SU840990A1 - Shaft angular position- to-code converter - Google Patents

Description

From the inputs of which is connected to the first comparator, and the outputs - to other comparators, a pulse generator connected via the frequency multiplier to the counting input of the first counter OR element connected to the counting input of the second counter, the outputs of which are connected to the control inputs of the multiplier, Triggers , the first. inputs of which are combined and connected to the installation input of the second counter and the output of the additional element I, the first input of which is connected to the outputs of the first comparator second input with the second output of the first about the trigger. contains And elements, the first inputs of which are connected to the outputs of the remaining comparators, the second to the outputs of the corresponding flip-flops, and the output of each of the elements And is connected to the input of the OR element and to the second input of the subsequent trigger H.

The disadvantages of this converter are low speed due to the fact that the maximum angle conversion time in a cyclic mode is equal to two periods of the supply voltage of the phase shifter, and its structure is rather complicated.

The purpose of the invention is to increase the speed and simplify the converter.

To achieve this goal, a shaft rotation angle converter into a code containing a multiphase power supply unit connected to a multiphase phase shifter, one of the inputs of which is connected to the input of the first comparator, and the outputs to the inputs of all comparators except the first, a pulse generator connected to the first. the input of the frequency multiplier, the output of which is connected to the counting input of the first counter, the OR element, the output of which is connected to the counting input of the iBToporo counter, the output of which is connected to the control input of the frequency multiplier, is entered into the AND element and the control trigger, the first input of which is connected to the output of the first of the coparator and q, o by the output of setting zero of the second counter, the second input is with the output of the last comparator, and the output is with the first input of the AND element, the second input of which is connected to the output of the OR element / and the output is with yn-v equal input of the first th counter, the outputs of all comparators, except lane Vågå, connected to the OR gate inputs.

FIG. 1 shows a flowchart of a converter; 2, timing diagrams of the formation of the reference and phase pulses.

The converter contains a multiphase power supply unit 1 connected to a multiphase phase shifter 2. In

In particular, a multiphase phase ejector consists of an angle sensor 3 in the form of a sine-cosine rotary transformer and a phase splitter 4 connected to the outputs of the angle sensor 3, to the input of which a sinus and cosine voltage is supplied from the multiphase power supply unit 1 of the angle sensor, the phase splitter produces a multi-phase voltage which is the output voltage of the multi-phase phase shifter

2. One of the inputs of the phase shifter 2 is connected to the comparator 5, and the outputs are connected to the comparators 6 b,. , . , 6 outputs of which are connected to the inputs of the element OR 7, in addition, the output of the last comparator 6 is connected by the second input of the control trigger 8. The first input of the control trigger 8 is connected to the output of the comparator 5 and to the installation input of the second counter 9, the counting input of which is connected to element OR 7

and to the first input of the element 10. The second input of the element 10 is connected to the output of the trigger 8. The output of the element 10 is connected to the second input of the first counter 11, to the counting input of which through the frequency multiplier 12 pulses are output from the generator 13 of the high frequency. The control inputs of the multiplier 12 are fed to the outputs of counter 9. If the number of phases at the output of the phase shifter is m 2, where P is an integer, the multiplier 12 is a binary multiplier.

The Converter angle of rotation of the shaft in the code works as follows

The multi-phase power supply unit 1 produces a sine and cosine voltage to power the angle sensor 3. Sine-wave voltage (1, Fig. 2 is taken as the reference. Sine-wave and cosine output voltages of the sensor

The angles, whose phase relative to the reference voltage depends on the angle of rotation of the sensor shaft, go to the phase splitter 4 of the phase shifter 2. At the output of the phase splitter 4, i.e.

at the output of the phase shifter 2, a multiphase voltage is formed, the phases of which are shifted relative to the reference

2l

Claims (3)

