SU567163A1 - Phase system for angle-to-code conversion - Google Patents

Description

one

The proposed phase rotation angle-to-code conversion system is intended for use in control systems with digital computers, in particular for transmitting, measuring, and coding angles of rotation of an Object shaft.

The known phase system converts the angle of rotation into a code containing a multi-pole rotation angle sensor, a single-phase phase shifter using a sine-cosine rotary transformer, the output phase windings of which are equipped with a single phase-shifting / C-circuit, phase discriminator, amplifier, motor, and a multi-angle angle-code converter 1 .

However, due to the high sensitivity of such a system to the instability of the frequency of operating signals of a multi-pole rotation angle sensor, as well as to a change in the parameters of the phase shifting circuit of the phase shifter against time or ambient temperature, the accuracy of converting the angle to code decreases.

Of the known systems, the closest to the technical essence of the invention is a system comprising a multi-pole rotation angle sensor, the output of which is connected to the first input of the phase discriminator via a compensating phase shifter and through serially connected sinus-sinus-rotating rotary transformer and the first phase-shifting bridge circuit to the second input of the phase discriminator, the output of which is connected kinematically through an amplifier and an executive motor with an angle-code converter shaft and a sine-to-shaft shaft asynum rotary transformer, the second output connected to the second phase-shifting bridge circuit

2

In the known system, when the output impedances of the sine-cosine rotary transformer and the power source are unstable due to a change in ambient temperature, an error occurs in converting the angle of rotation of the shaft into a code. This error consists of a variable component, depending on the angle of rotation, and a constant component of the error, which does not depend on the angle of rotation.

The purpose of the invention is to increase the static accuracy of the system converting the angle of rotation into a code when the output impedances of the sine-cosine transformer and its power source are unstable, as well as providing the possibility of entering angular corrections.

This is achieved by the fact that the system has first and second compensating RC circuits connected in parallel with the corresponding phase-shifting bridge circuits, the compensating phase shifter being made using a sinus-sinus-rotating rotary transformer.

The drawing shows a phase system for converting a rotation angle into a code.

The phase rotation system converts the code into a multipolar rotation angle sensor 1, the output of which is connected to the first input of phase discriminator 3 through a compensating phase shifter 2 and through series-connected sinus-sinus-rotating rotary transformer 4 and the first phase-shifting bridge circuit 5 to the second input of phase discriminator 3. Output discriminator through the amplifier 6 is connected to the actuator 7, connected kinematically with the shaft of the converter 8 angle-code (reading device) and va scrap sine-cosine rotary transformer 4, the second output of which is connected with the second phase-shifting bridge circuit 9. First 10 and second And compensating / C-depy are connected in parallel, respectively, with phase-shifting bridge circuits 5 and 9. Sine-cosine rotating transformer 4, phase-shifting The flashing bridge contours 5 and 9 form a device called a phase shifter. The compensating phase shifter 2 contains a sine-cosine rotating transformer 12, the first 13 and; the second 14 phase-shifting bridge circuits, the first 15 and the second 16 compensating C-circuits.

The system works as follows.

When the input shaft of the multi-pole angle sensor 1 is rotated by an angle p, the phase of the control output voltage of the sensor Uy is shifted relative to the phase of the reference voltage i / o by an angle cf pp, where p is the number of pairs of poles of the angle angle sensor. In this case, at the output of the phase discriminator 3 and the amplifier 6, a voltage is generated; moreover, the AV mismatch (AU) is not. Under the action of this voltage, the motor 7 spins the rotor of the sine-cosine rotary transformer 4, and with it the shaft of the semi-variable transducer 8 angle-code angle. From the output of the angle-code converter, a numerical equivalent (code) proportional to the value, i.e., the angle of rotation of the object shaft, will be written off. When the ambient temperature changes, instability of the output resistances of the sine-cosine rotary transformer and the resistance of the power supply source occurs, which can cause a conversion error. When choosing the parameters of compensating C-chains 10 and 11, equal to

  ,

with gz ci

the complex input resistance of phase-matching bridge coitures 5 and 9 is aligned. This provides the condition for accurate operation of the phase shifter 17, as a result of which: there is no variable in the system depending on the angle of rotation that makes up the error. Simultaneously with a change in the ambient temperature, the phase shift of the output voltage f / y of the phase shifter 17, which does not depend on the angle of rotation, appears. This may cause a zero position offset of the system (constant component

errors). Included in the reference channel of the system is a compensating phase shifter 2, which contains a sine-cosine rotating rotary transformer 12, phase-shifting bridge circuits 13 and 14, compensating

C-circuits 15 and 16 are made identical to the phase shifter 17 installed in the control channel. Therefore, a similar phase shift occurs at the output voltage of the compensating phase shifter 2. Due to

With this, the output of the phase discriminator does not form a misalignment voltage capable of causing a shift in the zero position of the system. Incorporating a compensating phase shifter containing a sine-cosine rotating transformer into the reference channel also allows, if necessary, introducing angular corrections or adjusting the system's dead position by rotating the rotor of the sine-cosine rotating transformer 12 by the angle Y. This phase system works this out the correction value and an additional angle corresponding to the angle correction is added to the measured angle (code).

The use of this system under conditions characterized by a wide range of ambient temperature variations distinguishes it favorably from the known phase systems for converting the angle of rotation into a code, since it does not contain any component error caused by the instability of the output resistance of the blue-cosine rotary transformer and resistance power source. This makes it possible to reduce the stability requirements of the output resistance of a sine-cosine rotary transformer and the resistance of a power source, using serial sinus-cosine rotary transformers and simpler power sources. In addition, the presence in the system of the possibility of introducing angular corrections provides an extension of the field of application of the phase system of the angle of rotation e code (for example, it is possible to sum and subtract two angular values with their conversion B code). Tests of the proposed system showed its high environmental performance.

Claims (2)

1. Phase system for converting / turning to a code containing a multi-pole rotation angle sensor, the output of which is connected to the first input of the phase discriminator via a compensating phase shifter and through series-connected sine-cosine rotating transformer and the first phase-shifting bridge circuit with the second input of the phase discriminator, output which, through an amplifier, is connected to an executive motor connected kinematically to an angle-code converter shaft and a sine-cosine rotary shaft State of the transformer, the second output of which is connected to a second phase shifter bridge circuit, characterized in that, with a view to the Enhance static accuracy installed therein first and second P-compensating circuit connected in parallel with the respective bridge circuits. 2. The system of claim 1, wherein the compensating phase shifter is implemented using a sine-cosine rotary transformer. Sources of information taken into account in the examination 1. Elements of digital control systems. Ed. V. A. M snikova, L., Science, 1971, p. 234. 2. USSR author's certificate No. 252441, cl. G 05B 11/12, 1969. R 71 Ir :: i