The much axis pace that is based on fictitious instrument technology controls a system into electric machinery

Fictitious instrument and graph change programming language - LabVIEW fictitious instrument (namely Virtual Instrument, abbreviation NI) is a kind of instrument that is based on the computer, add on the general purpose computer namely software and (or) hardware, make when the person that use is operating this computer, seem the instrument of appropriative tradition electron that handling his him design. In fictitious instrument system, hardware is to solve the input of signal to output merely, software just is the key of whole apparatus system, the person that any is used can adopt the method of modification software, very conveniently the function of system of instrument of change, increase and decrease and dimensions, have so " software is an instrument " say. The occurrence of fictitious instrument technology, broke traditional instrument to be defined by manufacturer thoroughly, the pattern that the user cannot change, fictitious instrument technology gives an user the space of an ability that develops his adequately, imagination. User (is not manufacturer) can the follow one's inclinations demand according to oneself, design oneself instrument system, satisfy varied applied requirement. Fictitious instrument system is the child of all of computer science department and union of photograph of instrument system technology. It uses the environment of graphical process designing with PC powerful computer and online help function, combine corresponding hardware, build the fictitious instrument face plate of interactive interface quickly, analysis of the control that completes pair of instruments or installation, data and show, the function that improves an instrument and use efficiency, lower the price of the instrument substantially, make the user can need to define the function of the instrument according to his, undertake maintenance to its conveniently, patulous, upgrade etc. LabVIEW is American NI company uses fictitious instrument (32 when Virtual Instnlments) technology develops, main computer-oriented measure the fictitious instrument software that dominates a field to develop platform. LabVIEW also is to be planted one by one at the same time the graphical programming language with powerful function, but it and traditional text programming language (be like C language) different, used a kind of graph that is based on flow chart to change process designing form, because this also is called G language (Graphical Language) . The process designing form that this kind of graph changes, the engineer that went to the lavatory to be not software major weaves quickly program. LabVIEW also is different from the ordinal executive means of the programming language of traditional text type, used the executive means of data shedding however, the ability after this kind of means asks the program already obtained its full data in each node only is carried out. Much task is collateral processing is to pass multi-line Cheng technology to come true commonly, different job passes respective line Cheng to take up by turns actually CPU time piece will achieve " at the same time " the purpose of processing. LabVIEW also used multi-line Cheng technology, and compare with the programming language photograph of traditional text type, have two big advantages: LabVIEW comes out line Cheng complete abstraction, process designing person do not need to undertake founding to line Cheng, the operation such as cancel and synchronism; LabVIEW uses what the data that the graph converts flows to carry out means, when debugging a program accordingly, can see the collateral moving state of code very intuitionisticly, this makes process designing person the concept that understands much assignment very easily. LabVIEW graph changes what programming language used interface of current figure user effectively to click character. Write a program to include the following a few simple measure only: With the mouse choice instrument function serves as an object; The description checks the relationship between measure and object; Establish initiative condition. 2.

