RU124853U1 - ELECTRIC MACHINE - Google Patents

Abstract

1. An electric machine, comprising a casing with an opening communicating with the chamber of the two-sided end supply of the cooling flow to the rotor, and an opening communicating with the chamber of the cooling flow from the stator housing, a stator with ventilation channels open on one side to the air gap, on the other - in the exhaust chamber through the outlet in the Central part of the stator housing, a nozzle, characterized in that the rotor has axial ventilation ducts open on one side of the feed chamber, and on the other through radial ventilation channels in the rotor into the air gap, the ends of the stator housing are connected to the casing and inlets are made into the stator housing. 2. The electric machine according to claim 1, characterized in that the pipe is formed by a box placed on each side surface of the housing and partitions joined with it.

Description

The claimed technical solution relates to the field of electrical engineering and relates to an electric machine with open-loop ventilation, in particular an explicit pole generator.

A known electric machine with a ventilation module located on its housing with openings for two-way supply of cooling air to the case and two-way exhaust from it [1]. The air entering the housing passes through the axial and radial channels of the rotor, through the air gap and through the radial channels of the stator it exits from the back of the stator core. The system of partitions in the module organizes the direction of cold and hot flows and eliminates their mixing. Since the piping system to each feed / outlet opening has a complex configuration and additional accessories, a large space is required around the machine.

An electric machine [2] was adopted as a prototype with the supply of cooling air through an opening from one end of the outer casing and exhaust through an opening from its other end. The supply opening communicates with the cooling flow supply chamber to the stator housing, the exhaust opening - to the cooling flow discharge chamber from the housing. The cooling stream injected by the fans from the feed chamber into the stator housing enters the air gap from two sides: on the one hand, by the vertical flow, on the other hand, by installing branch pipes with a horizontal flow above the stator housing. The radial ventilation ducts of the stator are open on one side into the air gap, and on the other hand through openings in the central part of the surface of the stator housing into the exhaust chamber. This ventilation scheme is associated with fewer auxiliary equipment for an electric machine, allowing you to place it on a smaller area in operation. However, the small size of the air gap does not ensure that a sufficient amount of cooling air enters the stator, while the rotor is cooled only along the back of the core. The inefficiency of cooling the stator and rotor limits the use of the known ventilation scheme for high power machines. In addition, the design of the stator housing in the dimensions of the stator core requires the presence of pressure and coupling elements that complicate and aggravate the housing design.

The objective of the proposed technical solution is to increase the cooling efficiency of an electric machine with the possibility of increasing its unit power, as well as simplifying the design.

The problem is achieved due to the fact that in an electric machine containing a casing with a hole communicating with the chamber of the two-sided end supply of the cooling stream to the rotor, and a hole communicating with the chamber of the cooling stream from the stator housing, the stator with ventilation channels open on one side into the air gap, on the other hand, into the exhaust chamber through the outlet openings in the central part of the stator housing, pipe, axial ventilation channels are made in the rotor, open on one side to the chamber under Chi, on the other hand - via formed in the rotor radial vents in the air gap, the ends of the stator casing are joined to the casing and in which an inlet in the stator housing. The pipe may be formed by boxes placed on each side surface of the housing and partitions joined with it.

The prior art does not reveal the combination of the connection of the cooling flow supply chamber with the axial-radial ventilation channels of the rotor through the radial holes on the surface of the end parts of the housing.

The technical solution is illustrated by drawings, where figure 1 shows a General view of an electric machine; figure 2 is a longitudinal section, view aa in figure 1; figure 3 is a fragment of a cross section of a rotor. In the drawings, the movement of the cooling flow is shown by arrows.

