Does The AC Servo Motor Can Work Without Servo Driver?

- Mar 05, 2019-

Does the AC servo motor can work without servo driver?


AC servo motor does not work without a servo drive.

But does not mean that the servo motor can not move. Active, but can not normally drive the production unit work.

The servo system includes a servo amplifier, servo motor and controller of its feedback device.

So how do the servo systems that make up these devices work together?

The servo controller sends the position, velocity, and low voltage control signals to the servo amplifier. The servo amplifier amplifies these commands to high power and then sends them back to the amplifier through an electrical pulse from the sensor. The amplifier uses this information to control the speed and rotor position. The application of the servo motor system is also known as the motion controller. The servo system integrated into one unit continuously transmits the motor parameters by interacting with the data of the servo amplifier, so that the position and speed of the motor can be adjusted in real time.


Some manufacturers offer modules combined with controllers and amplifiers, which also reduces the overall component volume, which means that the AC servo motor means a three-phase synchronous motor that transforms into a permanent magnet motor, so you get a very powerful And a suffocating small volume motor. 

The rotational speed and force of the rotating magnetic field generated by the stator windings are controlled by the amplifier and the controller. In order to quickly locate the position, these motors must have a low moment of inertia, and the servo motor is generally required to have an elongated shape. 


The working principle of the servo motor: The servo mechanism is an automatic control system that allows the output control of the object to follow any change in the input target (or set value). The servo is mainly positioned by pulse. Basically, it can be understood that when the servo motor receives one pulse, it will rotate the angle corresponding to one pulse to realize the displacement.


Because the servo motor itself has the function of emitting pulses, each time the servo motor rotates, a corresponding number of pulses will be emitted, so that the pulse received by the servo motor forms an echo, or a closed loop, so that the system will know How many pulses are sent to the servo motor, and how many pulses are returned at the same time, so that the rotation of the motor can be precisely controlled to achieve accurate positioning, which can reach 0.001 mm.

Therefore, the servo motor is driven by the encoder signal given by the driver. If there is no drive, there is no closed loop, which obviously does not work.


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