SU1580493A1 - Multiple-pole rotating transformer - Google Patents

Abstract

The invention relates to electrical engineering and can be used to create high-precision electrical information machines. The purpose of the invention is to improve the accuracy of multi-pole rotating transformers (BT). VT contains one of the magnetic cores, for example, a rotor, with a number of teeth, a multiple of the number of pole pairs, having grooves, the bevel and the width of which are equal to 2/3 and 1/5 of the dental division, respectively, and carries a tooth-pole winding, and another a magnetic conductor, for example a stator, with a number of teeth multiples of 77, bears on itself two sinusoidally distributed windings. The numbers of turns of sinusoidally distributed windings W J, spanning the teeth of the magnetic conductor (where J is the number of teeth), satisfy the Z / 7 ratios @ and Z / 11 ratios @, where I is variable summation

Z - the number of teeth of the magnetic circuit carrying sinusoidal windings

I 1 - numbers accepting in each equality one value from the row 1,2 ..., Z / 7

I 2 - numbers that take in each equality one value from the rows 1,2 ..., Z / 11. 2 or 3 table.

Description

owls having grooves, bevel and width of which are numbers that take in each equal-

ryh are equal to 2/3 and 1/5 dentate division, respectively, and bears

by one value from the row 1,2 ..., t Z / 11. 2 Il. 3 tab.,

The invention relates to electrical engineering and can be used to create high-precision electrical information machines.

The aim of the invention is to improve the accuracy of the conversion.

FIG. 1 shows a diagram of a rotating transformer (VT); 2 is a circuit diagram of a BT.

Multi-pole VT consists of coaxially arranged stationary stator housing 1 (Fig. 1) carrying the magnetic core 2, and a rotary housing 3 of the rotor carrying the magnetic conductor 4. On

windings 2 and 4 of the stator and the rotor are placed windings 5o

One of the magnetic cores, for example, a rotor, has a number of teeth, a multiple of the number of pole pairs (p) of a multi-pole VT and carries one excitation winding 6 (Fig. 2), made of a pole-type tooth. Accept, and the number of teeth of the rotor magnetic circuit is 64.

The rotor magnetic circuit in order to suppress, in the form of magnetizing force (N.So), the field windings of the lower (Zp and 5p) and multiple harmonics made by it

SP

00

about

4i

with

00

with a bevel of grooves on - tooth division

and the size of the spitz (groove) on the surface of the rotor, forming a gap between roto1

rum and stator equal to tooth division.

The second magnetic circuit 4 (of the stator) is made with a number of teeth multiples of 77. And the two magnetic cores of the stator accommodate two sinusoidally distributed out- ward quadrature (sinus and cosine) windings 7 and 8.

The numbers of turns of sinusoidally distributed windings 7 and 8 W:, covering the teeth of the magnetic conductor (j is the number 1 of the teeth) must satisfy the relation Z

five

cheni m

(ABOUT

and

about

de g - Z 1,

U it

w

g is variable summation;

- (i-1).

(2)

1, + y (i-1)

the number of teeth of the magnetic circuit carrying sinusoidally distributed windings; the numbers that take on each equality by one value,

2 from p yes 1,2, ..., j;

numbers taking in each equality one value,

2 from p yes 1,2,.,., -Jj;

1 „+ -Ig U - 1) and

tt

numerical values of numbers

teeth j.

For example, p 32, the number of teeth of the stator carrying the output windings is 77, the number of teeth of the rotor is 64 45

It is assumed that the maximum number of turns covering the stator magnetic circuit wave, W 100. According to the theory of calculation of sinusoidally distributed windings, the number of turns covering the 50 teeth of the magnetic core is determined in accordance with the expression

j

W cospoti,

P j

(3)

where W, is the maximum number of turns,

covering one prong; . W is the number of turns covering 1 j-th tooth;

four

j is the tooth number;

the angular location of the axis of the j-ro prong on the bore of the magnetic core.

To obtain equality of the parameters of the sine and cosine windings and the same law of their winding, the value

is defined by the expression

i «H 4

1G + (3 - O, (4)

where Z is the number of teeth of the magnetic circuit carrying this winding (for the specified case of the stator magnetic circuit).

In known multipolar VTs, the calculated values of U: are rounded to whole numbers and the windings are compiled from the data obtained. When rounding the calculated values of W to integers, the sinusoidal distribution of the numbers of turns of the windings is disturbed, And an additional spectrum of harmonics appears in the decomposition of the NS form, which should not be with an ideal sinusoidal distribution.

Since the rotor windings are made of a tooth-pole type, then in N.S. Of this winding, the strongest harmonics are the harmonics Sp, 5p, 7p, 11p. In addition, the harmonics Zr and 5p and their multiples are suppressed by the execution of certain bevel and magnitudes of the grooves of this magnetic circuit. Therefore, after rounding the calculated values of the number of turns of the output sinusoidally distributed windings, the additional harmonics spectrum should be equal to zero amplitude of the harmonics of about 7p and 11p, which is achieved by choosing the number of stator teeth multiples of 77 and performing equalities (1) and (2),

The calculation of the number of turns covering the teeth of the magnetic circuit, one of the stator windings using the expressions (.3) and (4) is presented in Table 1.