The electric machine includes a casing 1 (see Fig. 1, shown without side sheathing) with end shields 2, in the upper part of one of which a hole 3 for supplying a cooling stream to the machine is made, in the upper part of the other, an opening 4 for removing the cooling stream. The stator housing 5 is docked with the end shields 2. To supply the cooling flow to the stator housing 5, radial inlets 6 are made in its end parts, and radial outlet openings 7 are made in the central part 7. The space between the casing 1 and the stator housing 5 is divided into a chamber 8 supply of a cooling stream to the stator housing 5 and the chamber 9 of the cooling stream from it. A pipe 10 is placed on the surface of the stator housing 5. A box 11 of the pipe covers the outlet openings 7 on each side of the housing 5 without blocking the communication through the feed chamber 8 of the openings 3 with the inlet openings 6 on each side of the stator housing. The box 11 and the partitions 12 and 13 of the pipe block the communication of the openings 3 with the exhaust chamber 9 and the openings 4 with the feed chamber 8. Axial channels 14 (see FIG. 2) of the rotor yoke 15, on the one hand, are connected to the feed chamber 8 through inlet openings 6 , on the other hand, through the radial ventilation channels 16 and 17, respectively, the yoke 15 and the poles 18 are open into the air gap 19. The radial ventilation channels 20 of the stator core 21 are open on the one hand in the gap 19, on the other hand, through the outlet openings 7 of the stator housing 5 are connected to the exhaust chamber 9. The fan 22 located on the shaft on both sides of the machine. The axial channels 14 are distributed over the cross section of the yoke 15 (see figure 3) and are located, for example, under the coils 23 of the pole winding.

Cold air is supplied to the machine through the supply opening 3. Fans 22 circulate cooling air in the electric machine. From the feed chamber 8, through the openings 6 in the stator housing, air enters the rotor from two sides through axial channels 14, into which the radial channels 16, 17 are open, cools the winding and core of the poles. Further, through the gap 19, the air enters the stator channels 20, cools the core and the winding, and through the openings 7 leaves the exhaust chamber 9. The presence of the nozzle 10 creates a directed movement of cold and hot flows and eliminates their mixing. Through hole 4, heated air is discharged from the machine.

The technical advantages of the proposed solution are effective cooling of the electric machine with the possibility of increasing its unit power. In addition, the design is simplified and the overall dimensions are reduced, which will allow the machine to be placed under various operating conditions, which is important if the equipment is replaced on the spot.

Sources of fame:

1. Patent JP 59175353, the company Yaskawa Denki Seisakusho, H02K 9/06, priority from 03/23/1983, published 04/10/1984.

2. Patent RU 2427066, Toshiba company, H02K 9/16, priority dated September 12, 2009, published August 20, 2011 (application JP 2010288392 published December 24, 2010).

3. Patent DE 4109814, company Lloyd Dynamowerke, H02K 5/24, priority from 03/26/1991, published 01/10/1992.

4. Patent US 3846651, Westinghouse, H02K 1/32, priority dated 12/06/1973, published 05/11/1974.

5. JP 58095952, Hokuetsu Kogyo, H02K 1/32, H02K 9/02, priority dated 12/03/1981, published 06/07/1983.

6. Patent US 7777374 (option in figure 1), the company Siemens, H02K 9/02, H02K 9/18, priority from 08/23/2005, published 08/17/2010.

7. Patent application US 20050206252, Siemens, H02K 9/00, priority dated March 16, 2004, published September 22, 2005.

Claims (2)

1. An electric machine, comprising a casing with an opening communicating with the chamber of the two-sided end supply of the cooling flow to the rotor, and an opening communicating with the chamber of the cooling flow from the stator housing, a stator with ventilation channels open on one side to the air gap, on the other - in the exhaust chamber through the outlet in the Central part of the stator housing, a nozzle, characterized in that the rotor has axial ventilation ducts open on one side of the feed chamber, and on the other through radial ventilation channels in the rotor into the air gap, the ends of the stator housing are connected to the casing and inlets are made in them to the stator housing. 2. The electric machine according to claim 1, characterized in that the pipe is formed placed on each side surface of the housing box and joined with partitions.

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