SU758392A1 - Three-phase winding with switching-over poles without power supply interruption - Google Patents

Description

The invention relates to the field of electrical engineering and is intended for use in electric AC machines with step speed control. five

Two-speed winding circuits are known, connected in six branches, the pole numbers of which are switched in the range of ratios from 1: 2 to 1: 4, and switching is performed by 1 * changing the direction of the Current in part of the sections, ^ and in the process of switching at least a short power break is necessary [one].

one;

Also known winding performed among the grooves fold 36, the switching number of poles which is carried out in respect of p _1: p _th containing uniformly distributed 2Ι to the yoke coil groups united six semi-phase, without power interruption by means of connection terminals of the midpoints of the sides, " triangle "to the terminals of the ^anti-2 lying vertices [2]. The specified winding is the closest technical solution to the Invention to the essence and to the problem being solved and contains evenly distributed on magic.

2

'' '' ‘" - {,. · ''

The conductor is a coil group, combined into six semi-phases. '

The disadvantages of the considered winding include a low level of winding coefficients for working harmonics, which leads, especially in combination with the manifestation of asymmetry at 2p = 2, to under-use of active materials of two-speed engines and an overestimation of material intensity per unit of power. The need for a change in the phase rotation and the opening of the power supply circuit in the drives of mechanisms with counter-rotation of the working element at different speeds is accelerating! contact wear and reduce the reliability of the switching control circuit .. '

The purpose of the Invention is to increase the efficiency of the use of active materials, as well as increase the reliability of the Drive mechanisms with counter-rotation of the working body at different speeds at a speed ratio of 2: 1, 2: 7.

The goal is achieved by choosing the pattern of placement of the coil groups along six branches of the circuit

switching with preservation of symmetry

ns in phases at all poles and

3

758392

four

it is advisable to interconnect them ₄ , for which each branch contains

coil groups with numbers determined by the expressions:

G ⁷ ♦ (t-p _g > 1.5+ (p-s) -5-uo e-pKeg ^ Chain ^ er ^) · [-14+ (n-1) '5-zooper (|) Zepg-1g ( p _g / 5) * [18 + (n-1), ₅ -30e _te r)} ep1 _(e g (p _g / _{5). (}

* and coil groups with numbers

[7 ⁺ (7 ~ P _g ) 1.5+ (p-1) • O-3U Uni'vg ^ Dphpvg ^ ¹ )

p \ 20

, [25- (7-p _g У1 ₁ 5 ⁺ 1п-1) -5-попг1еА7 ¹ )] vpgteg5 ^g )

included counter relative to the remaining coils of the branches, where η is the number of the branch; - the second number of pairs is 25 LUSES.

In addition, when performing windings on ratios 2: 5 and 2: 7, the coil groups with the numbers 1 + (η -1) x х 5 ^ 1: 16 ^ 0 ^ / 5) / contain twice the 30 number of coils than the rest , containing T coils in the group, where T · When winding is performed at a ratio of 2: 1, the number of coils in the coil group is 6T, with even 35 coil groups included opposite to odd coil groups.

FIG. 1 shows a circuit switching branches; in fig. 2 - scheme-raz.-Winding winding for p ₁ : = 1: 2; on

FIG. 3 - electric circuit of coil winding groups of connections with the relation: p ^ = 2: 7; in fig. 4 scheme-scan winding for p ₁ : p _g = 2: 7; in fig. 5 - electrical circuit of connection of coil winding coil groups with the ratio p ₁ : p „2: 5; see 6shemaraEvertka · windings for p _p : p _r = 2: 5.

For operation of the circuit with a large number of poles, power is supplied to the terminal 50 A, B, C when the phases are connected to Δ. For switching the winding to a higher speed, the clips Aa are pairwise closed,

In-b, C-s without interruption of power. The connection diagram of the phases in this case is ΔΔ. 55

c p and meer. The layout of the coil & x groups along the branches of the switching circuit for the winding performed in 36 slots with the ratio of the numbers of poles 2ρ _ν : 2p _g = 4: 2. Number

and the whole part of the fraction - ^ vpHyvg

Coil groups are the same and contain 6T = 6 coils. The number of coils in this case coincides with the number of branches of the circuit and is equal to six. The number of the coil group, defined by

60

(£) * ° ’

1+ (p-1), where η = 1,2,3,4,5,6, coincides with the branch number. Coil groups with numbers 2,4,6 'are included in opposite coil groups 1,3,5 ·

In FIG. 1, a circuit switching branches for the considered ratio of the poles 2p ^: 2p ^ = 4: 2, where the coil groups are depicted in the form of rectangles, and the beginning marked with the letter "H".

Consider the schematic scan of this winding (see Fig. 2). When three-phase power is applied to terminals A, B, C, the circuit provides for the creation of a magnetic rotating field with the number of poles of 2p _g . =. 4. Pairing the connection of the terminals A-a, B-b, C-c without breaking the power circuit leads to a change in the number of poles by 2 p., = 2.

The resulting winding is completely symmetrical on both poles. At step y = 10, its winding coefficients are: Kuu = 0.732;

> H / _g = 4 = 0.7 09.

