SU1234916A1 - Stator of electric machine - Google Patents

Abstract

The invention relates to electrical engineering and is aimed at reducing the level of vibration and noise of a stator housing with a polygon-shaped core. The elastic elements 1 of the stator suspension are placed at the corners of the core 2, i.e. in places of its maximum rigidity, and consequently, the minimum vibration. I zp f-ly, 3 ill. i (lgo with 4 with Ci (. 7

Description

The invention relates to electrical engineering and relates to a stator device of electrical magnetic with reduced levels of vibration and noise and high technological, energy and operational characteristics.

One of the most important indicators of quality e. A legal machine (EM) is the level of vibration and stator noise.

Vibration and noise of the machine have a detrimental effect on the environment, on the equipment installed and on the operating personnel.

The same important problem is the reduction of waste of materials, the achieved use of low-waste technology based on advanced design solutions.

The purpose of the invention is to reduce the level of vibration and noise of Kopriyca as applied to a stator with a polygon-shaped core.

FIG. 1 schematically shows a stator with elastic elements placed on the corners of the core; in fig. 2 - stator, in which the elastic elements are located on two opposite corners; in fig. 3 - is a cross-section of a square core and a round shaped core inscribed in it with an outer radius of 1 m.

The stator of the electric .iaiHHiiiJ contains elastic suspension elements 1, ral; - chips (Fig. I) at the corners of the core 2 MI of a carbon angle, for example, of square shape; e) The terminal 2 is installed in the case 3 ci aropM. which by means of paws 4 rasno. on (d-day 5.

bia to the circuit shown in FIG. I. Elastic elements 1 of the suspension are exchanged at the corners of the core 2 at the places of its maximum rigidity, and therefore, minimal;) vibration. The dimensions of the housing 3 of the stoyur are somewhat increased. For stators installed on the laptops, taking into account that the paws can be removed not along the entire length of the stator housing, but only in those places where there are no elastic suspension elements placed locally in certain places but the length and circumference of the core and housing The dimensions of the stator housing can be reduced by not making it with paws recessed into the housing in width where there is no suspension (for example, with the legs only in the middle part along the body or only in the end parts of the body). To maximize the vibration and noise of the stator housing of the EM, it is advisable to concentrate the elastic elements of the core suspension in the area of the supporting legs of the housing, and the elastic elements should have flexibility in the radial and tangential directions.

FIG. 2 shows the exchange of the elastic elements of the suspension 1 on two front

0

five

0

0

five

0

five

The corners of the core 2 in the area of the support paws 4 of the stator housing 3, which is mounted with the help of the legs 4 on the base (frame of the mechanism) 5, the two other corners of the core 2 and the housing 3 serve as limiters for the movement of the un-suspended core 2 when possible yziapHbix of the stator EM stresses in order to avoid damage to the elastic elements 1. The distance between the corners of the core 2 and the housing 3 (including the amount of bevel of the corners of the core) is chosen based on ensuring the required suspension of the suspension in normal operating conditions. zhimah work and save more movements of the core upon impact. In order to reduce the dimensions of the machine, the legs of the paw 4 in the places of installation of the elastic elements 1 of the suspension or along the entire length of the body 3 can be made box-shaped, as shown in FIG. 2. The dimensions of the housing 3 of the stator in this case, the APA. Yugicheskogo those nry roundpolice of the heart.

In cases where the requirements of vibration and stator e stator are provided with confidence, with the goal of reducing the level of vibration and noise of the case without increasing its dimensions, elastic suspension elements can be stirred on the lateral surfaces of the square stator core.

The dashed line in FIG. Figure 2 shows the reshaping of the elastic elements 1 of the suspension on the side surfaces of the core 2 in the stator housing 3, while the corners of the core 2 and the housing 3 are used as O1 of the upper part of the core 2 in case of possible impact surfaces. stator stator to avoid damage to the ynpyi of their e-elements 1. The distance a between the corners of the core 2 and the case 3 is selected accordingly.

The effect of lowering the level of vibration and the stator EM with an elastically shaped square core, while ensuring high technological, energy and performance indicators and characteristics is achieved in the following way. To clarify the cyniHOCTH of this series, it introduces a diagram (Fig. 3) of the cross-section of a square-shaped and round-shaped core with an outer radius R; s inscribed into this square.

The core back of a steep form has the same height h around the circumference of the core and is referred to as

,(one)

where R: -. - radius at the bottom of the grooves of the core. The radius in the middle of the back of the core is round

Ro r. + h / 2 r .-- h / 2. (2)

In the event that the square core of the back has a variable height around the circumference of the core, it reaches the maximum value at the corners of the square core and the minimum hmi .. equal to the height of the back of the round core h hniVn on its side surfaces

In this case, when rounding the angles of the core on a total area of 6% of the area of quad,

hmax V2 (l-VO, 06/4) Ra - R.

 l, 24Ra - Rz (3)

those. an increase in the height of the backrest compared with a round core is Ahmax 0.24Ra, which is quite significant.

