MSMD082G1U price MSMD082G1U Matsushita Electric Matsushita Panasonic MSMD082G1U supplier Zhang Gong 182 019 88 309 QQ 8788 56 087 AC servo motor speed control principle with the advent of all-digital AC servo system, AC servo motors are increasingly used in digital control system. In order to meet the development trend of digital control, motion control systems are mostly all-digital AC servo motor as the execution of the motor. On the way to achieve the control pulse train and direction signals. Generally there are three servo control modes: Speed ??control, torque control, position control. Speed ??control and torque control is used to control analog. Position control is controlled by pulsing. Specific control methods should be adopted in accordance with customer requirements, meet to choose what kind of motor function. If you are the motor speed, position are not required, as long as a constant torque output, of course, is to use a torque mode. If you have a certain position and speed accuracy requirements, and real-time torque is not very concerned with the torque mode is not easy, with the speed or position mode is better. If the host controller has a better closed-loop control functions, with speed control the effect will be better. If in itself is not very high, or, basically no real-time requirements, with position control mode on the host controller does not have high demands. On the response speed of the servo drive, the minimum amount of torque mode operation, the control signal in response to the drive fastest; position of the maximum amount of computation mode, the drive for the slowest response to the control signal. Motion in a relatively high dynamic performance requirements, require real-time adjustment of the motor. So if the controller itself is very slow operation (eg PLC, or low-end motion controller), you control the position of the way. If the controller operation faster, you can use the speed mode, the position of the ring from the drive to the controller, the drive to reduce workload and improve efficiency (such as most of the high-end motion controller); if there is a better host control device can also be used to control torque mode, the speed loop is also removed from the drive, which generally only the high-end dedicated controller to do it, but this time completely without the use of servo motors. Put another way: 1, torque control: Torque control is to set the external output torque of the motor shaft size by assigning external analog input or directly address the specific performance of the corresponding words such as 10V 5Nm When set to 5V external analog output when the motor shaft is 2.5Nm: If the motor shaft when the load is less than 2.5Nm motor is transferred, the external load is equal to 2.5Nm motor does not turn, greater than 2.5Nm motor reversal (usually in generating gravity load case). You can change the setting of torque through an instant change in the size of the analog settings can also be changed by the value corresponding to the address of communication to achieve. The main application of the material in the force, there are strict requirements for winding and unwinding device, for example Rao line device or pull fiber optic equipment, torque is set according to the change in the winding radius change at any time in order to ensure that the material discontinuity will change with the change in the winding radius. 2, position control: Position control mode is generally determined by the size of the rotational speed of the pulse frequency of the external input to determine the angle of rotation by the number of pulses, some servo velocity and displacement can be assigned directly through communication. Since the position of patterns can have a very strict control over the speed and location, it is generally applied to the positioning device. Applications such as CNC machine tools, printing machinery and so on. 3, the speed pattern: passing frequency analog or pulse input rotational speed can be controlled, and when the upper outer loop PID control means controls the speed mode can be positioned, but has to be directly or position signal of the motor load The position feedback signal to the host to do computation. Position mode also supports direct load outer ring detection position signal, then the motor shaft encoder only detecting the motor speed, the position signal is provided by the direct final load end detecting means, the advantage is that it can reduce the intermediate transmission process error, increasing the positioning accuracy of the entire system.