489-P1-LO-A20-E Motor management relay basic unit

Embedded system is a special computer system with application as the center, computer technology as the basis, and the software and hardware can be reduced, which is suitable for the application system with strict requirements on function, reliability, cost, volume, power consumption, etc. [1]. Since the birth of the world’s first microprocessor designed for embedded applications in the 1970s, it has been decades of development. Now embedded system has become the most powerful branch of the electronic information industry. With the development of microelectronics technology, the application of embedded control system in intelligent and automatic industrial production is becoming more and more popular. In particular, with the large number of applications of mobile phones, pad, GSP, set-top boxes and other emerging products, the market of embedded systems is increasing at a rate of 30% per year, and the design of embedded systems has become a growing concern for software and hardware engineers. Stepper motor is a common executive component in industrial control, which has the advantages of flexible control and low price, so it is often used in many equipment and devices. The embedded stepper motor controller is to place the microprocessor in the motor controller, so that the stepper motor controller can provide the corresponding control logic according to the set number of phases, beats and steps taken by a single trigger pulse. 1. Working principle of stepper motor stepper motor is an electromechanical component that can convert electrical pulse signal into angular displacement or linear displacement. It is actually a single-phase or multi-phase synchronous motor. At present, there are three types of stepper motors in common use: reactive stepper motor (VR), permanent magnet stepper motor (PM) and hybrid stepper motor (HB). Now take the reactive three-phase stepping motor as an example to illustrate its working principle. There are six big teeth with the same shape on the stator core, and the included angle between two adjacent big teeth is 60o. Each big tooth is sleeved with a coil, two radially opposite coils are connected in series to form a winding, and there are several evenly distributed small teeth on the inner surface of each big tooth. The rotor is a cylindrical iron core, and the outer surface is evenly covered with small teeth in the circumferential direction. The pitch of the rotor teeth is the same as that of the stator. During the design, the number of rotor teeth can be divided by 2, but when a certain winding is energized and the rotor can rotate freely, each small tooth under the two large teeth of this phase will attract the similar rotor small teeth, so that the motor can rotate to the position where the rotor small teeth are aligned with the stator small teeth of this phase, while the small teeth under the large teeth of the other two phases must be staggered by 1/3 of the tooth pitch with the small teeth of the rotor, so as to form “tooth dislocation”, so as to form electromagnetic gravity to make the motor rotate continuously. The winding current of permanent magnet stepping motor and hybrid stepping motor requires forward and reverse flow, so the driving circuit is generally made of bipolar drive.

489-P1-LO-A20-E Motor management relay basic unit

Using the good man-machine interface and data processing ability of PC, PC is used as the man-machine interface of NC programming to check the syntax of NC programs and preprocess NC programs. After PC preprocessing, the NC program is downloaded to the motion controller, and LPC2214 stores the NC program in flash. During NC processing, LPC2214 reads the processing code from flash, decodes the NC processing program, and calls API functions after decoding to realize NC functions.
As the human-computer interaction interface of the CNC system, the upper PC can complete the functions of NC code editing (or receiving the processing program generated by cad/cam software), syntax checking and code preprocessing, and can communicate with the motion controller, upload the processed NC code parameters to the controller, and receive the (logic) position feedback and drive status information of the controller, so as to realize the monitoring of the whole system. The upper PC program is developed with Visual Basic.
After the basic software and hardware platform of motion controller has been established, the key point of realizing NC application is to convert NC code into API function calls, and the core content is to decode NC machining program.
Figure 3 decoding process of NC machining program
(1) Decoding of NC machining program.
Define a data structure cnccode buf to store the decoding results of a NC code line. G code and M code are divided into GA~GF and MX~my groups to save storage space and improve decoding efficiency.

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