RU14703U1 - VERTICAL ELECTRIC MOTOR WITH GAS-DYNAMIC ROTOR LEVITATION - Google Patents

Abstract

A vertical motor with gas-dynamic levitation of the rotor, containing a cylindrical rotor mounted on a shaft, the upper and lower trunnions of which are mounted in radial bearings, rigidly fixed in the end flanges of the external stator, on the inner surface of which a three-phase electric winding is laid, the lower trunnion of which is supported by a thrust mechanical bearing characterized in that a propeller is mounted on the upper journal of the rotor shaft.

Description

Vertical electric motor with gas dynamic

rotor levitation

The utility model relates to electric machines, and more particularly to the area of non-contact suspension of a rotor of an electric motor with a vertical axis of rotation.

Known electrical machines, using supports with gas lubrication for non-contact retention of the turning rotor. (Sliding bearings with gas lubrication. Edited by S.A.Sheinberg. M.: Mechanical Engineering, 1979). In such machines having a cylindrical stator with a three-phase electric winding laid in its grooves, the rotor mounted on the shaft, the upper and lower trunnions of which are radially supported by radial bearings, and whose lower trunnion rests on a thrust mechanical bearing, the levitation force is generated by gas, which is fed into the working gap under pressure, or by a moving gas stream excited by the levitated body itself.

The use of gas as a lubricating medium removes many of the limitations associated with temperature, high and low speeds, environmental pollution, etc.

The main disadvantage of such machines is the need for a compressor that provides gas injection into the working gap.

The noted drawback is deprived of a centrifugal supercharger with gas-dynamic thrust bearings with spiral grooves, (Gas lubrication of bearings. Collection of reports at a meeting on gas lubrication of bearings. M.: Institute of Mechanical Engineering.-1968,312s.) Selected as a prototype. The device has on the heel surfaces areas profiled by spiral grooves. These grooves are, as it were, built-in microcompressors that provide an increase in pressure in the bearing lubricant layer and allow the creation of a directed gas flow from one border of the bearing to the other.

The main disadvantage of the prototype is that the levitation ability of the thrust gas-dynamic bearing with spiral grooves due to the low viscosity of the gases decreases sharply with an increase in the gap between the heel and the thrust surfaces.

MIIK-F 16C13 / 10

The objective of this utility model is to increase the operational reliability of the electric motor.

This problem is achieved by the fact that a vertical motor with gas-dynamic levitation of the rotor containing a cylindrical rotor mounted on a shaft, the upper and lower trunnions of which are mounted in radial bearings, rigidly fixed in the end flanges of the external stator, on the inner surface of which a three-phase electric winding is laid, and the lower the trunnion which is supported by a thrust mechanical bearing has a propeller mounted on the upper trunnion of the rotor shaft.

Compared analysis with the prototype shows that the claimed device is different landing propeller on the upper journal of the rotor shaft. The marked difference allows to eliminate the need for minimality and accuracy of manufacture of the working clearance of the thrust bearing.

The drawing shows a General view of a vertical electric motor with gas-dynamic levitation of the rotor; 1-rotor;

2-propeller; 3-stator;

4,5 radial bearings; 6-thrust mechanical bearing; 7-stator windings.

The electric motor has a rotor 1 with a propeller 2 mounted on the upper trunnion. Radial bearings 4,5 are located on the stator 3. To compensate for the gravity of the rotor during start-ups and stops, the PCB of the thrust mechanical bearing 6 is used. The windings 7 create a rotating magnetic field of the motor.

The operation of the proposed device is as follows. After powering the windings 7 of the stator 3, the rotor 1 begins to rotate, leaning on the thrust bearing 6. In the radial direction, the rotor 1 is held using radial bearings 4.5. Together with the rotor 1, the air screw 2 also begins to rotate.

surrounding gas creates a traction force, where D-diameter

screw disk 2, p is the gas density, V is the velocity increment in the jet caused by screw 2. Since the propulsion force of the screw depends only on the parameters of screw 2, there is no need for the minimum and accuracy of manufacturing the working clearance of the thrust bearing 6.

The equality of the thrust of the screw 2 to the gravity of the rotor 1 is achieved by selecting the appropriate parameters of the VIP 2 (angle of attack of the blades, the number of blades, the shape and area of the blades).

Replacement of a gas thrust bearing with spiral grooves with a propeller is important in high power engines, since in order to obtain the required value of the levitation force of the rotor, a bearing with spiral grooves must be made with a small gap between the thrust and heel surfaces of 10-20 μm per side. In large-scale electrical engineering, this value is a technological tolerance. The manufacture of an electric motor with such a small clearance in the bearing presents certain difficulties and is possible only with a very high level of mechanical engineering.

Claims (1)

A vertical motor with gas-dynamic levitation of the rotor, containing a cylindrical rotor mounted on a shaft, the upper and lower trunnions of which are mounted in radial bearings, rigidly fixed in the end flanges of the external stator, on the inner surface of which a three-phase electric winding is laid, the lower trunnion of which is supported by a thrust mechanical bearing characterized in that a propeller is mounted on the upper journal of the rotor shaft.