SU1713037A1 - Dual-channel resolver - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve the accuracy by reducing the influence of a coarse channel on an accurate one. A two-channel rotating transformer consists of a rotor and a stator, in the slots of one of which are located the annular excitation winding of the coarse channel and the excitation winding of the exact Channel, and in the slots of the other - sinusoidally distributed output windings of the coarse and precise channels. The annular coil of excitation of the coarse channel has a distribution of conductors in the grooves of the magnetic circuit, satisfying the relation given in the description. 3 ill., 2 tabl.9 ^

Description

The invention relates to electrical engineering and can be used to create highly accurate information electric machines.

A two-digit rotating transformer is known, comprising a magnetic core with excitation windings of accurate and coarse channels and a magnetic core with output windings, into the excitation circuit of one of the channels of which a phase-shifting device is inserted.

A disadvantage of this device is the low accuracy in the angle-code conversion mode.

A two-digit rotating transformer, made in the form of two electric machines, each of which contains stator and rotor magnetic conductors, is known on two single; 1-dimensional magnetic conductors of both electric machines, two mutually perpendicular sinus and cosine windings with different numbers of pole pairs are installed. The interconnection of the windings of the two electric machines for collaboration is such that, in the output windings of the exact reading of the device, the signals induced by the coils of excitation of the coarse reading of the first and second electric machines are subtracted as a whole. This achieves increased accuracy.

The disadvantage of the device is /; the falsity of the design and the doubled axial dimension.

The closest to the proposed technical essence and functional use is a two-channel rotating transformer (DVO. Adopted as a prototype. Containing exact (multi-pole) and (two-pole) channels on the same magnetic core, in which | azdpolar windings are of different types A disadvantage of the prior art device is the lack of accuracy due to the guidance of additional signals at the output of the exact channel from the coarse channel excitation circuit. The aim of the invention is, Improving DVT accuracy by reducing the influence of the coarse channel's winding on the output channels of an accurate channel. This goal is achieved by the fact that a two-channel rotating transformer containing a stator and a rotor, in the slots of one of which a distributed ring-shaped winding of the channel and the excitation winding of the exact channel, and in the grooves of the other - sinusoidalin) distributed windings and precise channels, the circular winding of the excited channel 14 is made with the distribution of the wire NIKOV along the magnetic core slots b making the ratio T (j; N.eo, (s, I, 1A ship d. where d., ± 1M ± 1; 1, p, teZJ are the nasfOB numbers of the magnetic core carrying the winding of the air) tkddeni; , Z1, Z2 - the number of holes of the magnetic cores, carrying respectively windings of bobbins; HI is the number of conductors of the channel winding rpiii o in the 4th slot of the magnetic circuit; p is the number of pole pairs of windings of the exact channel; .-; ;, .-,. ; , / W ffit max is the number of turns covering the prong of the magnetic winding of the winding excitation of the exact channel ;. a is the ratio of the magnitude of the excitation currents to the exact channels; $ 41 is the permissible angular error introduced by the influence of the harmonics of the rough channel's excitation circuit. On "fmr. The construction principle of npejDinaraeMoro TWT is shown; MA of Fig. 2 is a basic TFT electrical circuit; Fig. 3 is an example of a winding scheme in OzbuhadenI coarse channel | p1. The twin rotary transformer SD8T), as well as the prototype, consists of a coaxially arranged stationary stator housing 1 (Fig. 1) carrying the magnetic core 2 and a rotary housing of the rotor 3. carrying the magnetic core 4. On the magnetic conductors 2 and 4 of the stator and rotor are placed windings 5. Fundamentally, the field windings can be placed both on the rotor and on the stator. In the exemplary embodiment described here, the field windings are placed on the rotor, and the output windings on the stator. Two excitation windings are placed on the rotor (Fig. 2): the excitation winding of the coarse channel 6 is of the bipolar ring type; The excitation winding of the exact channel 7 is made with the number of pairs of poles p and can be either sinusoidally distributed or concentrated, such as a prong-pole. In the example under consideration, the excitation channel winding is made of a sinusoidally divided drum type. On the magnetic core 2 of the stator 1 there are two pairs of sinusoidally distributed output windings: Coarse channel sine 8 and cosine 9 and exact channel-sine 10 and cosine 11. Output coils of coarse KaHaiia have one pair of poles and are usually ring-shaped, although in principle they can be 1 ; s and drum. The output windings of the exact channel have the number of pairs of poles p And are drum type. With a sinusoidal distribution of the output windings of the exact channel in the distribution of their magnetizing forces (NS) the strongest distorting the accuracy of the ow harmonics. They have the order of yy ± p, where Z2 is the number of teeth of a Magnetic Drive carrying the output windings. Therefore, to ensure high accuracy of these harmonics, there should be no distribution in the NA of the coil channel's excitation circuit. However, when calculating the sinusoidal distribution of the coarse channel excitation winding and rounding the values of the numbers of conductors in the grooves of the magnetic core (in the ring sections) to integer values, an additional spectrum of harmonics is obtained, which usually contains Z2 ± p harmonics. To eliminate harmonics, in contrast to the prototype in the proposed DVT, the number of conductors in the grooves of the magnetic circuit (Nf) of the excitation winding and the poor channel must satisfy the ratio 1H |,), |, n .. and () SAtMtpA. (1) (a ± p) wn..in. I are the numbers of the slots of the magnetic circuit carrying the field windings; Z1, Z2; the number of grooves of the magnetic cores carrying, respectively, the excitation winding and the output; N {is the number of conductors of the coil channel excitation winding in the j-M slot of the magnetic circuit; p is the number of pole pairs of the exact channel; vvmp-Maximum number of turns covering the magnetic circuit prong of the excitation winding of the exact channel; a is the ratio of the magnitudes of the currents of excitement of coarse and exact channels; d - the permissible angle noipeuiHOCTb, introduced by the influence of the harmonics of the chain of excitation to the day of the coarse channel. The fulfillment of relation (1) for each harmonic (z2 - p) and (zz + p) is achieved by correcting (re-rounding) the calculated values of Ni. In principle, the left side of relation (1) should be almost zero. According to the example of the implementation of the proposed dual channel BT. Let it be given: the number of slots of the magnetic circuit of the rotor carrying the excitation windings, Z1 21, the number of teeth of the magnetic circuit of the stator. carrier output windings, Z2 23; The number of pole pairs of windings of the exact channel is p 8; the maximum number of turns of the excitation winding of the exact channel Wmp 100 and the maximum number of conductors in the slot of the magnetic circuit of the annular winding 1CH01 of the coarse channel Nm 10. The excitation windings of the coarse and exact channels are connected in series, i.e. coefficient 1. It is specified that an error is permissible due to the influence of the harmonics Z2 - р and gyy + p no more than 2 seconds. . The numbers of conductors of the coil excitation winding in the grooves of the magnetic circuit are calculated, by the expression, nSln | |. (2) The calculation of the conductors in the grooves of the magnetic circuit by the expression (2) is summarized in Table 1 (columns 1-5). Given the right parameters, the part of the inequality (1)) l, WmpSi «|, Sm | f tlu« ... ir Vsin-ib-EL LPL harmonics Z2 - p will be equal to 1S -2t-1006mj SOS 0.05f «FOR harmonics. Z2 + P 31 -2i-WO 77 sins 0 ,, lThese numbers are valid values, the left parts of inequality (1) must be smaller than for harmonics 15 and 31. Calculate for the calculated distribution of the numbers of excitation winding conductors (Table 1, column 5) the values of the left-hand sides of inequality (1). For the harmonic Z2 - p 15, the left part of inequality (1) will be, f isWef; t, c ", ifi 1,563662. 31 left part For the harmonic Z2 + p, inequalities (1) will be rJJ2Ti -, 2 .atavr .-. Г Ojsinaf - Njcos3t jj JЫ, 5ош As these significantly exceed the permissible ones (0.0511 for 15th and 0.1711 for 31- harmonics), then the required accuracy is not ensured. It is necessary to correct (re-round) Ni values. This problem is solved, for example, by changing the numbers of conductors in the slots (see Table 2). The corrected law of distribution of conductors in the grooves of the magnetic field of the excitation winding is given in column b of table 1. These changes ensure the fulfillment of inequality (1) for both harmonics (15 and 31). Moreover, the law of the left part of inequality (1) will be jt, |, W, cos, s | f.,. ,, n15 | f, V | -0. {lf | lj: CO 3l | f. +, srn3t | fl I 0.02437. The circuit for performing the coarse channel annular excitation winding is shown in FIG. In the diagram, at the frontal parts of the annular sections of each, the values of the numbers of conductors in the groove (or turns of the annular section with a winding sign) are written. In the drawing, the numbers of the slots from the first to the 21st are indicated by the slots 12 through 32.

