RU2494516C2 - Stator of electrical machine and unit of its outer ring fixation - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: proposed stator of an electrical machine comprises a laminated core (1), in the back of which there are ventilation channels (6). In a basket (7) of head parts of the winding there are passages (8). Head parts of the winding are placed between inner (9) and outer (10) rings. Between the outer ring (10) and the basket (7) of head parts of the winding there are radial ribs (11), and cavities (12) are produced. On ribs (11) there are head parts of the winding. Channels 6 communicate with cavities (12). In the inner ring (9) there are ventilation holes (13), in the outer ring (10) - ventilation holes (14). The outer ring (10) is fixed on the stator body (2) with the help of pins (15) with threaded ends. At one end of the pin (15) there is a nut (16), fixed on the body (2), and the other end via a bushing (17) is connected to the specified outer ring (10).

EFFECT: increased efficiency of electrical machine stator cooling and reduced vibration of head parts of a stator winding.

2 cl, 1 dwg

Description

The technical solution relates to the field of electrical engineering and relates to the design of the stator of an electric machine of high power, in particular an air-cooled turbogenerator.

Known stator of an electric machine [1], in which the frontal parts of the winding are placed between the outer and inner rings and are drawn to the conical surface of the outer ring. The outer ring is fixed through the console to the pressure plate.

The design of the stator of an electric machine [2], comprising a housing, a core with a winding and ventilation ducts, was adopted as a prototype. The frontal parts of the winding have the shape of a basket, in which the passages are not used for ventilation, as they are filled with putty, fastening the frontal parts of the winding with the outer ring and with each other. The frontal parts of the winding are laid on the conical surface of the outer ring and are tightened by the inner ring. The outer ring through the bracket is fixed to the pressure plate of the core, the core is installed in the stator housing.

Known solutions provide a sufficiently reliable fastening of the frontal parts of the windings of an electric machine of high power, but the absence of channels for the passage of air through the frontal parts of the windings makes them inapplicable for air-cooled machines.

For the prototype for the attachment point of the outer ring, the design [3] with two outer rings covering the frontal parts of the winding was selected. To fasten the rings to the body and the pressure ring, elastic plate elements are used, fastened with bolts, the axes of which are oriented parallel to the axis of the machine.

The disadvantage of the mount is that within the gaps; axial bolt joint possible radial movement of the elastic elements and with them the frontal parts of the stator winding, having the character of vibration.

The aim of the proposed solution is to achieve effective cooling of the stator of an electric machine and reduce vibration of the frontal parts of the winding.

This goal is achieved due to the fact that in the stator of an electric machine containing a housing, a core with ventilation channels, a winding, the frontal parts of which are in the form of a basket, an outer and inner ring for attaching the frontal parts of the winding, the attachment unit of the outer ring to the housing, in the said inner ventilation holes are made in the ring, and cavities between the basket and the outer ring communicating through passages in the basket with ventilation holes in the inner ring, the cavities being opposite the outlet the core of the ventilation channels. Ventilation holes communicating with cavities can also be made in the outer ring.

This goal is also achieved due to the fact that in the attachment site of the outer ring to the stator housing of the electric machine containing elastic elements, each of which is fixed at one end to the housing and the other end to the outer ring, said elastic element is made in the form of a stud, for example , with threaded ends, one of which has a nut fixed to the housing.

The prior art does not reveal:

- holes in the inner ring,

- the presence of a ventilation path from the core channels through the cavity between the basket and the outer ring into the holes in the inner ring and additionally into the holes in the outer ring,

- execution of the elastic element in the form of a hairpin.

The invention is illustrated by the drawing, which shows a fragment of a longitudinal section of the stator core of an electric machine in the area of the frontal parts of the winding.

