RU89785U1 - FAN-INDUCTOR MOTOR WITH FORCED AIR COOLING - Google Patents

Abstract

1. A valve-induction motor comprising a housing with an axially finned surface, a fan supplying cooling air to the housing end, and stator gear packages with phase windings located in the internal cavity of the housing, ring field windings and gear rotor packages mounted on a shaft mounted in the bearings of rotation, while in the stator gear bags axial channels of internal cooling are made, and the fin surface of the housing is at least partially covered by steel welded to the tops of the ribs sheets with the creation of channels of external cooling between the ribs. ! 2. The engine according to claim 1, in which the entrances to the external cooling channels are made from the internal cavity of its housing.

Description

Technical field

The proposal relates to a frequency-controlled electric drive and can be applied in the design and manufacture of induction motors with forced air cooling.

State of the art

Known are electric machines with forced air cooling, comprising a housing with an axially finned outer surface, a fan with an air duct supplying cooling air to the end face of the housing, and laden stator packages with phase windings and lined rotor packages mounted on the motor shaft [1-3] ]. Machine cooling [1-3] is characterized by the presence of axial air currents blowing over the burnt stator, rotor and finned housing surface packages.

A common drawback of the designs of electric machines [1-3] is the low efficiency of heat removal from the housing and the stator packets placed in it, which leads to an increase in temperature in the inner regions of the stator packets and a corresponding decrease in the reliability of the motor. This drawback in the design [1] is due to the absence of cooling channels inside the stator packets and in the housing, and in the designs [2, 3] - to use as the cooling channels hollow ribs formed on the surface of the housing from a corrugated metal sheet and therefore having poor thermal connection with case.

This drawback is especially pronounced in the case of using structural solutions [1-3] for cooling valve-induction motors, which is due to the increased frequency of supply of their phase windings from valve converters, which increases the loss in steel, as well as the fact that in such engines the main share of thermal losses is allocated in the stator part of the machine, where both phase windings and motor excitation windings are located.

Utility model creature disclosure

The objective of the utility model is to increase the efficiency of engine cooling.

The technical result achieved by using the utility model is an increase in the efficiency of heat removal from the heat-loaded elements of a valve-induction motor, a decrease in their operating temperature, and a corresponding increase in engine reliability.

The subject of a utility model is a valve-induction motor, comprising a housing with an axially finned surface, a fan supplying cooling air to the end of the housing, and gear packages of the stator with phase windings located in the internal cavity of the housing, ring field windings and gear packages of the rotor mounted on the shaft, installed in rotation bearings. Moreover, in the stator gear packages, axial channels of internal cooling are made, and the ribbed surface of the housing is at least partially covered by steel sheets welded to the tops of the ribs with the creation of external cooling channels between the ribs.

The above set of features allows you to get the above technical result.

The utility model has a development aimed at simplifying the design in the particular case of its implementation. The development consists in the fact that the entrances to the external cooling channels are made from the internal cavity of the engine casing.

Implementation of a utility model, taking into account its development

Figure 1 and figure 2 shows an example implementation of the proposed valve-induction motor. In Fig. 1, a general view of the motor is shown; in Fig. 2 is a cross section of the motor casing with the stator packages installed therein (conventionally without windings).

The engine in figure 1 and figure 2 contains a housing 1 (in the form of a cut hollow cylinder), on the surface of which are made in the axial direction of the heat-removing ribs 2, and a stand-alone fan 3, supplying air to the end of the housing 1 through the guide duct 4. In the inner cavity the housing 1 is fixed two pairs of gear packages 5 of the stator with phase windings 6 and two ring windings 7 excitation, one for each pair of packages 5.

Two pairs of gear packages 8 of the rotor are mounted on a shaft 9 mounted in the bearings 10 of rotation using a sleeve 11 of magnetically soft material that provides magnetic coupling between the packages 8 of the rotor.

Stator packs 5 and rotor packs 8 are lined from sheets of electrical steel. The number of teeth of the stator and rotor packages is different.

