How does the servo motor work?

Servo motor , also known as the implementation of the motor, is the servo system to control the operation of mechanical components of the engine, is a subsidy motor indirect transmission. It can make the control speed, position accuracy is very accurate, the voltage signal can be converted into torque and speed to drive the control object. The servo motor can be divided into DC servo motor and AC servo motor.
AC servo motor is also composed of stator and rotor. The structure of the stator is basically similar to that of a capacitive phase split single-phase asynchronous motor with two windings of 90 ° different from each other, one for the field winding Rf, which is always connected to the AC voltage Uf; Control winding L, connection control signal voltage Uc. So AC servo motor, also known as two servo motor.  
The rotor inside the servo motor is a permanent magnet, the driver controls the U / V / W three-phase electric field to form an electromagnetic field, the rotor rotates under the action of the magnetic field, and the motor comes with the encoder feedback signal to the Servo driver, it according to the feedback value and the target Value to compare, adjust the rotor rotation angle.
The working principle of the AC servo motor is similar to that of the two-phase asynchronous motor. But because it is in the CNC machine tool as an actuator, the AC signal is converted to the axis of the angular displacement or angular velocity, so the speed of the rotor speed can reflect the control signal phase, no control signal when it does not rotate.  

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AC Servo Motor and Drive – Servo Systems – Fasttobuy

Servo system (AC Servo motor and driver) is used to accurately follow or reproduce a process of feedback control system.Servo systems are an important part of industrial control.


How to control the operation of the machine, those who work professional engineers will know how to operate, for those non-professional people, so, how do we choose the servo motor.


Servo motor has a lot of important parameters, we look through the table to see what important parameters.

servo motor parameter

When we choose the servo, we must first determine the flange,Common flange specifications are: Servo Motor nema24 nema32 nema34 nema52.If you do not need these routine, then you have to customize.As a result, your budget may increase.


Commonly used servo motor power generally have:400w 0.75kw 1kw and 1.5kw

Servo motor power is a variable value, the servo motor low-speed low-power, high-speed high-power.When the speed of the servo motor changes, the rated torque is constant and the rated power increases with speed.


In general, the rated speed of the servo is about 2000 to 3000 rpm,

During the operation of the servo motor, the large current means high torque, the size of the control current, can control the size of the torque.


Finally, you need the main motor voltage is 220V or 380V.


AC Servo motor and driver are widely used in the fields of inkjet printers, lettering machines, pictorial machines, spraying equipment, medical equipment and equipment, computer peripherals and mass storage devices, precision instruments, industrial control systems, office automation, robots and so on. Also in the computer embroidery machine and other textile machinery and equipment has a wide range of applications.


Fasttobuy LTD specializes in industrial automation field. The main products include industrial Servo  and accessories, industrial communication device, industrial network, on-site control, instruments, industrial electronic components, .etc. We mainly distribute and wholesale the servo and stepper and system .Such as leadshine TOAUTO Delta Yaskawa Mitsubishi


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Why AC servo motor need a drive

Some time ago, a few students asked me why the AC servo motor needs drive? At that time, I told them at that time.

We know that there are many parameters of the servo motor, such as speed, torque, position and so on.

In order to make it easier to understand, I am here to give an example. AC motor speed is generally 1000 to 3000 r / min, the general power supply is 220V, or 380V, 50Hz, such as Delta AC servo motor, , but sometimes we do not want the motor speed is always the same, so we can change the frequency of the motor to change the way Of the rotational speed. Then we need to be accompanied by such a device to control the motor speed.

AC servo motor and drive kit

Servo motor control is very complex, Such as :Leadshine AC servo motor need to change the frequency, voltage, current, in order to achieve the motor speed, torque, position of the overall control, servo drive is used for this purpose. Servo motor is only responsible for how much you give me the frequency, voltage, I will do the appropriate thing. Frequency, voltage changes, the direction of change, etc. are responsible for changes by the servo controller.

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