RU203537U1 - ASYNCHRONOUS TRACTION MOTOR - Google Patents

Abstract

The utility model relates to electrical engineering objects and, in particular, to electrical machines - asynchronous motors. An asynchronous traction motor with a rotor winding made of short-circuited single-turn copper tape coils contains a stator with a winding, a rotor with a winding, a rotor shaft with landing cones for installing small gear wheels, end shields with bearings, terminal box for connecting phases, fasteners to the bogie frame and attachments to axial support bearings. The rotor core is assembled from electrical steel sheets, shrink-fitted on the rotor shaft sleeve and pulled together by rotor pressure plates, and the sleeve is made with internal cavities with partitions. A temperature sensor is installed in the stator tooth in the bore of the thrust washer. Each end shield has channels for supplying and removing grease, and in the right end shield there is a shaft rotation speed sensor, the rotor of which is mounted on the shaft. The technical result is improved maintainability, reduced material consumption. The open-frame design provides compactness and weight reduction, and, consequently, a high power density. It also provides easy access for service and repair. 4 ill.

Description

The utility model relates to the field of electrical engineering and, in particular, to electrical machines - asynchronous motors.

An asynchronous traction motor is known from the prior art, which contains a housing, a stator, and a rotor. The rotor has an aluminum alloy hub installed between the rotor shaft and the package, which has at least eight cooling axial channels with a circular cross-section and at least eight channels of a triangular shape. The stator is installed in the housing using the technology of thermal transfer press fit (patent RU 184734 "Asynchronous traction motor", IPC H02K 17/16, publ. 07.08.2018). The disadvantages of this induction motor are also the massive structure due to the presence of the product body, the high labor intensity of maintenance due to the lack of the possibility of replenishing the lubricant in the bearings without partial disassembly of the motor, insufficient reliability of the bearing seal under the influence of external influencing and operational factors (sharp temperature drops 60 ° C , bearing life 2 million km) due to the use of elastic cuffs, the absence of the second output end of the shaft.

The technical task of the technical solution of an asynchronous traction engine proposed for legal protection is to ensure a high indicator of the specific power of the engine.

The technical result is aimed at improving maintainability and reducing material consumption, compactness, and, accordingly, reducing the weight of the engine.

The technical result is achieved by the fact that an asynchronous traction motor with a rotor winding made of short-circuited single-turn coils made of copper tape contains a stator with a winding, a rotor with a winding, a rotor shaft with landing cones for installing small gear wheels, end shields with bearings, a terminal box for connecting phases, attachment elements to the bogie frame and attachment points to axial support bearings. In this case, the rotor core is assembled from electrical steel sheets, installed by shrink-fitting on the rotor shaft sleeve and pulled together by rotor pressure plates, and the sleeve is made with internal cavities with partitions preventing the circulation of cooling air through the sleeve.

A temperature sensor is installed in the stator tooth in the bore of the thrust washer.

Each end shield is provided with a grease supply channel. In this case, the shaft rotation speed sensor is located in the right end shield, the rotor of which is mounted on the shaft.

The open-frame design of the stator core provides a compact and lightweight motor, and, consequently, a high power density

In order to reduce the total mass of the rotor, the shaft sleeve is made of aluminum and has internal cavities with baffles that prevent the circulation of cooling air through the sleeve. In addition, the presence of a sleeve on the rotor shaft provides a reduction in the material consumption of the rotor, obtained due to the presence of holes in the sleeve, and the maintainability of the rotor, achieved by the possibility of extrusion of the shaft from the sleeve without losing the integrity of the rotor package.

The presence in the bearing shields of built-in channels for the supply and discharge of grease ensure easy grease change during operation without removing the engine and disassembling the bearing unit, which improves the maintainability of the engine.