voltages at -i + Np, where m is the number of phases; i 0, l .... ml is the number of the output, F is the voltage phase corresponding to the angle of rotation pt .. In Fig. 2, the output signals of the phase shifter 2 are shown for m 8, F 120 and are denoted 2., 2, ... .2d. The comparator 5 from the reference voltage generates reference pulses (5 in Fig. 2) when the sinusoid passes through zero from negative values to positive ones. KoMnapaTOjftj 6, 6,. .. Sf, they form phase pulses from the output voltages of the phase shifter. 2 when going through zero from negative to positive values. In FIG. 2, the phase pulses for m 8, vp 120P are 6, 6g, ... 6g. The reference pulse is the beginning of m time intervals, each of which is proportional to -i + Pa, the ends of the time intervals, respectively, are phase pulses 6, 6, j,. . .br, If -i + Φ lit, then the value of the time interval should be determined from the reference to the second after the reference phase pulse. The ends of these time intervals are in the second period of the reference voltage after the reference pulse, therefore direct measurement of such intervals increases the conversion time. In such cases, the time interval from the reference to the first phase pulse can be used; in this case, add -V, 2lt 21s, i.e. - to the final result m of the transformation, since the sum of the time intervals must be divided by m for scaling. In this measurement of the time interval, all phase pulses used are in the interval of one period of the reference voltage. It is possible to reduce the conversion time. . The reference pulse (5 in Fig. 2) from the output of the comparator 5 switches the control trigger 8, sets the initial state, code 1110 for m 8, in counter 9 at the setup input. The same pulse can be used to set the counters 11 to their original state. Element I and Yu opens. The binary multiplier 12 starts to pulse the generator 13 to the input of counter 11, since its control inputs are supplied to the zero outputs of the bits of counter 9. This equals simultaneous multiplication and division by pt. Based on the diagram, it is necessary to add m time intervals, the duration from the reference pulse to the first phase pulse, and divide by τ, since the final result must be divided by the total number of time intervals for scaling. The first occurring phase pulse at the output of one of the comparators 6, bn, 6 through the element OR 7, the phase pulse will add one to counter 9, and after passing through the open element AND 10 to the contents of counter 11, at its second input adds code equal to -. After this, the number of pulses from the generator 13 output is reached by 21 multipliers 12 and is accumulated in counter 11, since the number of intervals from the end of the first time interval to the end of the second time interval is -1. The end of the second interval, through the element 10, again into counter 11, sets the following code in counter 9, and before the appearance of the third interval, counter 11 receives impulses, multiplied by 2. Each subsequent time interval decreases sequentially the multiplication factor The code in counter 11 is -. This continues until the appearance of a phase impulse from the output of the last comparator (DB 2). This impulse adds one to the counter 9, the last adds 2 “. The code is inserted into counter 11 and switches the control trigger 8 to the second input, closing element 10. The subsequent time intervals are equal to the true values, so correction is not required. The ends of the time intervals continue to decrease the multiplier of multiplier 12 by changing the code in counter 9, but adding the code in counter 11 is not performed. After passing the m ends of the time intervals in counter 9, a code (0001) is set so that the multiplier 12 stops the pulses from the generator output 13 to the counter 11. This completes the cycle of converting the angle to code. In counter 12, a code of a convertible angle accumulates, equal to the sum of the durations of all time intervals divided by the number of intervals, i.e. oi :: 1М (П1-1) + хр хр .. The value of the ГП (m-l) can be taken into account by first turning the shaft of the phase shifter or setting reference pulses in the counter llPQ in the additional code of the source state, which is equivalent to subtracting the value of Fc from the result. If a phase pulse from the output of comparator 6 appears first after the reference pulse, then the ends of all time intervals are within one period of the reference voltage, and the durations correspond to the true values. Nevertheless, an increase occurs in the meter 11 times the pulse the end of the time interval. By the end of the conversion, the code t - 2tfc is added, which, like the overflow of counter 11, does not affect the result of the conversion. In the proposed converter, the conversion is performed in one period of the reference voltage, while at a known maximum conversion time can reach two periods, the amount of equipment is reduced for each trigger and the I element, and one trigger is added to the entire device. The converter is simplified and, at the same time, all the accuracy advantages of the known converter are saved with. Claims of the shaft rotation angle converter into a code composed of a multiphase power supply unit connected to a multifunction phase shifter, one of the inputs of which is connected to the input of the first comparator, and the outputs to the inputs of all comparators except the first, a pulse generator connected to the first input of the multiplier frequency, the output of which is connected to the counting input of the first counter, the OR element, the output of which is connected to the counting input of the second counter, the output of which is connected to the control input of the frequency multiplier, which differs In order to increase speed and simplify the converter, an AND element and a control trigger are introduced into it, the first input of which is connected to the output of the first comparator and the installation input is the zero of the second counter, the second input is from the output of the last comparator, and the output from the first input of the AND element, the second input of which is connected to the output of the OR element, and a - to the control input of the first counter, the outputs of all the comparators, except the first, are connected to the inputs of the OR element. Sources of information taken into account in the examination 1.Certificate certificate CCXIP № 377844, cl. G 08 C 9/02, 11.01.71. 2. USSR author's certificate number 523435, cl. G 08 C 9/04, 02.07.75. 3. USSR author's certificate for application number 2666349, cl. G 08 C 9/00, 09/25/78. , Figg