The calculated law (board 1) is checked for compliance with expressions (2) and (1).

For expressions (1) the value of the left parts of the equality

iw. + - (i-n zw -nui-D

, -. h h and

55

at different values of table. 2

1 are given in

For expressions (2), the values of the left parts of equalities

And, +

77

s

TT (i-D ЈW + 7 (i- 1) 1 r "

one,

at different values of table „3.

. j are given in

With rounded calculated values of the number of turns to the nearest integer numbers, relations (1) and (2) are not fully met. Therefore, it is necessary to introduce a correction (re-rounding) of the N values. The corrected values of the numbers of turns, ensuring the fulfillment of relations (1) and (2), are given in Table. Instead of W-, -73 -19 94

one;

wtiW, f Ww-41} p -100 W40 -50

Installed -74 -20 93 -40 -99

t u ","

W.5 W «Y41

51

wl w -49

W

W -100

-61

4G

52

Wee -99

ws "H" 78

 SO

W (0

W

t3:

-62 77

After this correction, equalities (1) and (2) are completed, the device has no interaction between the primary and secondary windings and the 7p and 11p harmonics due to their complete suppression at the output windings

The implementation of equalities (1) and (2) and the number of teeth of the magnetic circuit 77 (7 and 11), ensures the suppression of N.S. harmonics winding on the order of 7 and and they are multiple, i.e. and harmonics 7p and 11p.

The distribution curve of N.S. along the air gap for sinusoidal distributed windings can be represented as

F ") 4f + 5 (a.coskot + b.sinkV

where a &

ABOUT

au fw) cosko del, rj

H f F (o /) sinko / suppression in N.S. harmonics k should be equal to zero a and bj., which is achieved by

eleven

S F (eOcosWdrf O; o

No. | ) sinkcx; de 0.

(five)

Since the turns of each winding are connected in series and the same current I flows through them, the distribution of N.S. proportional to the distribution of turns on the teeth of the magnetic circuit.

The function F (o () can be represented as a step-like curve. The values of this function against the j-wave j of the magnetic conductor are equal

FjCcO IW;

(6)

15

Substituting (6) into the left-hand sides of (5) and performing some transformations.

21G

get

2 ° 0

j) cosko / d izj w. coswdof

 ff 2 V2 -Isinkf W Coskof.-;

1 Z J J 2 "0 jF (cOsinkc do / IjM W sinkc / drf

° r 2 5 Isink f W sinko / .. J JM J J

Then, to suppress the harmonic k, instead of the expression (5),

2 W coskrf, 0; Ј J J

ZW.sinW 0.

j i j j

35

Or when accounting

2

jj 0, (7)

40

If between Z and k there is a common factor a, then as j varies from 1 to Z,

45

cos

and

repeats a

every other time is

j, i numerical repetitions of these functions will be at values

55

Therefore, it is possible to write expressions (7) in the form

Thus, to suppress any decomposition of N.S. the harmonic winding k, the number of which has a common factor with the number of teeth of the magnetic circuit, it suffices to zero the sums in square brackets of expressions (8), which is written by expressions (1) and (2) respectively for values that are common multipliers between Z 77nk 7p and Zo 77 and k 11p.

The transformer works as follows.

When voltage is applied to the winding 6, the excitation windings 7 and 8, depending on the angular position of the rotor, are induced by the voltage, proportional to sirip o (

And cos i /.

Due to the implementation of one magnetic circuit with a number of teeth multiples of 77, and a sinusoidal distribution of windings with satisfaction to equalities (1) and (2), all harmonics multiples of 7 and 11 are completely suppressed, including harmonics 7p and 11p, which gives the essentials, j

five

0

Increase in accuracy of multipole BT operation.

Claims (2)

Invention Formula A multipolar rotary transformer containing a stator and a rotor, one of which is made with a number of teeth, a multiple of the number of pairs of poles p, with a slope angle of 120 / p slots and a width of 36 / 6p, and the second has two sinusoidally distributed windings, about The fact that, in order to increase the accuracy of the conversion, the magnetic core carrying sinusoidally distributed windings is made with a number of teeth of a multiple of 77, and the number of turns of sections of sinusoidally distributed windings W spanning the teeth of the magnetic circuit, where j is the number of the tooth, satisfies relations five 0 Where iw if Zw Uf i It 1, ; J 7 Z 11 (i-O 05 (i-D 0, - variable summation; -12 Z, .Ј ,. ..,, -1 2 2 1,2,, .., - j Z is the number of teeth of the magnetic circuit, carrying sinusoidally ras, distributed windings; Z Z j 1 + T (i-1) 2. + -yy () - number Jnomer values of the tooth Table 71 -97 96 -69 23 29 -74 93 -95 1580493 Continued table. one Continued table. one table 2 T a b h and c a 3 1 SinpoC