What is the difference between the "high-power DC servo motor" mentioned today and the AC servo motor that I have been exposed to in the past? It is important to note that the servo motor mentioned here is a DC servo motor. Since the previous technology was not so high, the servo motors produced were all AC. At this stage, new DC servo motors are emerging.
In the past, high-power servo motors have a much larger specification due to the power size, and the body weight is naturally heavier. However, the emergence of DC servo motors makes high-power DC servo motors have a non-proportional relationship between weight and volume, that is, the power of the motor is larger, but the volume and weight are much smaller. This is one of the reasons why DC servo motors can replace AC servo motors as the new and popular motors.
There are two main control methods of DC servo motors: one is excitation field control, that is, by changing the size of the excitation current to change the stator magnetic field strength, thereby controlling the motor speed and output torque. When the armature voltage control method is adopted, because the stator magnetic field remains unchanged, the armature current can reach the rated value, and the corresponding output torque can also reach the rated value, so this method is also called the constant torque speed regulation method; The other is armature voltage control, that is, when the stator magnetic field is constant, the motor speed and output torque are controlled by controlling the voltage signal applied to the two ends of the armature winding; while the excitation field control method is used, because the servo The magnetic field of the motor is close to saturation under rated operating conditions, so the speed of the servo motor can only be changed by weakening the magnetic field. Compared with the AC servo motor, the big advantage of the high-power DC servo motor is that it is easy to realize speed regulation and has high control accuracy.
Benefit 2: Small size, light weight, large output, fast response, high speed, small inertia, smooth rotation and stable torque. It is easy to realize intelligence, and its electronic commutation method is flexible, which can be square wave or sine wave. The maintenance-free DC servo motor has no carbon brush loss, high efficiency, low operating temperature, low noise, low electromagnetic radiation, long life, and can be used in various environments. The high-power Brake AC Gear Motors Suppliers of the Fujichi brand have a wide range of uses:
⑴ Actuator drive in various digital control systems.
⑵Power drives that need to accurately control the constant speed or need to accurately control the speed change curve
According to the inertia of the servo motor, it can be divided into:
⑴ Small inertia DC motor-automatic drilling machine for printed circuit boards
⑵Medium inertia DC motor (wide speed adjustable DC motor)-the feed system of CNC machine tools
⑶ Large inertia DC motor-the spindle motor of CNC machine tools Fujikaku Electromechanical produces high power DC servo motors.
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