SU809051A1 - Positional electric drive with mechanism displacement indication - Google Patents

Description

(54) POSITIONAL ELECTRIC DRIVE WITH MOTION MOVEMENT INDICATION The purpose of the invention is to increase the accuracy of speed H. To this end, the third, fourth, fifth pulse counters, second, third, fourth, fifth, and 1st, seventh, fifth, second trippers, filter, second and third pulse shaper, meter, misalignment signal, iervy, second, third OR elements, inverter, displacement meter and decoder, iric; uui output of the first trigger are sent across the second and three with the input of the unit and;: the wild and the first and second inputs of the displacement meter, connected via the third pulse counter to the third input of the digital-to-O1 converter, the third input of which is connected to the output of the first e, temuite OR., whose first input is through and subsequent The second key, the fourth HV, TbcoB and the third key are connected, and the second input is connected via the fourth key, the fifth pulse counter and the third key, respectively, to the output of the impulse generator, the second inputs of the third and the second Key through the second element OR connect with the outputs of the first trigger, the third output of the third key is connected to the first output of the second trigger, to the second input of the fourth key and the input of the second igniter, the output of which is connected to the second input of the fourth counter of impulses, the third output to connected to the second output of the second trigger, the second input of the second key and the input of the third driver imi.cheyov, the output of which is connected to the second input of the fourth key, the inputs of the second trigger connected to the first the second inputs of the first trigger, the output of the third pulse counter through the decoder is connected to the third input of the error sign meter, the first and second inputs of which are connected to the second amplifier input through a filter, the first and second outputs of the first imiuls counter are sequentially connected to the sixth key and the third OR element are connected to the fourth input of the display unit, the second input of the third element OR through the seventh key of the keys to the output of the first element OR, and the second input of the seventh key through the inverter chen to nerve enters the first pulse counter. Fig, I cited, the scheme of the device; Figs. 2 and 3 explain the principle of its effect. The device contains a frequency generator 1, a controllable frequency divider 2, a pulse counter 3, an indication unit 4, a switch 5, an adder, a pulse counter 7, a trigger 8, a filter 9, an amplifier 105, a motor 11, a mechanism position sensor 12, a pulse former 13, mismatch sign meter 14, position sensor power supply unit 15, k; 1U 16, pulse counter 17, shaper 18 imulis, keys 19 and 20, counter 21 imulse, shaper 22 pulses, key 23, OR element 24, digital-to-analog converter (D / A) 25 , inverter 26, element OR 27, keys 28 and 29, element OR 30, trigger 31, measure,: 32 32 magnitudes of displacement, counter 33 and m pulses, decoder 34, first 35 and radio 36, outputs 3, outputs 37 and 38 to pulse 28 and 29, output 39 of inverter 26; output 40 of the circuit OR 24; the output 41 of the counter 33. In addition, in FIG. accept the following about () ;. B is forward, H is back, ti, iz are the moments of giving the command to decrease and increase the speed tOj, respectively, Ti and Ta are the lag time for decreasing H-1I and increasing the speed, respectively, 5 is the specified amount of movement, and pulses at the output of the counter 7, b - i.mials on the В1,1khod for the world 13, Cie - B1 1khodn: Signal signals on the direct and inverse outputs of the trigger 31, e and t are the counter codes 17 and 21, respectively, g - output 1 aggregation CAI 25, E and F are the output signals of the trigger 8. The device operates as follows. In the initial state at the output 35 of the counter 3 - "O, the key 5 is open, the pulses fj from the controlled splitter 2 are frequencies to Bxo; i the adder --- subtractor b are not received, the output of the counter 7 is followed by PULSES where N is the counter capacity 7 ; : f is the frequency of the pulses at the output of the imager 13; The in-frequency of the supply voltage of the sensor 12. At both outputs E and F of the trigger keys 16 and 20 are closed, at the outputs of counters 17 and 21, the codes are zero, the output voltage of the DAC 25 is also equal. at the outputs of the end of the trigger 31, the output voltage corresponds to the diagrams of FIG. 2; at one of the outputs, the meter 14–1 (we assume at the output B), at the other (at the output H) - “O, B or H depends on what of the pulses a {or c) is ahead and, respectively, on which of the outputs E (or F) of the trigger 8 appeared "1, When the leading pulses a oo is" 1 at the output E, at the output B in the meter 14 appears "1 which remains at the single output of the decoder 34 until the occurrence of "1 at the output F of the trigger 8. When" O at the output of the decipher 34 (which corresponds to the presence of one unit in the counter 33) a change in the states of the outputs E and F of the flip-flop 8 does not affect the change of the sign of exem 14.

