RU114566U1 - LIQUID COOLED ELECTRIC MACHINE ROTOR - Google Patents

Abstract

The rotor of an electric machine with liquid cooling, containing a rotor shaft with holes inside and pipes for the flow of coolant, characterized in that the supply and discharge of the coolant is carried out through a closed autonomous system, while two axial eccentric holes pass inside the shaft, and one axial eccentric hole and radial holes for supplying coolant are located at one angle in a plane perpendicular to the axis of the electric machine, and the other axial eccentric hole and radial holes for withdrawing coolant are located at a different angle in a plane perpendicular to the axis of the electric machine, while supply and discharge of coolant carried out from the same end of the rotor shaft.

Description

The utility model relates to the field of electrical engineering, in particular, to electric machines of alternating and direct current with liquid cooling of the rotor.

Known explicit polar synchronous electric machine (copyright certificate SU 400249 A1, IPC: H02K 1/32, H02K 9/16, published 05.08.1976) [1], in which to increase the cooling efficiency in the cores of the rotor poles in the axial direction are installed tubes with circulating in them coolant.

The disadvantage of these systems is the high complexity of their manufacture due to the presence of a large number of parts and complex assembly. Also, the disadvantage is that if the cooling system is not evaporative, then the coolant is discharged as a gravity drain into drain tanks. This method of draining the liquid from the rotor of an electric machine is not applicable in closed autonomous cooling systems, for example, used in transport (automotive liquid cooling systems).

The closest analogue (prototype) is the liquid cooling system of the turbogenerator rotor, (copyright certificate SU 152907 A1, IPC: H02K 9/16, H02K 1/32, H02K 13/02, published 01.01.1963) [2], which includes , a turbogenerator rotor comprising a coolant passage pipe located in a central axial hole of the shaft, and connecting current buses isolated from the shaft, located between the winding and contact rings placed outside the thrust bearing. The connecting busbars are arranged concentrically with respect to the pipe, isolated from each other and from the metal casing protecting the connecting current busbars from liquid penetration and forming a channel for draining the cooling liquid with the outer surface of the pipe.

The disadvantage of this device is the difficulty in manufacturing, since it requires the manufacture of a large number of additional assembly units and parts (current conductors in the form of copper half rings, current conducting housings, o-rings, etc.), additional types of work (insulation of current conductors, sealing of the current conducting chamber, adjustment clamping o-rings, etc.). In addition, the coolant is drained through the channel formed between the metal casing protecting the connecting current busbars and the outer surface of the pipe. In this case, the coolant can be discharged through the annular channel only by gravity into a specialized drain tank. It is not possible to use such a rotor cooling device in electric machines with an autonomous closed cooling system.

The technical task of the utility model is to simplify the rotor liquid cooling device and to apply the proposed technical solution in electric machines using autonomous closed liquid cooling systems.

The technical result of the utility model is to reduce the complexity of its manufacture, which helps to increase the cooling rate and increase reliability.

The problem is solved due to the fact that the rotor of an electric liquid-cooled machine contains a rotor shaft with holes inside and pipes for the flow of coolant. The difference is that the supply and removal of coolant is carried out in a closed autonomous system. Two axial eccentric holes extend inside the rotor shaft. One axial eccentric hole and radial holes for supplying coolant are located at the same angle in a plane perpendicular to the axis of the electric machine. Another axial eccentric hole and radial holes for draining the coolant are located at a different angle in a plane perpendicular to the axis of the electric machine. Coolant is supplied and discharged from the same end of the rotor shaft.

The proposed technical solution is illustrated by the illustrations of figure 1, figure 2 and figure 3. Figure 1 shows the rotor of an electric machine with a liquid cooling system with a longitudinal section. Figure 2 shows a cross section of the rotor shaft - section aa. Figure 3 shows a cross section of the rotor shaft - section BB.

The rotor device of a liquid-cooled electric machine includes:

1 - rotor shaft;

2 - axial eccentric hole for supplying coolant;

2 '- axial eccentric hole for draining the coolant;

3 - magnetic system of the rotor;

4 - rotor winding;

5 - radial holes for supplying coolant;

5 '- radial holes for draining the coolant;

6 - input fittings;

6 '- output fittings;

7 - external inlet tubes for supplying coolant;

7 '- external output tubes for draining the coolant;

8 - inner tubes for coolant.

An axial eccentric hole for supplying coolant 2 in the shaft of the rotor 1 is connected to radial holes for supplying coolant 5, which are connected to inlet fittings 6. External inlet pipes for supplying coolant 7 are connected to internal tubes for coolant 8, which are connected to external outlet tubes for draining the coolant 7 '. The external coolant exhaust tubes 7 'through the outlet fittings 6' are connected to radial coolant vents 5 ', which are connected to an axial eccentric coolant vent 2'.

The device operates as follows:

The coolant is fed into the axial eccentric hole for supplying the coolant 2 (Fig. 1) and enters the radial holes 5, offset by an angle α in the plane perpendicular to the axis of the electric machine, section AA (Fig. 2) for supplying the coolant to the magnetic the rotor system 3, and then through the inlet fittings 6 and the external input tubes for supplying coolant 7 enters the inner tubes 8, cooling the magnetic system of the rotor 3 and the rotor winding 4. The cooling fluid from the magnet is heated by the heat of the rotor minutes rotor system 3 through the external output tube for coolant outlet 7 'and outlet fittings 6' enters the radial holes 5 'are offset by an angle in a plane perpendicular to the axis of the electric machine, section BB (Fig. 3) for draining the heated coolant from the rotor magnetic system 3. Then, through the axial eccentric hole 2 ', the coolant enters the heat exchanger (not shown), after which the cold returns into the axial eccentric hole for supplying coolant 2 for the next cooling cycle of the rotor of the electric machine.

The proposed technical solution makes it possible to use the rotor of an electric liquid-cooled machine in electric machines with an autonomous closed-circuit liquid cooling system, for example, in cars where gravity drainage of coolant into separate containers is excluded and leakage of coolant is eliminated, and coolant is supplied and discharged from the same end of the rotor shaft.

In the utility model, a simplification of the rotor cooling device of an electric machine has been achieved, which contributes to an increase in cooling intensity, increased reliability and environmental improvement, since the proposed technical solution ensures its use in electric machines with an autonomous closed-circuit liquid cooling system. Thus, the technical task is solved.

Sources of information taken into account when preparing the application:

[one]. Copyright certificate SU 400249 A1, IPC: H02K 1/32, H02K 9/16, published 05.08.1976.

[2]. Copyright certificate SU 152907 A1, IPC: H02K 9/16, H02K 1/32, H02K 13/02, published 01/01/1963.

Claims (1)

The rotor of an electric liquid-cooled machine, comprising a rotor shaft with holes inside and pipes for coolant flow, characterized in that the coolant is supplied and discharged in a closed autonomous system, with two axial eccentric holes passing inside the shaft, and one axial eccentric hole and radial holes for supplying coolant are located at one angle in a plane perpendicular to the axis of the electric machine, and another axial eccentric hole and Radial holes for draining the coolant are located at a different angle in the plane perpendicular to the axis of the electric machine, while the coolant is supplied and discharged from the same end of the rotor shaft.