The proposed device works as follows.

When applying the excitation voltage to the sequential switching on of the winding 6 and 7, depending on the angular position of the rotor, the output windings of the coarse channels 8 and 9 are voltage, respectively proportional to sin and cos, and the output windings of the exact channels 10 and 11 stress, respectively, proportional to sinp ai cosp se.

Unlike the prototype, the proposed DVT has increased accuracy due to a significant reduction in the effect of the excitation winding of the coarse channel on the output windings of the TO4Hj3ro channel.

This affect is obtained by fulfilling relation (1) in the calculation of the excitation winding, since in this case the excitation windings suppress the two strongest harmonics in the NS, which are present in the NS output windings of the exact channel.

Claims (1)

Formula of inventions A two-channel rotating transformer containing a stator and a rotor, in the slots of one of which a sinusoidally distributed annular coil of the coarse channel excitation winding and excitation winding of the exact channel are laid, and in the grooves of the other coarse distributed and sinusoidal distributed winding of the exact channel, and the exact channel coil is drummed In order to increase accuracy by reducing the influence of the coarse channel on the exact one, the coil excitation ring coil is made and with the distribution of conductors in the grooves of the magnetic circuit. satisfying ratio And {, 1, «« (f -, |, «() 1г 1 SAilnpd. where is d .. w I are the numbers of the slots of the magnetic circuit carrying the field winding; Z1, Z2 is the number of grooves of the magnetic cores carrying, respectively, the excitation winding and the output; Ni is the number of conductors of the excitation winding of a coarse channel in the 1st slot of the magnetic circuit; p is the number of pole pairs of the exact channel; wmp is the maximum number of turns covering the magnetic circuit of the excitation winding of the exact channel; a is the ratio of the magnitudes of the excitation currents of the coarse and exact channels; e is the permissible angular error introduced by the influence of the harmonic Z2 ± p of the excitation circuit of the coarse channel. Table 1 table 2