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The basic structure of CNC system
摘要：There are many kinds of numerical control systems in the world with different forms, and each has its own characteristics in structure. These structural features come from the basic requirements of system initial design and the engineering design ideas of hardware and software. For different manufacturers, based on historical development factors and the impact of complex factors vary from place to place, in the design of ideas may also be different.
There are many kinds of numerical control systems in the world with different forms, and each has its own characteristics in structure. These structural features come from the basic requirements of system initial design and the engineering design ideas of hardware and software. For different manufacturers, based on historical development factors and the impact of complex factors vary from place to place, in the design of ideas may also be different. For example, in the 1990s, the Dynapath system in the United States adopted a small plate structure with small thermal deformation to facilitate board replacement and flexible integration, while the FANUC system in Japan moved towards a large plate structure with fewer interplate connectors, make it conducive to the reliability of the system. However, no matter which kind of system, their basic principle and constitution are very similar. Generally, the whole CNC system consists of three parts, namely, control system, servo system and position measurement system. The hardware of the control system is a special computer system with input and output function. It sends control instructions to the servo drive system by interpolating the workpiece program The measuring system detects the position and speed of the linear and rotary motion of the machine, and feeds back to the control system and the servo drive system to modify the control instructions The servo drive system compares and adjusts the control instructions from the control system and the feedback information from the measurement system, and controls the PWM current to drive the servo motor. These three parts are combined to form a complete closed-loop control of the CNC system.
The hardware of the control system is a special computer with the function of human interaction and the ability of input and output including the fieldbus interface. Servo drive system mainly includes servo drive device and motor. The position measurement system mainly adopts the incremental displacement encoder with long grating or circular grating.
The hardware of the control system is a special computer with the function of human interaction and the ability of input and output including the fieldbus interface. Servo drive system mainly includes servo drive device and motor. The position measurement system mainly adopts the incremental displacement encoder with long grating or circular grating.
