SU1577019A1 - Device for obtaining m-phase current of stable frequency - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve manufacturability. The device contains two rigidly coupled generators, the phase excitation windings of which are connected to a low-power source of stable frequency voltage, and the main windings are divided into groups according to the number of phases of the load, connected in series with each other and through the semiconductor switches connected to the load. To improve the manufacturability of the device, the core windings of both machines are proposed to be made symmetrical with M .N phase (N ≠ I .M, where I = 1,2, ...), the ends of the phases of the first generator with the numbers K 1 = 1+ (N-1) M + (M-1) .N + J .M .N to connect to the beginning of the phases of the second generator with the numbers K 2 = 1+ (N-1) .M- (M-1) .N + J .M .N where M = 1,2,3, ..., M is the sequence number of the phase group, N = 1,2,3, ..., N is the sequence number of the phase in the group, J = -1 for K 1 (K 2 ) μ .NJ = 1 for K 1 (K 2) ≤0 and J = 0 for the remaining values of K 1 (K 2) for any M ≠ 2 and N 2. 1 il.

Description

The invention relates to electrical engineering, in particular to alternating current generators, and can be used in a national economy where it is necessary to provide consumers with a current of stable frequency at a variable rotation frequency of autonomous generators, in particular, in aircraft, ship and wind installations.

The aim of the invention is to improve manufacturability.

The drawing shows a device for obtaining a g-phase current of stable frequency, it contains two rigidly coupled m-phase-phase generators 1 and 2, whose excitation windings in the diagram

are represented by three-phase parallel-connected windings with a counter order of phase alternation connected to a low-power source 3 of a given frequency, and the main windings through switches 4-6 are connected with the load 7. Phase windings of Korean generators in the number of Hgp are connected in m groups, each of which is a p-phase symmetric system, with the ends of each group connected to a switch of a given load phase.

The phases of the core of the first generator with the numbers (N-1) ra + (M-1) "n + I,. N p are connected to the beginning immediately of the second generator with the numbers + (N-1) ra- (M-1) n + I .. ra-n, where, 2,3, ... m is the sequence number of the phase group, Ne1, d, 3, ..., n is the sequence number of the phase in the group, with), etc., with K . (K2) 0 and for the remaining values of KjXK) for any,. Switches 4-6 consist of two p-phase controlled rectifying circuits connected in parallel and opposite to each other. A device for obtaining a stable frequency m-phase current operates as follows.

In generator 1, the circular magnetic flux created by the excitation winding rotates in accordance with the direction of rotation of the inductor and an emf with frequency f t is induced in the core winding

f + f. where f. Ј; - - rotation frequency

W, f 6 is the excitation frequency.

In the generator, a 2-stream flow, created by the excitation winding, is directed in the direction opposite to the inverse-4 inductor. In the case of Vorg-7 washing, an emf with a frequency of f-fa-f8 is induced. When the crust coils of generators 1 and 2 are connected in series, the emf is summed up and at the output, an emf with carrier frequency f, 5 (f 1 + f 2) frequency modulated, 5 (f, -fg)

fb

Voltage phase windings in the generator 1 are equal

U ,, Um sinCuio + Ug) t;

u "sUTnsinC (w0 + we)

U U sinCtuV) t-2fy;

Uk Um sin (w0 + wa) t-dC-Dt J,

2f

where u., phase shift angle

 m.n

adjacent phases, K - phase sequence number. The voltage of the phase windings of generator 2 can be represented in a similar form. The total voltage in series connection of the phase K 1 of the generator 1 and the phase K 2 of the generator 2 will be equal to

UCtbU sinCCWj + CUj) t- (Kr1) yt

+ Um sin tCuy-u t-CK -l). t 2U№sin u ,, t-) coa tWfrt.

 Kjl $ t v J.

When choosing the value of n for a given number of phases of the load m, it is necessary to observe the condition of symmetry kaK pin-phase

Q

five

0

 5 9

five

windings of the core and of each of the p-phase windings.

Based on these conditions, it is possible to obtain general patterns for determining the sequence number of the phases of generators 1 and 2 included in each group. For generator 1, the sequence numbers of the phase windings are chosen according to the law

K., 1+ (N-1) PE + (M-1), n + I-m-p.

The sequence numbers of the phase windings of the generator 2, included in series with the windings of the generator 1, are selected by law

K I + CN-Om-CM-O n + I.m.n, where, 2, ..., m is the sequence number

phase group;

N 1,2, ..., p is the order number of phases 1 in the p-phase group.

 at K1 (K) tn, at Kf (K2); 0, for the remaining values of K (2) for any,

The component 1tpv in terms of K, and Kg is necessary to obtain numbers that are positive and less than the value of m-n.