The design of the asynchronous traction motor and the essence of the claimed utility model is illustrated by the following graphic materials: FIG. 1 is a longitudinal section of an asynchronous traction motor, FIG. 2 - view A in FIG. 1, fig. 3 - view b-b in fig. 1, fig. 4 is a front view of an induction traction motor.

The positions in FIG. 1 to FIG. 4 the following elements are indicated: 1 - stator core; 2 - stator winding; 3 - shaft; 4 - right (first) bearing shield; 5 - left (second) bearing shield; 6 - terminal box; 7 - air duct protection device; 8 - rotor core; 9 - sleeve; 10 - loop winding of the rotor; 11 - mesh; 12 - bearing; 13 - lubricant supply channel; 14 - rotor of the shaft rotation speed sensor; 15 - base for fastening to the motor-axle suspension, 16 - rotor pressure plates, stator pressure washer 17, 18 - temperature sensor, 19 - grease drainage channel; 20 - hole for draining condensate from the engine, 21 - grounding ring.

The proposed asynchronous traction motor with a rotor winding 10 made of short-circuited single-turn coils made of copper tape (Fig. 1) contains a stator (stator core 1 and stator winding 2). The stator core 1 has a frameless design. The stator sheets are pulled together under the press by clamping rings on both sides using tear-resistant plates, forming a rigid structure due to the frame, which provides compactness and weight reduction, and, consequently, a high power density. On the rupture-resistant plate of the stator core, a terminal box 6 is installed on top for connecting the phases, fastening elements to the bogie frame 15 and attachment points to axial support bearings (not conventionally indicated in Fig. 1).

In this case, the rotor core 8 is assembled from electrical steel sheets, installed by shrink-fitting on the bushing 9 of the rotor shaft 3 and pulled together by the pressure plates of the rotor 16. The bushing 9 is made with internal cavities with partitions preventing the circulation of cooling air through the bushing. The rotor shaft 3 is made with landing cones for the installation of small gear wheels.

On the shaft 3, end shields are installed (right / first 4 and left / second 5) with bearings 12. Each end shield 4 and 5 has channels for supplying grease 13 and removing grease 19 (Fig. 2, Fig. 4). In this case, a shaft rotation speed sensor is located in the right end shield 4, the rotor 14 of which is mounted on shaft 3 (Fig. 2). In the cylindrical part, on top of the end shields 4 and 5, duct channels are made, closed by protection devices 11 and 7, respectively.

To ensure constant monitoring of the temperature of the stator winding 2 at the point with the maximum calculated heating temperature in the hole of the stator pressure washer 17, a temperature sensor 18 is installed (Fig. 3).

To prevent damage to gears from parasitic currents flowing through the shaft of the induction motor, grounding rings 21 are installed on the bearing shields (Fig. 4).

The technical solutions used in the presented traction motor make it possible to reduce the maintenance costs of the main product (there is no need to disassemble the product to replenish the lubricant in the bearings), increase the reliability of the traction drive due to the use of shaft grounding rings (parasitic currents do not affect the reliability and service life of gears in as part of the drive).

The prototype of the asynchronous traction motor has been tested to meet the requirements of the technical assignment ATD01.00.000.000 TZ, which confirms the performance of the electric motor, made using these technical solutions proposed for legal protection.

Claims (1)

Asynchronous traction motor with a rotor winding made of short-circuited single-turn coils made of copper tape, containing a stator with a winding, a rotor with a winding, a rotor shaft with landing cones for installing small gear wheels, end shields with bearings, a terminal box for connecting phases, fasteners to the bogie frame and attachment points to support-axial bearings, characterized in that the rotor core is assembled from sheets of electrical steel, installed by shrink fit on the rotor shaft sleeve and pulled together by rotor pressure plates, and the bushing is made with internal cavities with partitions, in the stator tooth in the pressure hole washers, a temperature sensor is installed, while in each bearing shield there are channels for the supply and removal of lubricant, and in the right end shield there is a shaft rotation speed sensor, the rotor of which is mounted on the shaft.

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