SU875417A1 - Potentiometric shaft angular position-to-code converter - Google Patents

Description

 . . The invention relates to Instrument Engineering, in particular to automation and analog computing. Potentiometric sensors of type PC with unlimited 1M range of rotation angle oi are known, made on double-lever potentiometers with ring resistive elements and three taps, the potentiometers being installed on different shafts, the supply voltage is connected to the first and second potentiometers, respectively, and the tapes of resistive potentiometers, respectively connected by a three-wire line 1.

A known converter of angle oL of shaft rotation to voltage U (oi), made on the basis of an annular linear potentiometer with unlimited circular rotation of the slider, for example, precision potentiometers PL-1, W1-2 2.

 However, despite the possibility of an unlimited circular rotation of the engine, the operating range of the angle ci p of such converters is essentially less than a full revolution, i.e. oip 360 (for the above mentioned types of potentiometers of p 330 °), due to the need to create a gap between, the resistance of their resistive elements to which the supply voltage is connected by means of taps.

The purpose of the invention is to expand the working range of the potentiometric converter to almost full shaft rotation, i.e. before

15 .

The goal is achieved by the fact that in a potentiometric transducer of the angle of rotation of the shaft into a voltage containing a linear ring

Claims (2)

20 a potentiometer with an infinitely rotated slider and a semi-ring resistive element, a resistor, an adder and a second circular linear potentiometer with an unlimited rotating slider and a circular resistive element are inserted, the resistive elements of the circular linear potentiometers are connected in parallel with each other, and the leads of the sliders mounted on the common input shaft are connected with the inputs of the adder, in addition, the conclusions of the resistive elements are made in the diametrically-full-wave points, as well as the fact that the adder is Flax with the possibility of adjustment of the transmission coefficient for each input. FIG. Figure 1 shows a diagram of a potentiometric converter of the angle of rotation of the shaft to the voltage in Fig. 2 of the voltage graph on the converter elements as a function of the angle 0 of rotation of the shaft. The converter contains resistive elements and 2, sliders 3 and 4 ring linear potentiometers, shaft 5, on which are installed the sliders of ring linear potentiometers, adder 6 and voltage divider 7, which is used as a resistor, and in water resistive elements 1 and 2 rings Linear potentiometers for connecting the supply voltage Up are made in diametrically opposite points corresponding to the SG and G80 readings of the BanaoL angle of rotation, the drives of the sliders 3 and 4 are connected to the first and second inputs respectively and 6, the output of which is the output of the converter. The converter works as follows. When the shaft 5 is rotated, for example, from the initial zero position in the direction of increasing the angle o, the engine Ug, proportional to the angle C, is removed from the slider 4, which at o / 180 reaches a maximum value of 11 (o (Jo / 2 since the resistance The divider 7 is chosen equal to the resistance of the resistive element 2 at its outlets. With a further increase in the angle of rotation of the shaft shaft 5, the voltage u2 (e6) decreases proportionally and reaches zero value at ° C 360, however, from the slide 3 with increasing ° C in the range from 180 and 360 ° shot proportionally increasing from zero to U voltage C. (pi). As a result of the addition of these voltages, a total prop 74 is generated at the output of adder 6 ° углу in the range of O-3bO increasing voltage and K). {o "- ) (} (cL} With further rotation of the shaft 5, the cycle repeats and the voltage U (ei) becomes periodic with a period of 360. When the shaft 5 rotates in the opposite direction (reverse mode), the voltage and (-ci) becomes periodic (with by the same period of 360 °) decreasing from its maximum value to zero. The presence of a divider 7 in the device is not necessary. However, when it is removed, it is necessary to change one of the transmission coefficients of the voltages C (oi) and i2C: 3 () by adder 6, i.e. either double for UL (fi) or double for (it (d.} The ambiguity of the voltage U (о () at oL 0 or multiples of 360) also implies the presence of some non-working zone between the maximum (near and 360). and minimum (close to o) values, but in principle this zone can be arbitrarily small, since any reduction is not associated, for example, with the danger of a short circuit between the ends of the resistive element under the maximum potential difference / (iglf that has place in known K {linear linear potentials In case of increased accuracy requirements for reproducing the dependence U (o6), the potentiometers of this converter can be equipped with any known correction devices (error compensation mechanisms.) The formula of the invention, I. Potentiometric converter of the angle of rotation of the shaft into a voltage containing a ring linear potentiometer with an unlimited rotational engine and a semi-ring resistive element, characterized in that, in order to extend the working range of the angle, He entered a voltage divider, an adder, and a second circular linear potentiometer with an unlimited rotation engine and a ring resistive element, the resistive elements of the circular linear potentiometers being connected in parallel 5 to each other, and the outputs of the sliders mounted on the common input shaft are connected with the inputs of the adder. 2. The transducer according to claim I, which is distinguished by the fact that, pulling out the resistive elements is fulfilled in diametrically opposite points. 3, the Converter according to claim I, which is characterized by the fact that the adder is completed with the possibility of tuning the transmission coefficient for each input. Sources of information taken into account during the examination 1.Agaykin D.N., Kostina Y.K., Kuznetsova N.N. Sensors of control and regulation. M., Mechanical Engineering, 1965, p. 27-28. 2.Agaykin D.N., Kostina E.N., Kuznetsova N.N. Sensors of control and regulation, M., Mashinostroenie, 1965, p. 26-27 (prototype).