SU1737649A1 - Two-channel no-contact phase converter of angle - Google Patents

Abstract

Usage: in high-precision automatic control systems. Essence: a two-channel contactless phase angle converter contains three rotating transformers. The magnetic wires of the stators are placed in a common housing, the magnetic conductors of the rotors are mounted on a common shaft. Sine and cosine windings of stator 1, 2 and rotor 3, 4 are located on the stator and rotor of each rotating transformer. The number of pairs of poles of the windings is the same, and the rotor 3, 4 coil and cosine windings are connected in series to form two closed circuits. Depending on the embodiments of the converter, the inclusion of the windings of each of the transformers in these circuits is different. 4 spf files, 1 ill. 1 tab. fe vj cj vj o ± o

Description

The invention relates to a shaft rotation angle converter into an AC electrical signal parameter and can be used as a primary converter of a digital angle converter (CPU) designed for operation in high-precision automatic control systems.

A device is known which is characterized by a low temperature and temporal stability of the operation of a contactless phase angle converter.

The aim of the invention is to increase the temperature and time stability of the operation of a contactless phase angle transducer.

The goal is achieved by the fact that in a two-channel contactless phase angle transducer the number of pole pairs of the windings of rotary transformers is the same, and the rotor sine and cosine windings of all rotary transformers are connected in series to form two closed circuits. As a result of this switch-on, along with the measurement signal, the phase of which is proportional to the angle of rotation of the shaft, a second signal (reference) is formed, the phase of which is independent of the angle of rotation of the shaft and is equal to the own phase shift of the micro Romashins. The number of pole pairs of micromachines must be the same and equal to P, and the inclusion of the rotor windings of the measuring channel must be such that the output of the number of pole pairs is P - P 2P and at the output of the reference channel P - P 0.

The drawing shows a diagram of the proposed device.

The device contains stator sinus 1 and cosine 2 windings, rotor windings 3 and 4, similarly - sine and cosine, the first feeding phase shifter, the second measuring phase shifter, the third reference phase shifter, while the stators of all three micromachines are located in the common case, and the rotors are on a common shaft. The terminals of the windings are indicated as follows: C1 and C2 are the beginning and the end of the stator sinus winding. K1 and K2 - the beginning and end of the cosine of the stator; В1 and В2 - the beginning and the end of the rotor sinus winding; VZ and B4 - the beginning and end of the cosine winding of the rotor.

The sinus winding 3 of the rotor of the measuring phase shifter is connected in opposite direction, and the sinus winding 3 of the reference phase shifter is in accordance with the sine winding 3 of the supply phase shifter. The cosine rotor windings of all machines are connected in series and according to. The output signals of the measuring channel are removed from the stator windings 1 and 2 of the phase shifter, and the signals of the reference channel are taken from the stator windings 1 and 2 of the phase shifter.

As a result of the series connection of the rotor windings, the identity of the own phase shifts is high, since the magnetic fluxes of the measuring and reference micromachines are created by the same currents.

The expressions for the output signals of the measurement and reference signals are then written as follows:

y .. yo

z xzL.x + zU + zjJ1) v - Ü2 z (zLx + zg + z)

willJ H1 H V

v b1,,, -r,

v E2

zHzu + zU + z)

H N CHU

z c (zLx + z} 5 + zЈ)

where H is the mutual inductance of the stator and rotor windings of the windings;

a - the angle of rotation of the shaft;

Z is the winding resistance (index C refers to the stator windings, P to the rotor windings;

W - circular frequency (strokes denote W numbers: one stroke - feeding W: two bars - measuring BT. three bars - reference BT).

As can be seen from the expressions, the phase of the output signals of the reference channel does not depend on the angle of rotation of the shaft and is determined only by the individual phase shifts of the micromachines. The phase instability is compensated for in the secondary converter, an electronic unit, generating a digital angle code. The implementation of compensation can be conducted as well as analog form, using the signal of the reference channel in the feedback circuit, and in digital form, using the code of the reference channel as an amendment.

The table shows the possible connection of the windings of the rotors of the machine and the simplification of expression for the output voltages.

The phase instability of the phase shifter in the cascade connection is 0.2 electr / ° C. In the proposed dual channel, it is removed to 2, el. / ° C. When the number of pairs of poles is P 64, the magnitude of the reduced instability decreases from 11.25 / ° C doo, i.e. 94 times. In addition, the use of two channels reduces

Claims (5)

1. A two-channel non-contact phase angle transducer containing three rotating transformers, the stator magnetic conductors of which are placed in a common case, and the rotor magnetic conductors are located on a common shaft, while the stator and rotor of each rotating transformer have sinus and cosine windings, characterized in that , in order to increase accuracy by reducing temperature and temporal instability, the number of pole pairs of the windings of rotary transformers is the same, and the rotor sine and cosine The coil windings are connected in series, forming two closed circuits. 2. The angle transducer according to claim 1, stating that the first circuit is formed by connecting the sinus winding of the first with the oppositely connected sinus winding of the second and according to the included sinus winding of the third magnetic circuit, the second circuit is formed by consonant switching on the cosine windings of three magnets - nitrovodov, 0 five 0 five 0 3. The angle transducer according to claim 1, wherein the first circuit is formed by connecting the sinus winding of the first according to the sinus winding of the second and opposite to the sinus winding of the third magnetic conduits, the second circuit is formed by the cosine winding of the first with counter-included cosine the second and counter-included cosine winding of the third magnetic circuit. 4. The angle transducer according to claim 1, wherein the first circuit is formed by connecting the first sine winding with the second cosine winding of the second and opposite cosine of the third magnetic core, the second circuit is formed by connecting the first cosine winding of the first sinus windings second and third magnetic circuits. 5. Converter pop. 1, that is, with the fact that the first circuit is formed by connecting the sinus winding of the first one with counter-included cosine windings of the second and third magnetic cores, the second circuit is formed by connecting the cosine winding of the first with oppositely included sinus windings of the second and third magnetic cores . Note. A plus sign in front of a winding number means a consonant minus - counter inclusion.