Comparative analysis of AC servo motor applications

The dynamic control system not only develops rapidly in theory, but also changes in its application devices. Modular, digital, high-precision, long-life devices are available every three to five years. The traditional AC servo motor has soft characteristics, and its output characteristics are not single-valued; the stepping motor is generally open-loop control and cannot be accurately positioned. The motor itself has a speed resonance region, and the PWM speed control system has poor position tracking performance. The speed regulation is simple but the accuracy is sometimes insufficient. The DC motor servo system is widely used in the position following system because of its excellent performance, but it also has disadvantages, such as complicated structure, and the dead zone contradiction is prominent at the ultra-low speed, and the commutation Brushing can cause noise and maintenance problems. At present, the new permanent magnet AC servo motor develops rapidly, especially after the development from square wave control to sine wave control, the system performance is better, and its speed regulation range is wide, especially the low speed performance is superior.

For the motor motor power amplification part of the DC servo system frequently used on the radar, when the antenna is light in weight, slow in speed, and the driving power is small, it is generally several tens of watts, and the motor can be directly controlled by the DC power source. When the drive power requirement is above kW or kW, choosing the drive scheme, that is, amplifying the armature current of the DC motor, is an important part of designing the servo system. High-power DC power supplies are currently used in many: transistor amplifiers, thyristor amplifiers, and motor amplifiers. There are fewer uses for kilowatt-class transistor amplifiers. The thyristor technology was rapidly developed and widely used in the early 1960s and early 1970s. However, due to various reasons at the time, such as reliability, many products abandoned the thyristor control. Current integrated driver modules are typically fabricated as transistors or thyristors. The motor amplifier is a power amplifier device of the traditional DC servo motor. Because of its simple control and durability, the current new model of radar products is still used.

The AC servo motor is equipped with a special driver, which is much smaller in volume and weight than the same-power amplifier motor. It is based on an internal transistor or a thyristor switching circuit, which is judged by the photoelectric encoder or Hall device in the servo motor. The position of the rotor at that time determines the state of the corresponding output of the motor A, B, and C, so its efficiency and stability are good. Therefore, unlike the control amplifier motor, a special power amplifier circuit is required. Such motors are generally permanent magnet type, and the three-phase change current of the A, B, and C generated by the driver controls the rotation of the motor, so it is called an AC servo motor; the control signal input by the driver can be a pulse train or a DC voltage. The signal (generally ±10V), so it is also called DC brushless motor.

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