine,and so on aspects of the equipment has a wide application.About stepper motor and the performance of the ac servo motor has a larger difference.Stepper motor is a kind of discrete movement of the device,it has the nature of the contact and the modern digital control technology.In the current domestic digital control system,stepping motor is widely used.With the emergence of digital ac servo system,ac servo motors are increasingly used in the digital control system.In order to adapt to the development trend of

digital control,motion control system Mostly used in stepper motor or fully digital ac servo motor

as the executive motor.Although both similar on control mode (signal pulse sequence and

direction),but in the use of performance and applications where there is a big difference.Such

as:1,the system of different precision; 2,low frequency characteristics of different the torque-speed characteristic in 3,4,overload capacity of different 5,running performance different 6,speed response performance.Ac servo system in many performance is better than the stepping motor.But in some occasion not high demand also often use stepper motor to do perform motor.So,in the process of the design of the control system to a comprehensive,with consideration of many factors such as cost control requirements,choose the proper control motors.