SU955378A1 - Closed electric machine - Google Patents

Description

(54) CLOSED ELECTRIC MACHINE

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This invention relates to electrical engineering and can be used to create closed, blown, explosion-proof and sealed AC electrical machines.

Closed air-cooled electric machines are known by circulating the internal air of the machine through a cooler on the outer surface of the housing, the electromagnetic gap and the ventilation ducts in the active parts of the Sch.

A disadvantage of the known electric machine is the relatively low cooling efficiency due to the low heat capacity of the air.

Also known are designs of enclosed electric machines with a hermetic partition passing through the electromagnetic gap and separating the stator from the rotor and forming in the zone of the frontal parts of the separator winding a closed cavity filled with a cooling stator with a ferromagnetic liquid 2.

However, the disadvantage of this constructive is the increased magnitude of the total electromagnetic gap, the folding of the thickness of the bulkhead and the gap between the rotor and the bulkhead, which degrades the performance of the machine due to the increased magnetizing. current and eddy current losses in the sealing wall.

In addition, the cooling efficiency of the machine is insufficient due to the lack of closed circulation.

10 coolant through the active parts of the machine and insufficient heat removal from the slot part of the stator winding and the absence of heat removal from the rotor surface.

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The purpose of the invention is to improve the energy characteristics of the back of an electric machine and increase the intensity of its cooling.

This goal is achieved by

Claims (2)

20 that in a closed electric machine containing a stator with a winding cooled by ferromagnetic fluid and a rotor located in a housing, permanent magnets with pole tips are fixed at the ends of the housing, and ferromagnetic discs are formed on the rotor shaft, forming annular gaps filled with pole pieces ferromagnetic liquid. Figure 1 shows the proposed machine, a General view, figure 2 - part of the machine, side view. The machine contains a stator 1 with a winding 2, cooled by ferromagnetic fluid 3, filling part of the internal space of the machine and a rotor 4 mounted in housing 5. At the ends of the hull 5 of the housing 5 ring permanent magnets 7 with pole tips 8 are mounted. On the rotor shaft 4 ferromagnetic disks 8 forming a c.:; polar tips 9 annular gaps 10 filled with ferromagnetic liquid 3. Each permanent magnet 7 is magnetized radially so that its outer and inner cylindrical surfaces are vipote cially surfaces of different polarity (Figure 2), creating a magnetic flux F radis1lny, mutable its direction in the pole nakonechnikah- 8 and penetrating the annular gap 10 in the axial direction and a ferromagnetic disk zamykayuschiys 9. Threaded rotor 4 is adjoined by thin-walled cylinders 11 mounted on the radial surface of disks 9 and forming winding 2 with frontal parts channels 12 connecting the electromagnetic gap 13 of the machine with cavity 14 between the ends 5 of the housing 5 / and the ends of the stator 1 / as well channels 15 on the inner cylindrical surface of the housing 5 filled with ferromagnetic liquid 3. When the machine is operating, ferromagnetic liquid 3 circulates in the internal space of the machine through channels 12 and 15 and the electromagnetic gap 13 of the machine, carried out intense mp eat with the hottest active surfaces 16 and 17 of stator 1 and Ro torus 4 and 5 transfers heat to the body, the cooling fan 18, the outdoor blower. In this case, the magnetic flux Φ of each of the permanent magnets 7 reliably holds the ferromagnets. liquid 3 in the gaps 10, providing a seal of the internal space of the machine. The installation of permanent magnets with pole lugs forming annular gaps filled with ferromagnetic liquid with ferromagnetic disks mounted on the shaft on the ends of the case of the body allows. to seal the internal cavity of the machine by means of magnetic-liquid seals and to remove from the structure a hermetic partition between the stator and the rotor, which eliminates losses in the sealing partition and reduces the total electromagnetic gap. This significantly increases the efficiency and cos cp of the machine with a sealed stator. In addition, the ferromagnetic fluid is allowed to enter the electromagnetic gap, which also, in turn, reduces the magnetizing current and allows for intense heat removal from the most heated active surfaces of the stator and rotor, and also provides for the circulation of liquid. inside the machine throughout its length, which significantly intensifies the heat sink. Claims. An electric machine is closed, containing a stator located in separate cavities with a winding cooled by a ferromagnetic fluid, and a rotor, which, in order to improve energy performance and increase the cooling intensity, permanent pole magnets are installed on the ends of the case facing the rotor tips, and on the shaft - ferromagnetic disks, which form polar tips with magnetic tips and ferromagnetic fluid in the gap between them. Sources of information taken into account in the examination. 1. Turin Ya.S., Kuznetsov B.I. Designing a series of electric cars. M., Energie, 1978, pp. 58-59. 2. USSR author's certificate 534833, cl. H 02 K 9/197, 1976.