In 1978, the Indramat branch of Rexroth Company of MANNESMANN, Germany launched the MAC permanent magnet AC servo motor and drive system at the 1978 Hannover Trade Fair, marking that this new generation of AC servo technology has entered the practical stage. After years of development, servo motors have been applied to all walks of life. How much do you know about it? Let's get to know it together.
Servo motor, also known as executive motor, refers to an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device. Its internal rotor is a permanent magnet, and the U/V/W three-phase electricity controlled by the driver forms an electromagnetic field. , the rotor rotates under the action of the magnetic field, and the compiler that comes with the motor feeds back the signal to the driver.
What is the working principle of a servo motor? This requires us to first understand the servo system, which is a control feedback system used to follow or reproduce a process. The servo system enables the position, orientation, state and other output controlled quantities of the object to follow the arbitrary change of the input target (or given value), and is widely used in the fields of wireless control, automatic lathes, ships, military and national defense. application.
The servo system mainly relies on pulses for positioning. When the servo motor receives a pulse, it will rotate by an angle of the pulse, thereby realizing the movement of the position. The servo motor can send out pulses, and every time it rotates to an angle, it will send out a pulse. Corresponding pulses, the system can accurately record the sent and received pulses, so as to precisely control the rotation of the motor, the minimum can reach 0.001 mm.
At present, there are two types of servo motors: DC and AC. The output speed of the DC servo motor is inversely proportional to the input voltage, and realizes forward and reverse speed control. It has the advantages of large starting torque, wide speed regulation range, good mechanical and regulatory linearity, and easy control.
AC servo motors are divided into two types: synchronous and asynchronous motors. At present, synchronous motors are more commonly used in motion control. They have the advantages of a large power range and decrease rapidly as the power increases. Therefore, it is suitable for smooth operation at low speed.
Because of the sine wave control, the AC servo motor has the advantages of small torque ripple, stability and reliability, low maintenance cost, and easy to improve the rapidity of the system, which is more excellent than the DC motor. The AC servo motor sold by Xinli Electric Co., Ltd. not only has a reasonable price, but also has a small starting current, can be started frequently, and does not require variable frequency starting, which can meet various needs.
