SU1387107A1 - Oil-cooled asynchronous motor - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve cooling. The oil-cooled induction motor contains a stator 3 with a winding and a rotor 4 with a short-circuited winding. An upwardly open element 7 is rigidly attached to the upper ring of the rotor winding. Due to the fact that element 7 has radially located notches 8 of sinusoidal shape, this goal is achieved. 1 il.

Description

(L

with:

00 00

The invention relates to the design of oil-cooled asynchronous motors used, for example, in hermetic refrigeration compressors for the production of cold in domestic and commercial refrigeration equipment.

Asynchronous motors are known: used in hermetic refrigeration compressors, the rotor of which has inclined surfaces of different heights on the upper short-circuited ring, which ensure oil distribution throughout the winding head and on the casing (GDR patent No. 138258, cl. H 02 K 9/19 1980) .

However, such engines do not provide an even distribution of oil throughout the entire upper winding head. Oil spraying is provided in two planes, while the oil drops of the bottom plane are thrown into the winding head and, on the contrary, oil drops of the upper plane through the gap between the winding head and the engine body are thrown onto the inner wall of the casing and cooled there. As a result of splashing oil in the plane of the winding head, in the middle of the winding head, an unacceptable temperature difference is created inside the latter. It is further preferred to feed the oil from the winding head in the form of a closed oil film, and not in the form of drops to the upper winding head or through the gap between the winding head and the motor housing to the inner wall of the sealed casing.

The purpose of the invention is to improve cooling.

The goal is to continuously feed the Oil flow needed to cool the induction motor to the upper winding head around the entire perimeter and throughout its height and,. in addition, supplying the flow of oil necessary for cooling to the casing wall through an annular gap between the upper winding head and the motor housing. In this case, both mass flow should be submitted in the form of a continuous film.

In an oil-cooled asynchronous motor, in particular for hermetic refrigeration compressors, the rotor has a squirrel cage consisting of an upper and lower short-circuit

rings. On the top short-circuited ring there is a cylindrical or conical form open up rigidly connected to it. In this element there are radially located cuts of a sinusoidal shape for a constant distribution of the mass flow of oil around the entire perimeter and over the entire height of the upper winding head.

In the cylindrical or conical main body, there are one or, preferably, two sinus-shaped notches. The curvature of the sine function at the inflection point should satisfy the following condition;

tg ,, 5 | -t,

where h is the height of the notch or winding head j

n is the number of vices} d is the average diameter of a cylindrical or conical element. These cuts provide continuous oil wetting of the upper winding head along the entire height and the entire perimeter, and an oil film is clearly formed. This significantly reduces the winding temperature and the temperature difference inside the winding head.

The drawing shows an oil cooled asynchronous engine with a rotor in a hermetic refrigeration compressor,

The asynchronous motor 1 in a hermetically sealed refrigeration compressor 2 consists of a stator 3 and a rotor 4. The oil drawn from the oil pan of the casing through the shaft 5 is supplied both to the movable elements for lubrication and through the holes 6 in the shaft 5, to the conical element 7, which is connected with the rotor. From there, the oil is fed through, preferably, two sinusoidal shapes 8 to the upper winding head THAT and through the upper edge of the cone element 7 through an annular gap 9 between the upper winding head 10 and the motor housing 11 to the casing 12, Cutouts 8, corresponding to the sinus function, provide oil film, intensively cooling the entire upper winding head,

31387107

Claims (1)

Claims of the invention having a surface of rotation with a straight line forming, distinguished by an Oil-cooled asynchronous engine and with the fact that in order to improve The cage, mainly for hermetic cooling, the element has a radially refrigeration compressors consisting of sinusoidal chip from stator with winding and rotor, forms for permanent distribution having a winding with short-circuited oil flow around the perimeter and along rings, with the upper one being the hard height of the upper winding head the open up element is connected, the adjustor and to the casing.