In the axial direction of the stator packs 5, internal cooling channels 12 are made so that under each groove of the stator pack 5 there is a pair of channels 12. The fin surface of the housing 1 is partially covered by steel sheets 13 welded to the tops of the ribs 2 to create external cooling channels 14 between the ribs 2.

A fan 3 with an air duct 4, internal cooling channels 12 and external cooling channels 14 form a forced cooling system of the engine. The fan 3 can, as in the presented example, have an autonomous drive and supply cooling air to the engine end via the duct 4 or have a kinematic connection with the motor shaft 9 (for example, the fan 3 can be mounted directly on the shaft 9). In the latter case, the inputs 15 into the channels 14 of the external cooling can be made from the internal cavity of the housing 1.

The device operates as follows.

Corresponding supply voltages are supplied to the field windings 7 and phase windings 6, as well as to the motor of the autonomous fan 3 from external sources. The magnetic flux generated by the phase windings 6 and the excitation windings 7, are closed through the packages 8 of the rotor. The principle of the motor is based on the magnetic attraction of the tooth of the rotor package to the nearest tooth of the stator package. The corresponding currents in the phase windings 6, set by the power supply converting valve converters, and the inequality of the teeth in the packages 5 of the stator and packages 8 of the rotor provide smooth rotation of the shaft 9 with an adjustable frequency and the required torque.

In this case, the engine is cooled as follows.

A rotating fan 3 drives atmospheric air through a guide duct 4 into the end of the housing 1, where the cooling air is divided into:

- the first stream passing along the outer surface of the housing 1 through the channels 14 of external cooling formed by sheets 13 welded to the tops of the ribs 2;

- a second stream passing through the internal cooling channels 12 through the stator packets 5;

- the third stream passing through the interdental grooves of the stator packets 5 and the rotor packets 8 and the gaps between the stator packets 5 and the rotor packets 8.

The first stream removes heat from the ribs 2 of the housing 1, which has good thermal contact with the stator packets 5, intensively heated by phase windings 6, field windings 7 and eddy currents in steel. In this case, the sheets 13 do not replace the heat-removing ribs of the casing (in contrast to the corrugated sheets in [2, 3]), but serve only to form a cooling air flow along the surface of the ribs 2 of the casing 1. In those cases when the inlets 15 into the channels 14 are made of the inner cavity of the housing 1, the first stream is formed from the air pumped by the fan 3 into the end of the housing 1, in the form of air jets entering the channels 14 from the inner cavity of the housing 1 through the inlets 15.

The second stream takes heat from the inner regions of the stator packs 5, from the phase windings 6 and the field windings 7, and the third from the tooth surfaces of the stator packs 5 and rotor packs 8.

Since the bulk of the heat loss of the valve-induction motor is allocated in its stator, the first and second flows formed in the channels 12 and 14, respectively, play the main role in cooling the engine.

The execution of a valve-induction motor in a housing with an axially finned surface, at least partially covered by steel sheets welded to the tops of the ribs, forming external cooling channels, and with axial internal cooling channels made in stator stacked bundles, provides in combination with other essential features utility model, a decrease in the operating temperature of the heat-loaded elements of the valve-induction motor and a corresponding increase in engine reliability.

The implementation of the external cooling channels 14 with the inputs 15 made of the internal cavity of the casing allows preserving the cooling efficiency in particular cases when the utility model is implemented, for example, using the built-in fan. Information sources

1. Patent RU 217318, IPC Н02К 9/04, 2001

2. Patent RU 2089033, IPC Н02К 9/04, 1997

3. Auth. testimonial. SU 1179483, IPC Н02К 9/02, 1985

Claims (2)

1. A valve-induction motor comprising a housing with an axially finned surface, a fan supplying cooling air to the housing end, and stator gear packages with phase windings located in the internal cavity of the housing, ring field windings and gear rotor packages mounted on a shaft mounted in the bearings of rotation, while in the stator gear bags axial channels of internal cooling are made, and the fin surface of the housing is at least partially covered by steel welded to the tops of the ribs sheets with the creation of channels of external cooling between the ribs. 2. The engine according to claim 1, in which the entrances to the external cooling channels are made from the internal cavity of its housing.