Motion controls motion to control card is one kind is based on a PC, use at all sorts of motion to control a circumstance (include displacement, speed, acceleration to wait) on position control is unit. Because,its occurrence basically is: Wait for a requirement to satisfy the standardization of system of new-style numerical control, flexible, open sex; Equip in all sorts of industry equipment, national defence (if dog location system) , in the automation control system of the equipment such as device of intelligent medical treatment is developed and be being transformed, be badly in need of a motion controlling the hardware platform of module; The PC wide application in all sorts of industry spots, also make the powerful function that provides corresponding control to get stuck to divide play PC in order to fill. Athletic control cartoon often uses professional sport to control chip or high speed DSP to control core as motion, use at controlling a pace to enter electric machinery or servo electric machinery mostly. Popularly, motion controls card and PC to form type of principal and subordinate to control a construction: The management that the PC is in charge of interactive interface and the job that command the respect such as real time monitoring of the system (for example of condition of the management of clavier and mouse, system show, athletic contrail program, control dictates send, the monitoring of exterior signal waits) a moment; Pilot of the control card campaign that finish is all detail (rise the output that comprises pulse and directional signal, automatically fall fast of the signal such as processing, origin and spacing detect wait) a moment. Athletic control card deserves to open function library offers an user to leave the control system that proper motion development, tectonic place wants in corresponding system platform. The athletic control check that consequently this kind of structure opens can apply at each domains of automation of the equipment in manufacturing industry widely. The pace enters electric machinery is a kind of actuator angular displacement of electric pulse translate into. Receive signal of a pulse into driver when the pace, the angle that the direction that it presses set into electric machinery with respect to drive pace turns one is secured (call " step pitch horn " ) , with fixed angle one pace runs its whirl. Can pass control pulse number will control angular displacement amount, achieve the goal of exact location thereby; Can control the speed with rotational electric machinery and acceleration at the same time through controlling pulse frequency, achieve the goal of timing thereby. The pace can regard a kind of control as used special type electric machinery into electric machinery, because have rotor inertia,the pace enters electric machinery precision of low, fixed position is tall, without accumulate error, control to wait for a characteristic simply, became one of main executive element that control a system. The pace includes open loop control and closed-loop control into the control method of electric machinery two kinds. 2, the pace that is based on fictitious instrument controls systematic whole structure and principle into electric machinery system of general campaign control basically forms by 5 parts: The motor of I/O of the mechanical equipment that is moved, motion (servo or pace are entered) , controller of motion of motor driving unit, intelligence, and process designing / operation interface software. The target of this system is to use author lab to already had company of American state apparatus (the servo of NI PCI 7354 of NI) / the pace controls card and software of its form a complete set, NI 7604 servo into motion / the pace enters pace of driver and software of its form a complete set, two-phase to enter nicety of software of electric machinery, LabVIEW, much axis, realize the athletic control of odd axis, two axes, 3 axes and four-axle respectively, requirement system has the basic function of numerical control system, the function such as drive of control of the interpolation of linear, circular arc that can realize different coordinate department to fall, speed, electron, in order to offer experimental education application. If block diagram of systematic whole structure pursues 1 show. Graph block diagram of structure of 1 system whole 1.

Motion of NI PCI 7354 controls calorie of NI PCI 7354 to control card to be able to dominate the 4 axes campaign that includes communication and pace to enter electric machinery at the same time, can realize such as to choose bit of place three-dimensional and control, speed control, linear, circular arc, helix mix with drive of globose motion, electron, mixture motion, return trip the function such as input of spacing control, Trigger and Breakpoint output. Of NI PCI 7354 embedded firmware is to be based on RT0S(real time operating system) of the kernel, real time sex is strong, move through what use easily simply controller, software, and the function that peripheral offers compositive program and ability, provide accurate, high-powered motion function into application for general servo and pace. This motion controller can use the LabVIEW that supports Windows 2000/NT/Me/xp operating system, Measurement Studio(LabWindows/CVI, Visual Basic) and C/C++ to undertake process designing. Card of control of sport of NI PCI 7354 is high-powered PCI pace is entered / servo controller, can use in system of all sport control, controller uses advanced technology, in embedded the circle that mixture motion offers to orbit is controlled and cooperate with completely in the process designing environment that real time moves or is a center with lead plane, linear, dot arrives dot, gear and dimensional vector control. Its rich function can satisfy most strict requirement. Motion of NI PCI 7354 controls the main characteristic of card: Through PCI bus line and lead plane (go up a machine) communication; 68 core VHDCI outputs cable; Average number outputs voltage: 0-32V; Tall n 3.

5--30V, low n 0, 2V; Rate of the biggest pulse: 100KHZ; Moving electric current: 3-14mA; Spark output rate of the biggest pulse: 1MHz; 2.

