 Analysis of the Application Scenarios of AC Servo Motor

Introduction to AC Servo Motor

The basic function of servo motor is accurate, precise and fast positioning. AC servo motor is like ordinary motor, composed of stator and rotor. There are two windings on the stator, excitation winding and control winding, and the two windings are 90 degrees apart in space.

The rotor inside the AC servo motor is a permanent magnet, and the three-phase electrical drive control forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the motor's encoder feeds back the signal to the driver, and the driver compares the feedback value with the target value to adjust the rotor's rotation angle. The accuracy of the servo motor depends on the accuracy of the encoder.

The working principle of AC servo motor and single-phase induction motor is essentially the same. However, AC servo motor must have a performance, which is to overcome the so-called "rotation" phenomenon of AC servo motor. That is, without control signal, it should not rotate, especially in the case of already rotating, if the control signal disappears, it should immediately stop rotating. But ordinary induction motors, once rotated, often continue to rotate even if the control signal disappears.

Application of AC Servo Motor

AC servo motors are widely used in ATM machines, inkjet printers, engraving machines, cameras, spraying equipment, medical equipment, computer peripherals and mass storage devices, precision instruments, industrial control systems, office automation, robots, electric vehicles and other fields.

Take electric vehicles as an example, one of the main applications of AC servo motor is the motor of the car. Some experts believe that "Permanent magnetization, digitalization and integration are the development trends of automotive drive motors." Digitalization is an inevitable trend in the development of motor drive technology.

Permanent magnet motors have the advantages of high power density and torque density, high efficiency, high power factor, high reliability, and easy maintenance.

Using vector control drive control system can make the permanent magnet motor have a wider speed range; integration has two aspects: one is the integration of the motor and the engine assembly, and the other is the integration of the power electronics assembly in the driver, including switch devices, circuits, control, sensors, power supplies, etc.

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