SU1473018A1 - Electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to increase the cooling efficiency. In an electric machine, on the rotor 1 under the frontal parts 2 of the stator winding 3 there is a ventilation device consisting of an axial fan 4 having a conical hub 6 and a conical-cylindrical casing 7 covering the fan blades 5. The casing and the hub form an annular chamber 12 tapering towards the axial ventilation channels of the rotor 11, which eliminates pressure losses before entering the axial channels. 1 hp f-ly, 2 ill.

Description

CP 86 U P Fi. /

114

The invention relates to electrical engineering, in particular to electric machines with radial ventilation,

The purpose of the invention is to increase the cooling efficiency.

FIG. 1 shows an electric machine with axial channels in the rotor, placed by pores, with a magnetic wire, and a longitudinal section; in fig. 2 shows an embodiment of an electric machine using a shorting ring as the conical section of the air guide of the housing.

The electric machine has on the rotor 1 under the frontal part 2 of the stator winding 3 an axial fan 4, consisting of blades 5 and a conical chopper 6, and a cone-pilindrical casing 7, which covers the fan blades. The conical surfaces 8 and 9 of the fan hub and casing are adjacent to the entrance 1 O of the axial channels 11,

placed under the rotor magnetic core in such a way that between the exit from the fan and the inlet to the axi-channel channels, the annular chamber 12 converges in the direction of the discharge direction 12. The inlet 13 and outlet 10 of the annular chamber 12 coincide respectively with the outlet 13 of the axial fan and inlet 1 o axial channels. As the conical section 9 of the casing 7, the inner surface 14 of the short-circuiting colract 15 can be used, and as the conical section 8 of the hub 6, the surface 16 of the shaft 17 with the corresponding conical shape (Fig. 2). In this case, the end section of the conical surface 16 of the shaft at the interface of the output of the annular chamber — the entrance of the axial channels can be deepened with respect to the remaining sections of the shaft of the ventilation device (Fig. 2)

When the rotor rotates, the flow of the cooling agent, which is accelerated in the axial fan, is directed through the annular chamber 11 into the axial channels 1 1 of the rotor and from there - further along the ventilation path of the internal system of the electric machine again to the input of the axial fan (if the system is closed ) or into the surrounding space (if the system is

is closed). After this, the cycle is repeated again.

The presence of an annular chamber, organized by two conical surfaces, the hub of the fan and the guide casing, allows smooth coupling of the fan inlet to the axial channel inlet and thereby eliminating pressure losses associated with expansion - flow restriction. The variant with the inner conical surface deepened into the shaft (Fig. 2) has additional advantages in connection with the expansion of the bottleneck of the ventilation device; the exit of the annular chamber is the entrance to the axial channels and due to the decrease in the degree of constriction (confuser STI) annular chamber in the direction of injection. For the first reason, the aerodynamic resistance of the entrance from the chamber to the axial channels decreases, and according to the second, the static pressure in the axial channels increases.

Claims (1)

1. Electric machine with radial-consonant ventilation, containing a stator with a winding and frontal parts, a rotor with a shaft, magnetic core and axial channels in the magnetic core and located under the frontal parts, axial fans with blades, hub and casing in the form of a body of rotation, on one side enveloping the blades, and on the other side adjacent to the magnetic conductor and encompassing axial channels, characterized in that, in order to increase the cooling efficiency, the hub of the fan is made conical, with an inclination in the side y axial channel to form, together with the housing chamber .koltsevoy which interfaced inlet to the outlet of the axial fan, and an output - to the input of the axial to the & - catch,. 2, the machine according to claim 1, of tl and ch and-ya with the fact that ka the shaft section, which is a continuation. stu 3U73018 pizza, made ring ditch in the annular chamber injection with with a smooth profile in the place socialist house in the axial channels. 75 u