Application of servo motor in automatic control
1 Introduction
In recent years, it is obvious to all that the people's living standards are increasing and consumption is rising. With the recognition and the demand for their own quality of life, they are constantly being mentioned on the agenda. Consumers are not only concerned with the quality of internal materials. The requirements were put forward, and the corresponding requirements were also put forward on the packaging. This made the manufacturer have to upgrade its production equipment to speed up production and meet the needs of people with higher requirements, so the automatic numerical control equipment was introduced. Production, while servo motors are widely used.
According to the observations and development trends in recent years, the servo motor control technology is developing in the direction of digitization, intelligence, and communication. As a part of the CNC machine tool, as well as the actuator, what is the servo motor? Better use of major CNC machine tools? With the digital pulse width modulation technology, microelectronics technology, and the continuous advancement of current control technology, in the ever-changing process, a brief discussion on the technology, status quo and development trend of servo motors is made.
2. Introduction to servo motor
At present, in production, we usually use an AC servo motor, taking the AC servo motor as an example to analyze the composition of its structure.
The AC servo motor can be roughly divided into two parts, the rotor and the stator part. Among them, the squirrel-cage rotor and the non-magnetic cup-row rotor that we generally use are the rotor parts mentioned here. So what about the stator part? The commonly used stator structure has the same function as the stator of the resolver. They are composed of two-phase windings in which the space is 90 degrees apart in the stator core. Therefore, the servo motor can also be called a two-phase AC motor.
In the two common rotor structures, the squirrel-cage rotor AC servo motor consists of the rotor core, the rotating shaft and the rotor winding. The outer stator of the non-magnetic cup rotor AC servo motor is exactly the same as the squirrel-cage stator structure. There is a difference. It is made up of a ring of steel sheets. As part of the motor's magnetic circuit, the inner stator usually does not have windings, just replacing the core of the squirrel-cage rotor.
However, according to the current market situation, the squirrel-cage rotor servo motor is generally widely used, because the inertia of the non-magnetic cup rotor is small, and the bearing friction resistance torque is small. Also, because there are no cogging between the rotors, there is no cogging adhesion between the stator and the rotor. At constant speed, the phenomenon of jitter does not occur, but under the same volume and weight, with a certain In the power range, the cup rotor rotor servo motor has smaller starting torque and output power than the squirrel cage rotor servo motor. At the same time, the construction and manufacturing process of the cup rotor servo motor is relatively more complicated. Therefore, the cup rotor servo motor is only used in some occasions where it is required to operate very smoothly (eg, an integrating circuit).
