SU556476A1 - Angular displacement transducer to code - Google Patents

Description

parators 7, elements AND 8 and OR 9, 10, switches 11, comparators 12 and 13, valve 14, "control unit 15, trigger 16, key element 17, pulse generator 18, counter 19, Code converter 20, which includes t valves 21, 22 and elements OR 23, and a digital reading device 24.

The Converter operates as follows.

From the output of selsyn 2, the stresses of the form

iIi-kU ,, smwtsmB; () 2fsm (8-120); (1)

from Ш, шЫ sin (Э - 240),

where C / d and yes are the ad-slit value and the circular frequency of the voltage t / n of source 1;

in - the angle of rotation of the rosin selsyn; k is a transformation coefficient constant for a given type of selsyn (const).

Voltages from the output of the selsyn and the voltage f / n of the source 1. The shaper reference code generator, which depending on the phase relations between the indicated voltages, forms the coarse reference code L / i of the rotation angle of the selsyn rotor, varying with discreteness of 60 °, according to the following rule; The synphase nature of the output voltage of the selsyn and its supply voltage corresponds to "1, and antiphase -" On at the output of the corresponding driver. The code L from the output of the imager 4 directly records in the senior decades of the digital reading device 24.

Depending on the condition of the formers 5 ", one of the output tires of the decoder 6 appears a signal corresponding to a certain 60-degree sector of the angle of rotation 0; This signal establishes a potential potential at one of the inputs of a pair of elements AND 8 connected to the output circuits of the housing 7. The inputs of each of these comparators are connected to the corresponding output of rectifiers 3 so that, depending on the ratio of the rectified phase voltage of the synchine, from the outputs of the working (i.e., operating in the selected 60-degree sector) comparator 7, a signal appears that passes through the elements AND 8 and OR 10 to the switches 11, connecting one of the indicated voltages to the comparator y 12. The ratio of the stresses being compared (i.e. the state of the corresponding comparator 7) determines the sign of that half of the 60-degree sector in which the desired angle of rotation is in; this feature, which is an additional, fourth digit of the L / coarse code, is recorded in a certain decade of the digital reading device 24 s.

the output of the elements of OR 9, the connecting outputs of the elements of AND 8 (sign "O, corresponding to the first half of the selected 60-degree sector, or sign" 1, corresponding to the second half of the selected 60-degree sector).

The formation of the time interval ts ,, proportional to the angle of rotation in the rossin rotor, is as follows.

When the t / n supply voltage passes through zero from the negative region to the positive, the comparator 13 generates a start counting pulse that passes through the open valve 14 and sets the trigger 16 to a position where the pulses from the pulse generator 18 go through the open key element 17 the input of the counter 19. At the time corresponding to the equality of the compared voltage (one of the rectified phase voltages and the selsyn and its voltage f / n power) at the inputs of the comparator 12, the latter is triggered, and the pulse k Onts account with its output sets the trigger 16 to the original

condition; in this case, the key element 17 is closed, and the arrival of the counting pulses at the input of the counter 19 is stopped.

The contents of the counter at the point in time corresponding to the appearance of the pulse end

accounts, in proportion to the angle. Turn 6 of the rosin of the selsyn. Indeed, at the moment of equilibrium,

in - p or (7v, „sin E and sin aUD /, (2)

where Sv, n and i are the maximum value of the rectified phase voltage of the selsyn and the amplitude value of its supply voltage;

A / -time interval bounded by the pulses of the beginning and end of the account (). When fulfilling the condition, the following relation is valid.

(3)

W

If the pulse frequency of the generator 18 is equal to / g, then the value of the NZ code of the exact reference, which represents the angle of rotation 9 within the selected 60-degree sector, is

N, / in,

Where

1 - const.

Depending on the attribute determining the additional bit of the L) coarse reading code, the contents of the counter 19 are transferred to the digital reading device 24 through the code converter 20 to direct (via gates 21 and OR elements 23) or backward (via gates 22 and OR 23) code.

For example, in the first 60-11 healthy sector

the angle of rotation into the decoder b of the coarse-count code former 4 sets the resolving potential for one of the inputs of elements AND 8. If the angle of rotation is 0– | 60 ° in the first half of the sector, the condition and signal from the output of the working comparator 7 through the elements AND 8 and OR 10 sets the switches 11 to the position in which one of the inputs of the comparator-12 is connected to the direct phase voltage f / i of the selsyn (at the same time, this signal passes through the element OR 9 and the converter 20 which associated with individual output bits of the counter 19). If the rotation angle is in the second half of the sector under consideration, the condition is satisfied, the signal from the other output of the working comparator 7 passes through the elements AND 8 and OR 10 to the switches 11 and sets them to a position where to one of the inputs the comparator 12 is connected to the rectified phase voltage f / 3 of the selsyn (at the same time, this signal passes through the OR 9 and code converter 20, opening those valves that are connected to the zero outputs of the bits of the counter 19).

The operation of the converter is synchronized by the output signals of the control unit 15. The first signal (“Set. O”) sets the counter 19 to the initial state. The second signal. Prepares the valve. 14 for passing the start of the counting pulse from the output of the comparator 13 to the trigger input 16. The coarse count code generator is not directly connected to the control unit 15, therefore the coarse count code (including its additional bit) is continuously displayed in the digital delay device 24.

The proposed angular displacement transducer in the code differs from known devices in higher speed due to the introduction of new elements and the connections between them.

Claims (2)

1. Zverev, A.E. and others. Converters of angular displacements in a digital code. L., “E-nergy, 1974, p. 146. 2. Auth. St. USSR № 428427, -kl. G 08C 9/04, 18.09.72.