Athletic control software uses NI LabVIEW graph to change programming language and all sorts of application software can develop the movement with powerful function to control a process, athletic controller deploys the LabVIEW VI that NI-Motion drive software offers, firmware to replace program, DLL program, can use other to develop a tool (for instance Measurement Studio, labWindows CVI) or campaign of development of other programming language control application. NI campaign aide (Motion Assistant) is an add tool that uses LabVIEW code to create a method, use this tool you need to undertake few process designing only even need not process designing can develop LabVIEW motion to control application. 3.

The four-axle campaign that driver of NI 7604 of NI 7604 driver provides NI 7354 controls signal enlarge, run into electric machinery with drive two-phase pace, drive accurate report to move a motion. This driver will move controller and specific application motor, coder, spacing implement, user I/O joins together. One controls controller of cable join motion and drive, for total order collect and feedback signal offer a channel. The main characteristic of NI 7604: Input voltage: 115V/23V, 2/1A, 60/50Hz; The pace enters amplifier: IM481H; Every phase current: 0.

2, 1.

4A; Power source outputs a capacity continuously: 80W; Input cable: 68 core VHDCI; Output voltage: 24V DC; + 5V output: 1A. 4.

Pace of two-phase of athletic control peripheral enters electric machinery 4, four-axle essence cipher telegram moves stage, report moves the stage is ball guide screw / nut drive structure. If systematic principle graph pursues 2 show. Graph 2 systems principle pursues 3, systematic work principle is passed go up a machine (PC) the target position that data terminal unit sets a pace to enter electric machinery, acceleration, speed and decelerate are spent (give out motion to control task) namely, the athletic time that control of NI PCI7354 sport blocks to dominate electric machinery according to installing information (output pulse several) with direction, control motion of calorie of the real time that finish to plan namely, NI 7604 driver magnifies pulse signal runs with drive electric machinery. In electric machinery moving process, the frequency F that controls pulse should change to reach the need that high speed runs with stopping since low speed of contented electric machinery at any time. Pulse frequency is led by the baud that transmits data (B) decision, every give out a pulse to need to use two binary digit 1 and 0 will form its tall, low n, so F ＝ B/2, lead the frequency of the control pulse that gives out convertibly through adjusting the baud that transmits data. The change of control pulse frequency that when by groovy baud rate series transmits data, produces is bigger, cannot satisfy electric machinery to rise normally stay the demand that reachs timing, need to press nonstandard baud rate to transmit data for this computer in order to produce the control pulse of aleatoric frequency. Start in electric machinery commonly reach stop level every send a byte to adjust baud rate, stop in order to make electric machinery rises as far as possible flowing. 4, software research and implementation are built in compose of systematic hardware link after finishing, finished odd axis stage by stage early or late the software of system of spatial motion control studies control of sport of plane of sharp movement control, two axes, 3 axes with development. Control software uses LabVIEW 7 design of platform of development of software of this kind of fictitious instrument, the face plate before every program cent is and block diagram program two parts. Face plate is used at setting control parameter and indication control process and kill before, block diagram program is the code of the program. If the face plate before helix of two axes plane moves pursues 3 show, program of block diagram of motion of helix of two axes plane (local) if pursue 4 show. Graph the face plate before helix motion controls plane of 3 two axes pursues program of block diagram of control of sport of helix of plane of 4 two axes (local) 3 axes of spatial motion before face plate and block diagram program (local) be like a graph respectively 5, the graph is shown 6 times. Graph the face plate before motion of 5 3 axes is controlled pursues program of block diagram of control of sport of 6 3 axes (local) 5, epilogue test result makes clear, this pace controls systematic function into electric machinery good, the job is reliable. Deserve to go up the position can come true after the man-machine interface of a variety of functions (start and eye punctuation) , the speed, acceleration, visible operation that reduces speed to wait and control, through changing the target position with online laden change, the energy that can achieve the position decides position control, through online adjust speed and add / the cost that reduces rate, can achieve the goal of fast timing. Realized open loop much axle control at present, take the closed-loop control of electric machinery in view of the pace, the much axis campaign that the author plans to study the pace takes electric machinery closed-loop control further controls a system. CNC Milling