With the help of the coj and Sj task devices, the required speed values (dividing ratio of the controlled divider 2) and displacement (counter code 3) are set. In this case, the specified shift value is displayed on the display unit. The drive is started (key 5 is closed), the pulses of the task fj are fed to the input of the adder 6. At its output, taking into account:) the direction of movement is multiplied; the output frequency fp IV, the output of the splitter counter 7, pulses with the frequency ffl fp / N shift , ahead of the fe pulses at + fj and lag behind fg at f (Fig. 3). The time difference between the frequencies fo and fj is measured by trigger 8. This causes "1 at output E at -fo or output F at + f (in Fig. 2, graphs of the output signals of individual drive devices are shown for case -f} , which changes in a jump, while for the purpose of the discharge the change “.when the drive is moving) is not taken into account. When “1” appears at the output E of the trigger 8, depending on the state of the outputs c and d of the trigger 31, the key 16 opens (at “1 at the exit c) or the key 20 (at“ 1 at the exit d). Simultaneously with the occurrence of "1" at outputs c or d, counters 17 and 21 are zeroed through shapers 18 and 22. When key 16 is opened ("1 at outputs E of flip-flop 8 and flip-flop 31), the generator fr impulses 1 are counted. 19 is closed, and the key 23 is opened, the counter code 17 increases (the output from Figs. 1 and 2), the counter code 21 through the key 23 AND the OR element 24 arrives at the input of the DAC 25. The appearance of “1 at the output d (“ O at the output c) opens the keys 19 and 20 and closes the keys 16 and 23. The code e of the counter 17 through the key 19 and the element OR 24 is fed to the input of the DAC 25, and the code f of the counter 21 is incremented ( the pulse count fp of the generator 1) comes off. Codes to it counters 17 and 21 correspond to the time shift of the pulses fo and fg (OUTPUTS B AND a in Figs. 1 and 2).

FIG. 2 graphs of the output signals of the drive devices are given for three cases of drive operation: increase in f, decrease in fJ and f const (with a “-” sign). With an increase (time point ti), the output voltage of the DAC 25 (plot g in Fig. 2) changes from delay to time TI with decreasing ta (time point tj) THIS delay is Ta.

FIG. 2 for comparison, graphs are shown of the signals at the outputs of trigger 31 (plots c and d) and, respectively, at the outputs of counters 21 and 17 (plots e and f) and of the DAC 25 (plot g) for the case when trigger 31 is controlled by the generated pulses of the sensor fg. From these graphs it can be seen that in the second case the delay is greater both with increasing f, (time T |), and with decreasing f (time Tg). Thus, key management 16, 19,

20, 23 and counters 17 and 21 with a signal with a constant period (previously it was assumed for simplicity that f const) leads to an increase in the delay and, accordingly, a decrease in the drive speed. With a constant frequency fj, the time shift between them is constant and the output voltage of the DAC25 is also constant (plot g, fig. 2).

For large values of fj and small gain of the drive in terms of speed (Q), inconsistencies are possible that exceed one period fq (or fa). In this case, the millimeter (or sensor sensor) measurement circuit comes into operation, which only works when fe is changed.

5 or f and until the equality fo fe is restored ... With a large value of f (with a minus sign), it is possible that between two pulses with a frequency fu, two pulses of frequency fa are laid. (inputs a and b). In this case, the first pulse "and the trigger 31 is set to one state, preparing the passage of the second pulse", to the summing input of the counter. When the pulses "a (or" c) do not pass to the outputs of the counter.