The average winding coefficient KchUsr equal to 0.7205, which is 5.4% more than in the prototype, where = 0,691;

^to w / grm = 0.676; K ^ _p = 0.6835 with a winding step y = 1 1.

Example 2 Layout of coil groups on branches of the switching circuit for the winding performed in the 36 • slots with a pole number 2p ratio of _{l: r} = 2p 4:14. Number t = = 1

The whole part of the fraction =

The distribution of coil groups in the winding branches. 1st branch - η = 1.

5 ⁶ⁿ " ^{, er} ^ ^R g / ⁵ )"

[ζ f-P _x ) Ö Oppieg (§] ep1 (eg (- ^) '7,

[44 ⁺ (p-1) 5-Mepenberg (~ 5ggg (p ,, / 5) = 14,

[ιβ + (n-1) · 5-bo e eb (5 er ep (p _2/5) = - ₁₈ July

[25 - (7- р _г ) · ι, 5+ (п -1) · 5 -зоедф -ί)] β.ϊΛΐ

= 25,.

those. The 1st branch of the switching circuit includes coil groups with numbers

I, 6.14,18 and 25.

. Similarly, we perform the calculation for the remaining branches, giving η the values of the branch number.

Thus, the 2nd branch (n »2) includes coil groups with numbers 6,12,19,23,30; in the 3rd branch (π · »3) II, 17,24,28 and 5; in the 4th branch - 16,22, 29,3,10; in the 5th branch - 21,27,4,8,16; / 'in the 6th branch - 26,2,9,13,20.

Reel groups with numbers

^ (ΐ-ρ ^ -Ι, δψι-ΐΙ’δ-ίΟθηΙΐβΓ ^^ νιΐίβΓ- ^)

"Ον

[25- (7- (¾) ί, 5 * (πί) 5 -5о «pyg (- ¹ ^ ¹ -) epp. Ry (^ -)

included counter to the other coil groups of branches. Pod5 758392

putting in these expressions in turn the values η = 1,2, ..., 6, we get the following numbers of coils: 7,25,6,30,11, 5,16,10,21,15,26,20.

The connection diagram {of coil groups 5 of the considered winding · with a pole ratio of 2p _t : 2p _g = 4:14 is shown in FIG. 3. When power is applied to the terminals A, B, C, the circuit works with the number of poles 2p _d = 14. To reconnect, n to the number of poles 2p ^ = 4 close the terminals A-a, B-b, C-s without breaking the power circuit.

. Coil groups with numbers ΐ + (η - l \ 5 ^e From / 5)>

those. 1,6,11,16,21 and 26 contain twice as many as the other 20 coil groups, the number of coils equal to 2Т = 2. The schematic scan of this winding is shown in FIG. 4. Winding factors at step y = 8 are:

= 0.7907; "0.8186; 25

Kch / Wed = 0,804.

FIG. 5 shows the connection diagram of the coil winding groups with the ratio of the poles 2p.,: 2p _y = 4: GO. 30 Calculation is made similarly to the considered example.

The schematic scan of this winding is shown in FIG. 6. Winding coefficients at step y = 11 are equal: 35

= ° - ^7θ : ^K ^ y = 0-733;

Kch (cf = 0.7565-.

These pole-switched windings are symmetrical and are distinguished by higher (5–15%) winding coefficients compared with the prototype, which makes it possible to reduce the consumption of materials per unit power of two-speed electric motors. Winding 45 can be used in motors with pole switching, with braking. opposition (at the numbers of poles 2: 4 and 4:14) without disconnecting from the network. To control the motor winding according to the present invention requires one of the half-power starters, which in some cases will allow the use of a smaller starter.

6

Claims (2)

Claim 1. Three-phase winding with switching poles without interruption of power in the relationship, performed in the number of slots in multiples of 36, containing the coil groups evenly distributed on the magnetic core, connected in six half-mounds, forming with a larger number of poles a "triangle" circuit with leads from its vertices and midpoints of the sides connected to the conclusions of the opposite vertices of the "triangle" on a Fewer number of poles, characterized in that, in order to reduce the material intensity of a unit of power of two-speed electric motors, each semi-phases It includes coil groups with numbers defined by the expressions: -1+ (p-1) · 5 ^ (ΐ4 + (π- £) 5 - zo · εκίΐβ)] β «ΐί er (y), [ιβ ⁺ (η-ή ⁵ ~ P _d ) · ι, 5 ⁺ (η-1) · 5 - yo-en! ί e d) end1 (^) ( ’^ H moreover, the coil groups with the numbers [ ⁷ Ψ - Pr) · ¹ - ^{5 +} (n-1> 5-Béb11eg®] εg <er (£ ^g ), [25 * (7 - р ₂ У 1,5 ⁴ (п - л)> 5 - 30еп1: е г (^ -)] ep11г (^ ^г ) included counter relative to the rest of the coil groups of branches. 2. Winding according to claim. 1, characterized in that when performed on the ratio of the poles' 2: 5 and. 2: 7 katuya .- ^. neck groups with numbers. 1 - "(p-1) 5 ^Her1 " cnR "contain twice as many coils as the others, containing T coils, where Ρ-, is less than the number of pole pairs; p _g - a greater number of pairs of poles; η - branch number; T -; ζ - number stator slots.