DDC controlled servo motor
As large enterprises become more and more automated, the requirements for servo motors are also increasing. As an important component in automatic control systems, the reliability, accuracy and response speed of the motor directly affect the working performance of the control system. An important link that cannot be ignored. Therefore, the ddc of the servo motor has high application value and broad application prospects.
Traditional control method for servo motor
Since the externally given motor speed is analog, it is often necessary for the a/d module to convert the analog quantity into a digital quantity, and the servo motor driver receives the digital signal and then controls the motor operation. This traditional method of controlling a servo motor driver has a long application time. But its reliability is not high, there is a certain degree of zero drift. At the same time, considering the cost of the a/d module, the cost of this method is higher.
Direct digital control of servo motors
With the rapid upgrade of computers, Microsoft's development of Windows operating systems and visual programming tools such as: visual basic, visual c++, more and more industrial fields are using industrial computer for automatic control. Through the communication between the industrial computer and the lower computer, not only the operator is provided with a friendly human-machine interface, but also the operation is simple and easy to learn, and the reliability is no less than manual control.
The direct digital control of the servo motor directly uses the industrial computer to communicate with the driver. The industrial computer transmits the digital quantity to the servo motor driver through serial communication, thereby achieving the purpose of controlling the motor operation. Since the digital signal is directly controlled, the zero drift is eliminated, and the reliability is improved. Moreover, there is no need to convert analog quantities into digital quantities, eliminating the need to purchase a/d modules, which reduces costs. At present, servo motor drivers produced by many manufacturers are equipped with communication ports and communication protocols. The communication protocol is simple and reliable, and the user can conveniently complete the communication program. In this way, the motor can be directly controlled on the industrial computer, and various parameters can be easily modified according to the process requirements, thereby changing the speed of the motor and the like.
Applications
The ddc of the servo motor is applied to the sz twisted fiber-optic cable production line monitoring system, which uses the ACSA series AC servo motor driver of panasonic company. This series of drivers comes with a serial communication port and detailed communication protocol instructions. The industrial computer can communicate with the drive directly through its own com1, com2. The control requirements required by the monitoring system are: the motor can be controlled on the industrial computer so that the motor can accelerate and decelerate smoothly. Provides a friendly human-machine interface, easy to modify parameters, real-time display of the current state of the motor.
