RU2258294C1 - Air-cooled electrical machine - Google Patents

Abstract

FIELD: electromechanical engineering; air-cooled electrical machines.

SUBSTANCE: proposed electrical machine has stator frame 1 with air duct 2 and stator core with air vane 3. Air vane 3 has distance piece 4 and air vane sheet. Distance pieces 4 organizing radial cooling ducts in stator core are flexible steel sections designed to organize radial cooling ducts in stator core, minimum 10 mm wide, and are locked in air vane sheet notches. Bends disposed on distance piece 4 and notches on air vane sheet ensure sealing between distance piece and stator frame.

EFFECT: enhanced reliability of cooling system and improved electromagnetic characteristics of machine.

1 cl, 3 dwg

Description

The invention relates to the field of electrical engineering and can be used in electric machines with air cooling, in particular in the construction of anemone ventilation channels of the stator cores with radial ventilation.

The design of anemones is known (see, for example, Alekseev A.E. "Design of electrical machines", SEI, 1958, p.370, Fig. 11-23a), adopted as a prototype, in which the remote plates of anemones (spacers) are made of profile rolled (I-beam) and fixed on the sheet of anemone by contact welding.

The disadvantages of this design of anemones is that:

- it is impossible to make a ventilation duct with a width of less than 10 mm, as is the case with some electric machines, since there is no I-beam with a height of less than 10 mm according to GOST 8239;

- there is no possibility of using anemones of this design in electric machines, where a seal between the stator housing and the anemone spacers is required to ensure the tightness of the ventilation duct.

The objectives of the invention are:

- providing the ability to perform ventilation ducts with a width of less than 10 mm to improve stator cooling due to the development of cooling surfaces, reducing the thermal resistance of the stator iron package and reducing the resistance to magnetic flux in the air gap of the electric machine while maintaining the stator core length and improving the electromagnetic characteristics of the machine;

- providing a seal between the spacers of the anemone and the stator housing.

The technical result is achieved by the fact that the air-cooled electric machine comprises a stator housing, a stator core with anemones, remote anemone spacers creating radial ventilation ducts in the stator core, anemone remote spacers made with bends from a steel profile of the required section with the possibility of providing radial ventilation ducts in the stator core is less than 10 mm wide and fixed in the notches of the anemone sheet, and the location of the bends on a remote strut e and the notches on the anemone sheet provides a seal between the remote spacer of the anemone and the stator housing.

Figure 1 shows the stator core with anemone in an electric machine with radial ventilation.

Figure 2 shows a cross-section along aa of Figure 1 with a remote strut anemone of circular cross section.

Figure 3 shows a cross section along aa of Figure 1 with a remote spacer of anemone of rectangular cross section.

The electric machine contains a stator housing 1 with an air duct 2, a stator core with anemones 3. Anemone 3 consists of a distance spacer 4 with bends B (Fig. 1) made of profile steel (round, rectangular or any other shape) with a profile height of less than 10 mm , and the sheet of anemone 5. The distance strut 4 from movements on the sheet of anemone 5 is fixed by resistance welding and notches (Figs. 2, 3), which are located on the sheet of anemone 5 in such a way that in combination with bends B of the distance strut 4 provide a minimum clearance In (Figure 1) or the minimum interference between the upper shelf of the distance strut 4 and the duct 2, thereby creating the tightness of the duct 2. As an example, figure 2 and Figure 3 shows the distance struts 4 on a sheet of anemone 5 of rectangular and circular cross-section.

EFFECT: invention makes it possible to provide a seal between anemone 3 and air duct 2 of stator housing 1 and to perform radial ventilation channels of the stator core with a width of less than 10 mm, which improves cooling of the stator by increasing cooling surfaces, reduces the magnetic resistance of the air gap between the rotor and stator of the electric machine and thereby improves the electromagnetic characteristics of the machine.

This design of anemone is implemented in the engine cooling system of the ATD4 series of type 4AZM1 with a capacity of 315-500 kW.

Claims (1)

An air-cooled electric machine comprising a stator housing, a stator core with anemones, remote anemone spacers creating radial ventilation ducts in the stator core, characterized in that the remote anemone spacers are made with bends from a steel profile of the required section shape with the possibility of providing radial ventilation ducts in the stator core is less than 10 mm wide and fixed in the notches of the anemone sheet, and the location of the bends on the distance strut and notches on An anemone sheet provides a seal between the remote spacer of the anemone and the stator housing.

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