Description
The biggest characteristic element of AC servo motor is the servo mechanism. Can be called "servo motor", in addition to AC servo motor, there are DC servo motor and RC servo motor. The following explains their differences and characteristics, and briefly introduces the indispensable position/speed detection mechanism of servomechanism.
Advantages of DC servo motor:
(1) Small, light weight, high efficiency.
(2) Suitable for low voltage work.
(3) High efficiency/high power can be obtained by using high-performance permanent magnets.
(4) The system price of motor and servo amplifier is low.
(5) Through feedback, the basic performance such as rotation accuracy and positioning performance is very high.
Disadvantages of DC servo motor:
(1) To perform servo control according to the load.
(2) There is brush wear, need maintenance.
(3) Brush wear will produce dust, not suitable for clean environment.
(4) will produce mechanical and motor noise.
Coreless DC motor, many manufacturers use it for DC servo motor. The characteristics of coreless DC motor are as follows:
(1) The rotor inertia is small.
(2) The inductance of the motor coil is small and the rectification characteristics are good.
(3) No slot torque is generated.
Definition:
(1) Servo system: It is an automatic control system that enables the output of the position, orientation, and state of the object to change with any change in the input quantity (or given value).
(2) In the automatic control system, the system that can respond to the control signal with a certain accuracy is called the servo system, also known as the servo system.
The main task of servo is to amplify, transform and regulate the power according to the requirements of the control command, so that the torque, speed and position control of the output of the drive device are very flexible and convenient.
1.3 Classification and composition of servo system
Servo system according to the system structure can be divided into open loop servo system, closed loop servo system, semi-closed loop system, composite control system.
The closed-loop automatic control system with feedback is composed of position detection part, deviation amplification part, execution part and controlled object.
1.4 Performance requirements of the servo system Servo system must have good controllability, high stability and strong adaptability and other basic performance. To explain, good controllability means that after the signal disappears, it can stop itself immediately; High stability means that the torque decreases uniformly with the increase of speed; Strong adaptability means fast response, sensitivity and good sound quality. 1.5 Types of servo system Usually classified according to the type of servo drive, there are three types of electrical, hydraulic or electric-hydraulic. If the servo system is divided according to function, there are metering servo and power servo system; Analog servo and power servo system; Position servo and acceleration servo system, etc. Electrical servo system according to the electrical signal can be divided into DC servo system and AC AC servo system two categories. AC servo system has two kinds of asynchronous motor servo system and synchronous motor servo system. The servo system is mainly composed of upper computer, servo amplifier, motor, driver, command mechanism and other parts. Upper computer: give instructions to the servo. Servo amplifier: receive and process the instructions of the upper computer, control the motor rotation Angle and speed. The servo motor is the actuator. (The encoder of the servo motor feeds back the Angle and speed of the motor rotation to the servo amplifier, forming a closed loop to ensure accuracy.) The driver is the power source of the motor, and the command mechanism is to send pulses or speed servo drivers.
The company focuses on DCS, PLC, robot, large servo four systems
The main products are various modules/cards, controllers, touch screens, servo drivers
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