[Introduction] odd this data introduces a principle that engine control pace advances electric machinery in detail the working principle of Deng Bujin electric machinery and odd a characteristic that engine control pace enters electric machinery. The pace enters electric machinery is digital control electric machinery, it turns pulse signal odd this data introduces a principle that engine control pace advances electric machinery in detail the working principle of Deng Bujin electric machinery and odd a characteristic that engine control pace enters electric machinery. The pace enters electric machinery is digital control electric machinery, it becomes pulse signal change angular displacement, give a pulse signal namely, the pace turns into electric machinery an angle, accordingly special agree with odd an engine control. The pace can be divided into electric machinery enter electric machinery and Composite pace to enter electric machinery to react type situation takes electric machinery, magneto step. The pace distinguishs the biggest characteristic at other control electric machinery into electric machinery is, it is to pass input pulse signal to have pilot, namely the total rotational angle of electric machinery counts a decision by input pulse, and the rotate speed of electric machinery is decided by pulse signal frequency. The fixed position that it has high accuracy, position and speed control, provide delicacy of fixed position retentivity, movement, open loop control to need not depend on sensor fixed position, medium tall torsion, high reliability, small-sized, high power is had to wait for a feature when low speed, make its have wide application. One, the pace enters electric machinery into the working principle pace of electric machinery is a kind of commonly used actuator in Electromechanical control, its utility is angular displacement of electric pulse translate into, its drive circuit works according to controlling signal, control signal by sheet piece machine generation. Receive signal of a pulse into driver when the pace, it presses the point of view that the direction of set turns one is secured into electric machinery with respect to drive pace, control commutation order, connect what electric control pulse must control each appearance strictly respectively according to certain order to be connected namely. Through controlling pulse number can be measured with controlling angular displacement, achieve the goal of exact location thereby. Control what the pace enters electric machinery to change direction, give working way namely foreword commutation electrify, the situation is turning into electric machinery, if press commutation of the electrify that oppose order, criterion electric machinery inverts. Control pace receives the rate of electric machinery, deliver pulse of a control into electric machinery to the pace namely, it turns one pace, reappearance a pulse, it can turn again one pace, the interval of two pulse is shorter, the situation turns more quickly into electric machinery. The speed that control electric machinery to turn at the same time through controlling pulse frequency and acceleration, achieve the goal of timing thereby. 2, this design adopts design plan 51 sheet piece machine AT89C51 (rate of brilliant Zhen Pin is 12MHZ) to 4 photographs 6 lines make a pace enter electric machinery (internal resistance 33 Europe, the pace is entered 1. 8 degrees, rated voltage 12V) undertake controlling. The has sequential square wave that outputs through I/O mouth receives the control signal of electric machinery as the pace, signal enters electric machinery through pace of chip ULN2003 drive. ULN2003 is Dalindu displays tall compression, big electric current, by 7 silicon NPN Dalindu is in charge of composition. Each pairs of Dalindu of ULN2003 establish ties 2.
The base resistor of 7K, it falls to be able to be linked together directly with TTL and CMOS circuit in the working voltage of 5V, OK and direct processing needs the data that standard logic bumper will come to handle formerly. ULN2003 job voltage is tall, working electric current is big, fill electric current can amount to 500mA, and can closing the voltage of 50V bears when voice, output still can run paralell in tall load current move. Form a pace to enter the drive circuit of electric machinery through ULN2003, if the graph is shown 1 times,circuit pursues. The 25-28 mouth of 51 receives the 1-4 of ULN2003 to input end. Additional, will undertake controlling to the condition of electric machinery with clavier, manage the rotate speed of indication electric machinery with the number, use 74LS164 to regard 2 single numbers as indication drive of the canal. 74LS164 takes a lock to put, use serial receive a standard resource of mouth of OK and managing I/O. If the graph is shown 2 times,its circuit pursues. Transmit data to CLK and DATA through the TXD of 51 and RXD mouth. Graph 1 51 is odd an engine control pace into plan of plan of electric machinery line 2 indication circuit pursue 3, anticipate the target will pursue 1 graph 2 join rise, made implementation: Press the key that start, electric machinery rotates, press add 1 key, rate increases, press decrease 1 key, speed is reduced, top speed is 100 turn / cent, lowermost rate is 25 turn / cent, press stop key, electric machinery stops turn. Rate value is shown on digital canal come. The plan that integrated above chooses, total flow is shown 3 times like the graph. Graph the step that last word of flow chart of 3 systems circuit devises enters implementation of instinct of electric machinery radical to expect an end, the course is debugged and revise, but still put in the problem, not stable circumstance can appear when pressing switch for instance, rotate speed compares chaos sometimes, show also have sometimes some not ideal, from the back work even if undertake modification in the respect such as software and hardware, expect an end with be being achieved completely. CNC Milling
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