When calculating the magnetic induction in the back of the square core and the effective value of the core vibration, the reduced value of the back height is used.

hn (hmax + hm, n), 12Rr.-R.h (4)

and reduced radius in the middle of the height of the backrest

Ron Ro + L RH, (5)

where LP 0.12 Ra - increase the height of the spin

ki

The outer radius of the equivalent core, round shape

R., R. + h R.. (6)

Increasing the height of the back of the core reduces the magnitude of the magnetic induction in the back, increases the rigidity of the core, improves its cooling conditions. By reducing the magnetic induction in the back, the losses in the steel are reduced, the efficiency of the machine is increased, the magnetic current in asynchronous machines is reduced, and the excitation current in synchronous machines, which reduces the heating of windings and their service life, and the magnetic fields decrease. emitted by the machine, the vibration of the core is reduced due to magnetostriction.

We define how many times the bending stiffness of a square core increases in comparison with a round core. Taking into account that hn h + DNP, R ™, Ro + uhn / 2 and + h / 2 with the same length and core material after performing the transformations, we obtain

CnfC (0.945 + 0.11 R.Vh) - 2, l (7), where Cn and C are respectively the reduced static stiffness of the square core and the static stiffness of the round shape core, (Ra / h 3 value corresponds to power-generating turbogenerators) . On a diagonal axis passing through the corners of a square-shaped core, its rigidity is even higher than that determined by formula (7).

The vibrations of the EM core are caused mainly by radial variable magnetic forces acting on the bore of the stator core, and coincide with them in phase. The amplitudes of the radial and tangential vibrational displacements of the core with bending vibrations under the

The effect of radial variable mechanical forces is defined as

1 + 3m-1 PoRo (n) ...

t; 7 - 1

t - 1 C (p)

l + 3m- l P, iRn (n) ,. m (m - l) C (n)

(eight)

(9)

ABOUT

0

5 o

Q

five

five

where m is the order of oscillations, (n) / / 12Ro (n); PO is the amplitude of the radial force; Kch - coefficient of dynamics.

As can be seen from expressions (7) - (9), as the core stiffness increases, its vibration and noise decrease accordingly, and in the case of a square core, the amplitude of the vibratory displacements of the side surfaces of such a core is less than the outer surface of a round core inscribed in this square, and the amplitudes of vibration 1x displacements of the corners of a square core, in turn, are smaller than the lateral surfaces of it.

The placement of elastic elements between the outer surface of the core and the housing — the elastic suspension of the heart in the stator housing allows to significantly reduce the level of vibration transmitted from the core to the stator housing, pa value of the coefficient of transmission of vibration Кп. characterizing the effectiveness of the suspension. The amplitude of the vibratory movement of the body in this case is HBXO.IHTCH according to the formula

  .(ten)

The value of the coefficient K determined by the elasticity of the elastic elements of the suspension and is usually about an eye of 0.4. which gives a reduction in the vibration of the body compared to the core by 2.5 times or 8 dB. Accordingly, the level of air flow is reduced. created by; 1blc) HOBCJIX-stator housing.

For an EM stator with a gray polygonal, e.g. square) shape, the vibration level and the P1MA case;) in the chip from the stator with a round core (| 1 form depends on the location on the square heart), suspension elements.

In the proposed construction of the EL stator, when the elastic elements of the suspension are mounted on the side surfaces of the square core, vibration and the stator case (bed) Hiy.M due to the greater rigidity of the core are reduced not less than 2 times (by 6 dB) compared to the stator with the core circle .yu form, inscribed in this square, and the suspension of the same efficiency. In the placement of elastic suspension elements of a pa lph corner of a polygonal core at the places of its maxim ... stiffness with the same effect and biostop of the suspension, the level of vibration and PM of the stator Cornus

(ciaiiHiibi) decreases to an even greater degree (by no less than 3 times or 10 dB). The technical and economic effect of the introduction of the proposed invention consists in reducing the level of vibration and noise of the stator housing (frame) of the EM, in terms of its reliability and durability, in protecting the environment and the staff from the harmful effects of vibration, and energy and performance indicators and characteristics of the machine.

Claims (2)

Invention Formula . A stator of an electric machine, comprising a housing with a stator core and elastic suspension elements disposed therein, characterized in that, in order to reduce vibration and noise of the housing as applied to a stator with a polygon-shaped core, elastic suspension elements are installed at the corners of the core. 2. The stator according to claim 1, characterized in that the elastic suspension elements are mounted on two opposite corners of the core. FIG. 2 Fig .. 3 Editor Y. Sreda Order 270.3 / 55 (L1s | -; n gge.ch F. Pidoleka I. Be |) ecorrector. 11emchik Circulation B31 Subscription VNIIPI USSR State Committee for inventions and discoveries I 1303.5,. SOCA, Ж-35, Raushsk nab., 4/5 Branch PPP "Patent, Uzhgorod, st. Project, 4