When t decreases, a case occurs

when between pulses with frequency fq, two pulses with frequency fo are laid In the positioning mode after setting Sg and with and driving the drive, the pulses

0 f J through the key o is fed to the input of block 6, while the temporal mismatch between the impu, f and fe., Is increased, which is proportional to the value of ft and the quality factor of the drive. Simultaneously pulses f. arrive at the subtracting input of counter 3. The speed of the engine 11 varies along the OL curve (BC |. At the point AI, corresponding to a constant value fg, the mismatch between the pulses fo and f is proportional to the area OAAi corresponding to the acceleration path of the engine to coj. At point B The output 35 of the counter 3 appears, "Oh, the key 5 is disconnected, the pulses fj are not passed to the block 6, the engine 11 is braked, working off the mismatch. At the same time, the areas are equal,

5 i.e. equality of the acceleration and deceleration paths. At the same time, the occurrence “1 at the output 39 of the inverter 26 allows the passage of the codes e (or f) through the key 29 and the element OR 27 to the display unit 4. Considering that the braking time of the drive does not exceed 0.2

Claims (3)

0.3 s (in high-speed drives of metal-cutting machine tools this time does not exceed 0.1 s of maximum speed), switching the display unit from counter 3 to the output of the OR 24 circuit for the operator remains almost imperceptible. At the same time, the last bit of the display unit 4 does not show “0 (counter code 3 is equal to“ O), but the actual position of the sensor and, accordingly, the mechanism. When moving again, the operator can take into account the drive error, which in a number of cases reaches 3–4 sampling, but, as a rule, not more than 9. The proposed device is used in positional tracking electric drives with indication of the amount of movement. The economic effect of the introduction of a positional electric drive with movement indication is obtained by simplifying the circuit (eliminating clock devices), improving speed and, accordingly, positioning accuracy. Preliminary calculations show that the use of the proposed device allows reducing the machining time by 17%, which increases the productivity of machine tools up to 5-7%. The proposed positional electric drive can be used in the following systems of rolling mills and other mechanisms where precise positioning is required with indication of the amount of movement. The invention includes a positional drive with a movement indication of a mechanism containing a series-connected frequency generator, a controlled frequency divider, a first pulse counter and a display unit, the output of a controlled frequency divider is connected via a first key to the first input of the adder, the second input of which is connected to the output of the frequency generator, and the output - with the input of the second pulse counter connected to the first input of the first trigger, to the second input of which are connected in series the first photo world of pulses, position sensor mechanism, motor, amplifier, digital-analog converter, the second input of the position sensor mechanism through the power supply connected to the output of the frequency generator, characterized in that, in order to improve the accuracy and speed of the drive, it introduced the third, fourth, p second pulse counters, second, third, fourth, fifth, sixth, seventh keys, second trigger, filter, second and third pulse shaper, mismatch sign meter, first, second, third elements OR, inv ptor, displacement meter and decoder, the two outputs of the first flip-flop are connected via the error sign meter to the second and third inputs of the display unit and the first and second inputs of the displacement meter connected via the third pulse counter and the third input of the digital-to-analog converter, the third input of which is connected to the output of the first element OR, the first input of which through the second key connected in series, the fourth pulse counter and the third key, and the second input through The fourth key, the fifth pulse counter and the fifth key are connected directly to the output of the pulse generator; the second inputs of the third and fifth keys are connected via the second OR element to the outputs of the first trigger; the third output of the third key is connected to the first output of the second trigger; the fourth key and the input of the second pulse generator, the output of which is connected to the second input of the fourth pulse counter, the third output of the fifth key is connected to the second output of the second trigger, the second input of the second key and with the input of the third pulse generator, the output of which is connected to the second input of the fourth key, the inputs of the second trigger, are connected to the first and second inputs of the first trigger, the output of the third pulse counter is connected via the decoder to the third input of the error sign meter, the first and second inputs of which through the filter is connected to the second input of the amplifier, the first and second outputs of the first pulse counter are connected through the sixth key in series and the third element OR are connected to the fourth input of the indicator block tion, the second input of the third OR gate through the seventh switch connected to the output of the first OR gate and a second input key of the seventh through the inverter connected to the first input of the first pulse counter. Sources of information taken into account in the examination 1. V. Ratmirov. Fundamentals of software control of machines. "Engineering. 1978, p. 158, fig. 68 2. Yu. E. Mikheev, V. L. Sosonkina. Systems of automatic control of machine tools. 1978, p. 160-167, fig. 130. 3. Express information “Automated electric drive, issue. 31, 1975, p. 22-28.