Application scenario of servo motor

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The basic function of servo is accurate, precise and fast positioning. AC servo motor is composed of stator and rotor as common motor. There are two windings on the stator, namely excitation winding and control winding. The two windings are separated by 90 degrees in space. The rotor inside the servo motor is a permanent magnet, and the three-phase electric drive control forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the encoder of the motor feeds back the signal to the driver, and the driver compares the feedback value with the target value to adjust the rotation angle of the rotor. The accuracy of servo motor depends on the accuracy of encoder.

There is no essential difference between the working principle of AC servo motor and single-phase induction motor. However, the AC servo motor must have a performance that can overcome the so-called "rotation" phenomenon of the AC servo motor, that is, it should not rotate without the control signal, especially when it is already rotating, if the control signal disappears, it should immediately stop rotating. However, after the ordinary induction motor rotates, if the control signal disappears, it will often continue to rotate.

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

Take electric vehicle as an example, one of the main applications of servo motor is automobile motor. Some experts believe that "permanent magnetization, digitization and integration are the development trend of automobile drive motors." Digitalization is the inevitable trend of motor drive technology development. Permanent magnet motor has the advantages of high power density and torque density, high efficiency, high power factor, high reliability and easy maintenance. The vector control drive control system can make the permanent magnet motor have a wide speed range; There are two aspects of integration: one is the integration of motor and engine assembly, and the other is the integration of power electronic assembly in the driver, including the integration of switching devices, circuits, control, sensors, power supplies, etc.