In the case of speed control and torque control, the general-purpose inverter is not very high, and the position feedback signal is added in the upper position to form a closed-loop frequency conversion for position control, and the accuracy and response are not high. Some existing frequency conversions also accept the pulse sequence signal to control the speed, but it seems that the position cannot be directly controlled. “The response speed of the servo is much greater than the frequency conversion,†Household Electrical Appliances gree , https://www.greegroups.com
In the case of strict position control requirements, only servo can be used, and the response speed of the servo is much larger than the frequency conversion. Some speed control and high response requirements also use servo control, which can be controlled by frequency conversion. The occasion can almost be replaced by a servo.
The key is two points: First, the price servo is much higher than the frequency conversion, and the second is the reason of the power: the maximum frequency can be hundreds of kW, or even higher, and the servo is tens of kW. The basic concept of servo is accurate, accurate and fast positioning. Frequency conversion is a necessary internal link of servo control, and there is also frequency conversion in the servo drive (for stepless speed regulation).
1. Motion control, no matter what method you use, the physical mechanism that restricts the response speed is the same;
2. There is no system that transcends this physical mechanism;
3. This physical mechanism can be simply attributed to the impulse theorem:
Force (or moment) × action time = change of inertia × speed of moving body
4. Saying that "the corresponding speed of the servo is much greater than the frequency conversion" is a statement without physical mechanics support, and it cannot be trusted;
1. The physical mechanism of motion control is:
Force (or moment) × action time = change of inertia × speed of moving body
2. The response time of motion control is the action time of force or moment. The shorter this time, the faster the response speed of motion control is;
3. Then, in the case where the "movement of inertia × speed change" is constant, the force (or moment) is inversely proportional to the action time;
4. For example, the response time of motion control is as short as 1/10 of the original, which means that the force (or torque) is increased by 10 times;
5, I would like to ask, the servo motor and asynchronous motor principle and performance, servo controller and inverter control principle, the force (or torque) will be much different?