RU2494519C2 - Synchronous generator - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: in a synchronous generator, comprising stator, front and rear covers, a rotor with beaked pole tips and an excitation coil, according to this invention, the rotor is additionally equipped with a star-like non-magnetic link with a central hole. The latter is installed in the middle of the coil in the plane of its rotation, and link teeth are arranged between beaked tips. Using this invention makes it possible to efficiently use ventilation action of pole tips, at the same time each of tip sets cools the appropriate front part of the stator. At the same time, if separate fans are used, the number of vanes in their blades may be excluded or anyway reduced, and the vane width may be decreased. These effects are achieved by using a technologically simple part of a star-like non-magnetic link, which may be made, for instance, by means of casting from plastic.

EFFECT: improved operational characteristics due to reduced consumed power spent for ventilation and improvement of thermal characteristics.

2 dwg

Description

The invention relates to electric machines, namely to synchronous generators of inductor type, used, for example, in automotive electrical equipment.

Known synchronous generator containing a shaft, covers with bearings. A rotor in the form of an asterisk is installed on the shaft, having magnetic contact with the stator, in addition, a coil with a winding with a magnetic circuit in magnetic connection with a second magnetic circuit mounted on the rotor and having magnetic contact with the asterisk is installed on one of the covers (one-way excitation). A similar coil can be mounted on the second cover (two-way excitation). Constructive varieties of this generator are described in [1].

The disadvantages of this synchronous generator are the large masses and dimensions, as well as the fact that the frontal parts of the stator winding lying behind the stator along the cooling air are cooled by the air already lying in front of the stator, lying in front of the stator.

The closest to the claimed invention in technical essence and the achieved results is a non-contact synchronous generator [2], containing a front and rear cover with holes, a stator in the form of a package with a working winding, a rotor with an excitation source and claw-shaped tips, built into the rectifier, the rotor hollow shaft with radial holes.

The disadvantage of this device is the large turbulence excited by the beak-shaped tips of the rotor, which leads to a decrease in the heat transfer intensity, a violation of the synchronism in the stator blower, which ultimately leads to ventilation losses.

The invention is aimed at improving operational characteristics by reducing the power consumption spent on ventilation and improving thermal characteristics.

This is achieved by the fact that in a synchronous generator containing a stator, front and rear covers, a rotor with beak-shaped pole pieces and an excitation coil, according to the invention, the rotor is further provided with a star-shaped non-magnetic jumper installed in the middle of the coil in the plane of its rotation, and the jumper teeth are located between the beak-shaped tips.

Figure 1 shows a General view in section of the synchronous generator, figure 2 shows the proposed star-shaped non-magnetic jumper in plan.

This synchronous generator contains a bearing 1 on the rectifier side, a brush holder 2, a stator 3, a bearing 4 on the drive side, a pulley 5, fans 6, a front cover 7, beak-shaped rotor tips 8, a back cover 9, a rectifier 10, an asterisk-shaped jumper 11. Jumper 11 contains teeth 12, is worn on a coil 13 with a core 14 (sleeve), which, in turn, is worn on the splines of the shaft 15. As can be seen from figure 1, a non-magnetic jumper is installed in the middle of the coil 13 in its axial direction, has a central hole coil placed In this case, the teeth 12 of the jumper are located between the beak-shaped tips 8.

The device operates as follows. When the pulley 5 rotates and the coil 13 is turned on, the stator teeth cross the magnetic field of the beak-shaped tips 8, inducing a current in the working winding, which is then supplied to the load through the rectifier. The generator is cooled by standard fans 6, cool the frontal parts of the working winding. In parallel with them work and pole pieces, acting as blades.

A star-shaped non-magnetic jumper prevents the flow of turbulent air flows caused by the identity of the right and left pole tips of the rotor, contributes to the creation of aerodynamic drag for these turbulent flows, which can break through only a relatively small gap between the jumper and the stator. Thus, the beneficial effect of the pole pieces acting as blades is enhanced and added to the action of the fans.

Using this design allows you to:

- effectively use the ventilation action of the pole pieces, with each of the sets of tips cools the corresponding frontal part of the stator;

- as a result of the use of individual fans, the number of blades can be eliminated or, in any case, the width of the blades can be reduced;

Information sources

1. RF patent No. 2231199 - Non-contact synchronous generator / A.M. Litvinenko, application No. 2003109938, publ. 04/07/2003, bull. No. 17, IPC 7 H02K 19/06.

2. RF patent №2335079 - Synchronous generator / A. M. Litvinenko, I. N. Brain, application No. 2007136433/09 publ. 09/27/2008, bull. No. 27, IPC H02K 19/36.

Claims (1)

A synchronous generator containing a stator, front and rear covers, a rotor with beak-shaped pole pieces and an excitation coil, characterized in that the rotor is additionally equipped with a star-shaped non-magnetic jumper installed in the middle of the coil in the plane of its rotation, and the jumper teeth are located between the beak-shaped tips.

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