Servo motors , as the mainstream motor-driven machines in the electronics industry, are widely used. Since their inception, they have been considered to be expected to replace stepper motors, which will inevitably bring many related problems in the development process. Therefore, this article will collect the questions on the platform and answer them. , I hope it will help you guys.

　　1. What is a servo motor ? How many types are there? What are the working characteristics?

　　Servo motors, also known as executive motors, are used as executive elements in automatic control systems to convert the received electrical signals into angular displacement or angular velocity output on the motor shaft. It is divided into two categories: DC and AC servo motors. Its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the speed decreases uniformly with the increase of torque.

　　2. What is the use of the rotor of the servo motor?

　　The rotor inside the servo motor is a permanent magnet. The UNN three-phase electricity controlled by the driver forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the encoder that comes with the motor feeds back the signal to the driver. The driver compares the feedback value with the target value. Adjust the angle of rotation of the rotor. The accuracy of the servo motor is determined by the accuracy (number of lines) of the encoder.

　　3. The difference between AC servo motor and brushless DC servo motor

　　The AC servo is better, because the ball screw is controlled by a sine wave, and the torque ripple is small. DC servos are trapezoidal waves. But DC servo is simpler and cheaper. Permanent magnet AC servo motor Since the 1980s, with the development of integrated circuits, power electronics technology and AC variable speed drive technology, permanent magnet AC servo drive technology has achieved outstanding development, and famous electrical manufacturers in various countries have successively launched their own AC servo motors. Motor and servo drive series products are continuously improved and updated. The AC servo system has become the main development direction of the contemporary high-performance servo system, which makes the original DC servo face the crisis of being eliminated. After the 1990s, the AC servo system that has been commercialized in various countries in the world is driven by a sine wave motor servo drive with full digital control. The development of AC and service drives in the field of transmission is changing with each passing day.

　　4. Comparison of permanent magnet AC servo motor and DC servo motor

　　The main advantages of permanent magnet AC servo motors are as follows:

　　① No brushes and steering gears, so the work is reliable, and the maintenance and maintenance requirements are low;

　　② It is more convenient for stator winding to dissipate heat;

　　③ Small inertia, easy to improve the rapidity of the system bellows coupling;

　　④ Suitable for high-speed and high-torque working conditions;

　　⑤ It has smaller volume and weight under the same power.