CS238310B1 - AC generator in cascade configuration - Google Patents

Abstract

The alternating current generator in a cascade arrangement has an external rotor, the yoke of which with the excitation poles is connected to the supporting part of the fan and the stator is firmly connected to the bearing shield. This reduces the built-in dimensions of the generator, especially its length, reduces weight and saves material. It can be used in particular as an alternator exciter.

Description

(54)

DANIEL JlRI ing., NEDVEDICE, NEVER LEAVE TOMAS ing., BRNO

Brushless generator in cascade

The AC generator in cascade configuration has an external rotor whose yoke with excitation poles is connected to the fan support part and the stator is fixedly connected to the bearing shield. This results in a reduction in the built-in dimensions of the generator, in particular its length, weight reduction and material savings. It can be used especially as alternator drivers.

2? G 3JU ‘1238 310

The invention relates to an AC generator in a cascade configuration, in particular to an alternator driver.

In existing multi-stage rotary electrical machines, the individual cascade forming machines, such as the auxiliary excitation generator, the excitation generator with the rotating rectifier, and the main generator, typically cell side by side in a common frame with rotors on the common shaft. Generator or electric machines with self-ventilated ventilation in the fan housing. In the cascade arrangement of higher power rotary machines, the permanent magnet auxiliary generator on the external rotor is located within the excitation generator such that the external rotor of the auxiliary excitation generator is incorporated into the rotor yoke of the excitation generator. However, even this arrangement cannot be used in equipment where small built-in dimensions and weight are required, especially for traction or aeronautical applications.

The above-mentioned drawbacks are eliminated in the device according to the invention, which consists in that the yoke of the rotor of the generator _K with excitation poles is connected with the support part of the fan and the stator of the generator is firmly connected with the bearing shield.

In particular, the solution of the AC generator according to the invention achieves a reduction in its built-in dimensions, a reduction in weight and material savings.

The attached drawing shows an exemplary embodiment of the device according to the invention in longitudinal section.

The auxiliary excitation generator shown in the figure has a stator 1 with a working winding 2 pressed on the bearing shield hub 3.

Outside the stator 1 is arranged a rotor 4, whose yoke 5 of annular shape with excitation poles 6 formed by permanent magnets on its inner circumference are embedded in the support part 7 of the fan 8, which

2 238 310 is a magnetically non-conductive material. In the support part 7 of the fan 8, ventilation openings 9 are arranged in two different longitudinal planes, wherein the openings on a larger diameter form an angle with the longitudinal axis of the fan. Balancing rings 2θ are formed on the right side of the support part 7 of the fan 8 at its outer circumference.

In particular, the arrangement of the device according to the invention shortens the length of the machine. The ventilation openings in the fan support part improve the cooling of the stator winding faces, preferably using the self-venting effect of the openings forming an angle with its longitudinal axis. The fan may be axial or radial.

Claims (10)

P S B D X í ví ví ví An alternating current generator in a cascade configuration, in particular an alternator exciter arranged in common with the main exciter and the alternator, consisting of a stator with a winding surrounded by a fan mounted on an external rotor, whose yoke of annular shape has permanent magnet excitation poles of alternating polarity. wherein the blades are coupled to the fan support and the fan is positioned at the bearing shield and rigidly coupled to the shaft, characterized in that the yoke (5) of the excitation pole generator rotor (4) is connected to the fan support (7) (8) and the generator stator (1) is firmly connected to the bearing shield (3). 2. The alternating current generator according to claim 1, characterized in that the support part (7) of the fan (8) is provided with ventilation openings (9) connecting the space in front and behind the fan (8) in the axial direction. 3. An alternating current generator according to claim 1, characterized in that the ventilation openings (9) are arranged in different longitudinal planes. 4. An alternating current generator according to claim 1, characterized in that the ventilation openings (9) are arranged at an angle to the longitudinal axis of the fan (8). An alternating current generator according to claim 1, characterized in that balancing rings (10) are provided on the support part (7) of the fan (8). An alternating current generator according to claim 1, characterized in that the balancing rings (10) are formed by the yoke (5) of the rotor (4). An alternating current generator according to claim 1, characterized in that the yoke (5) with the poles (6) is embedded / pressed into the support part (7) of the fan (8), the material at least in the vicinity of the excitation poles (6) being non-magnetic. An alternating current generator according to claim 1, characterized in that the fan (8) is a non-magnetic casting / molding. An alternating current generator according to claim 1, characterized in that the fan (8) is made of an aluminum alloy. 238 310 An alternating current generator according to claim 1, characterized in that the fan (8) is made of thermosetting plastic.