SU118885A1 - Device for liquid cooling of the rotor in a polar-pole synchronous machine - Google Patents

Description

This invention relates to devices for liquid cooling of a rotor of an ARMORPOLUS electric machine with a rotating pole system.

The proposed device differs from the known devices of this kind in that its pole system is placed in a liquid-impermeable casing, which provides for the formation of channels between the pole coils for the circulation of the cooling fluid.

This casing consists of the following elements:

a) boxes of magnetic material surrounding the poles and welded to a cylindrical bottom of magnetic material attached to the rim of the rotor;

b) a sheet of non-magnetic material bent in the form of a cylinder, which surrounds the pole coils in outer diameter and at the same time forms a damping system;

c) side metal walls connecting the bottom and the cylinder.

FIG. 1 and 2 depict the proposed device in two projections; in fig. 3-scheme of coolant supply in maschinakh with a relatively small rim diameter.

The rotor is cooled by an insulating fluid through a special cylindrical casing in which the coils of the rotor are placed.

To the rim 1 (Fig. 1 and 2) of the rotor, assembled from sheet steel, there is attached a cylindrical bottom 2 of the casing of magnetic material with boxes 3 of magnetic material welded to it. Inside the boxes 5, poles 4 with pole pieces are placed, and on the outside, pole coils 5 are put on, through which the excitation current flows.

The boxes 3 are in contact with the outer cylindrical sheet b of a non-magnetic material with high electrical resistance, No. 118885

duralumin example. This sheet, in addition to its basic function — form a liquid-impermeable casing around the pole system — simultaneously serves as a damper circuit, mainly along the longitudinal axis.

To reinforce the damper system along the transverse axis, the outer cylindrical sheet 6 can be curved so that it covers the surface of the pole piece sufficient to accommodate hollow damper rods cooled by the fluid flowing through them.

The side walls 7 of the casing connect the bottom 2 and the cylindrical sheet and together with them form liquid-tight seals. The supply of fluid to the casing and its removal from the casing is carried out in hydrogenerators through pipelines 8 located on the spokes 9.

When the rim and pole pieces are made massive from one piece of metal, the device of the liquid-impermeable casing can be simplified by eliminating the bottom 2 and the boxes 3.

In order to reduce the coolant flow rate, it is passed in series through several channels between the pole coils in the form of a series of parallel jets. For this purpose, partitions 10 of insulating material that are in direct contact with the copper of the coils are installed in the casing. If it is necessary to intake and discharge of fluid on opposite sides of the rotor hub, the number of channels successively passed by the fluid is odd. The fluid is injected into the rotor through the annular chamber 11, and the outlet through the annular chamber 12. In synchronous machines with a relatively small rim diameter, the fluid is introduced into the casing directly from the annular chamber 13 connected to the fixed part by means of a seal 14 (Fig. 3) . The discharge of fluid is carried out in a similar manner.

If the circumferential speed over the outer diameter of the rim is sufficiently large, an axial pump wheel 15 can be built into the side wall 7 of the casing to circulate the coolant in the machine.

In order to simplify the manufacturing technology of the machine and increase the reliability of its operation, the requirement of complete tightness of all seals is eliminated and leakage of fluid through the seals between the rotating and stationary parts of the machine and through leakages that may occur in the rotor or in the stator system is allowed. The leaking fluid through these leaks accumulates in the lower part of the machine and is pumped through the main closed path of the coolant through a specially arranged pump mounted on the machine shaft or driven by a special motor.

Subject invention

1. A device for liquid-cooling the rotor of a pole-synchronous masquerade with a rotating pole system, characterized in that for forming between the pole rollers channels for the circulating fluid, the pole system is placed in a liquid-tight casing consisting of:

a) surrounding poles of boxes of magnetic material, welded to a cylindrical bottom of magnetic material attached to the rim of the rotor;