The stator of the electric machine contains a lined core 1 located inside the cylindrical body 2. Pressing elements 3 are installed from the ends of the core 1. The winding 4 is laid in the grooves 5 of the core 1. In the back of the core 1 are made ventilation channels 6, for example axial. In the basket 7 of the frontal parts of the winding there are passages 8. The frontal parts of the winding are placed between the inner 9 and outer 10 rings. Between the outer ring 10 and the basket 7 of the frontal parts of the winding, radial ribs 11 are installed and cavities 12 are formed. On the ribs 11, the frontal parts of the winding are tied. The channels 6 of the core 1 are in communication with the cavities 12. In the inner ring 9 there are ventilation holes 13, in the outer ring 10 there are ventilation holes 14. The outer ring 10 is fixed to the stator housing 2 by means of studs 15 with threaded ends. A nut 16 is screwed onto one end of the stud 15 and secured to the housing 2, and the other end is connected to the outer ring 10 through the sleeve 17. For example, epoxy adhesive can be used to install the sleeve 17 on the ring 10. In the drawing, arrows indicate the direction of movement of the cooling stream.

The studs 15 provide the necessary degree of rigidity of the frontal parts of the winding 4. The nut 16 controls the installation of the frontal parts of the windings fixed and placed between the rings 9 and 10, as well as their possible displacement.

The air coming out of the stator ventilation ducts 6 enters the cavity 12, passes along the outer surface of the frontal parts of the winding and through the openings 8 of the basket and hole 13 enters the space from the side of the stator bore, and through openings 14 into the space from the side of the housing 2. Ventilation openings 14 serve to bypass the excess air coming from the axial channels 6. Part of the air from the channels 6 enters the transition zone of the winding 4 from the groove part to the frontal and leaves the space from the side of the bore.

The technical advantages of the claimed solution are effective cooling of the stator of the electric machine and reduction of vibration of the frontal parts of the winding.

Information sources

1. Patent SN615055, IPC Н02К 3/50, priority dated 02.24.1977, published on 12.28.1979, Electrosila company.

2. Handbook of electric machines, edited by I.P. Kopylova, t.1, M, Energoatomizdat, 1988, p. 148, subsection 8.2.5, fig. 8.4.

3. Patent US 5693996, IPC Н02К 3/46, priority dated March 29, 1995, published December 2, 1997, ABB.

4. Patent US 7763996, IPC Н02К 9/00, priority from 08.25.2008, published 07.27.2010, General Electric.

5. Patent US 5485050, IPC Н02К 3/46, priority dated February 26, 1994, published January 16, 1996, by ABB.

6. Patent US 5140740, IPC Н02К 15/14, priority dated 12/13/1990, published on 08/25/1992.

7. Patent US 3991334, Н02К 3/46, priority date 01/23/1975, published July 31, 1997, Westinghouse.

8. Patent GB 921126, IPC Н02К, priority dated October 31, 1959, published March 13, 1963, by ABB.

9. Patent JP 4109067, IPC Н02К 3/50, priority dated September 30, 2002, published April 22, 2004, by Hitachi.

10. Patent DE 19732949, IPC Н02К 5/20, priority dated July 31, 1997, published February 4, 1999, by ABB.

11. Patent DE 1286198, IPC Н02К, priority dated 12.24.1964, published 02.01.1969, company ABB.

12. Patent application DE 102007004449, Н02К 3/50, priority dated March 30, 2006, published October 4, 2007, by Alstom.

13. Copyright certificate SU 1767620, Н02К 3/50, priority date 08.08.1990, published 07.10.1992, Electrosila company.

14. Copyright certificate SU 743119, Н02К 3/50, priority 09/17/1973, published on 06/25/1980, Electrosila company.

Claims (3)

1. The stator of an electric machine, comprising a housing, a core with ventilation channels, a winding whose frontal parts are in the form of a basket, an outer and inner ring for attaching the frontal parts of the winding, an attachment unit of the outer ring to the housing, characterized in that the ventilation rings are made in the inner ring and between the basket and the outer ring - the cavity communicating through the passages in the basket with ventilation holes in the inner ring, and these cavities are located opposite the exit of the ventilation ducts in the core. 2. The stator according to claim 1, characterized in that in the outer ring there are ventilation openings with which the cavities communicate. 3. The attachment of the outer ring to the stator housing of the electric machine, containing elastic elements, each of which is fixed at one end to the housing, and the other to the outer ring, characterized in that the elastic element is made in the form of a stud with threaded ends, on one of which The nut fixed on the body is placed.

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