When these conditions are met, the total phase voltage of the core windings of the generators 1 and 2 in general will be equal to

UM | 4 / t; 2U sin (w0t + tlra.n- (N-1) m3) -) tcos (.w6t - (. M-1) n h f) If we consider that φ (.2 | G / tn and C, xlm -n l 2fi, TO the resulting expression can be written

71 UM t 2UrosinKt- (N-1) -i

jccostuJ6t- (M-1) -,

those. in each group (M const), the beats in all n phases of the groups will be in-phase, and the EMF of the phases of the carrier will be symmetrical and shifted by the phase angle of electric radians.

On the other hand, the beat nodes of the emf of like phases (N constJ groups will be symmetrically shifted by a constant phase angle 2iT / m.

When and (Fig. 1) the phases are combined into the first group in the twelve-phase winding system of the generators 1 and 2.

0

five

five

to “1 K. 1 + (Nr m + Im (

(T N L N

+ Im-n; K ,, rteKiirf 1,4,7JO.

The value of I is taken equal to Oh

since K1 and K are more zero and less.

The second group combines the phase windings of the generator 1.

Kt2 + (m + n + I-ra-n 5 + 3 (N-1) + + 1-t-.n.

15

We get the number of phases K 5, K

9, K,

Hi

K t-8

 + (N-1) mn + I-mn -3 + 3 (N-U +

4Z3 11, К1г + 14. Since the values KiЈ, Kf7l and Kfl3 are greater than 0 and less than m-n, we accept, and. The value K np, therefore, according to the formulated rule, should be accepted. New value Km 14-1-3-4 2.

The winding numbers of the generator 2 are combined into a second group of windings.

V

+ 1-m.

We get the phase numbers of the second generator,, Cg-ge 3, Cg14 6 dl. Since K1a, 0 and we accept and receive the numbers K17, -3 + b and K 1ha 0 + 1-3-4 12. The values of K and K remain without change.

The third group combines the phase windings of the generator 1.

  1 + (N-1) .ra + 2n + I.m. + (+

+1 -m-n.

The numbers of the windings of the generator 1, united in the third group of windings,

Kf3, 9 K,,

Since Kt347in.n also accept and receive numbers, K, 6 Numbers of generator windings 2, combined into the third group of windings,

K {3 + (N-1) ra-2n + Im + (N-1) - 3,

those.

To determine the correct values, K, Kr 3 g and K 153 are taken, we get

K

The number of phases of the load m is set by the technical requirements of the installation, and the number of phase windings in group n is chosen on the basis of manufacturability.

Verification of manufacturability is carried out with two criteria - the possibility of placing a symmetric T "n-phase winding for a given number of slots

e

1577019

generators

1 and 2, which is verified by

five

 the condition 2pn} -n q Z, and the condition for the placement of symmetric hectare n-phs: x systems in independent phase zones, which ensures that only two sides of the sections of the corresponding two-layer winding or one side are laid in the slots of the core / single-layer sections. The last condition is fulfilled with, where, 2,3 ,.

The conditions are performed with the following phase combinations.

First group ()

.7- Second group ()

7.1 and 1.4. Third group ()

TO

13N

 7.1,4, 7.1;

Ensuring the symmetry of the phases of the load and in the group of each phase when possible only when laying sections of different phases in the same grooves, which reduces manufacturability and degrades the fill ratio of the groove.

Claims (1)

Invention Formula A device for obtaining a phase current of stable frequency, containing a drive motor and two generators mounted on a common shaft, whose excitation windings are multiphase, are connected in series or parallel with the reverse order of phase alternation and are connected to a low-power source of stable frequency voltage, core The windings of each of the generators contain mm phases with numbers from 1 to mn, combined into ha phase groups, each of the ha phase groups of the n-phase windings of the first machine is connected into a star, beginning Each of the m-n-phase groups of the core winding of the second generator is connected to one the ends of the root winding of the first generator, the phases of the m + 1 group of phases are shifted relative to the phases of the same group of phases, the ends of each group of phases are connected to a semiconductor switch, characterized in that, to improve the manufacturability of the device, the ends phases with numbers K, 1 + (N-1) m + + (M-1) -n + I1. mn of the first generator are connected to the beginnings of the phases with the numbers (N-1) -ra- (Ml).-n of the second generator, where, 2, ..., w is the sequence number of the group of phases,, 2, ..., n is the phase sequence number in the group of phases,  when K, ha-.p, with, I, for the remaining values of Kt  and K for any values, n $ 2, n is not a multiple of t.