JPH09103038A - Electrical equipment - Google Patents

Abstract

(57) Abstract: An electrical device, for example, a three-phase generator, is configured to have a winding protected against wear, and at the same time generate less noise. The above problem is solved by impregnating a winding end portion of a winding so that an unimpregnated region remains between a stator core and an impregnated portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device, for example, a three-phase generator, according to the general concept of claim 1.

[0002]

2. Description of the Related Art It is known that an electric machine constructed as a three-phase generator has a rotor and a stator, which rotor is formed of a claw pole rotor. This stator has a stator core that surrounds the claw pole rotor. Windings are arranged on the stator core, for example, in a meandering shape. In this case, the winding is fitted in the slot of the stator core and has at its periphery winding ends that project axially from the stator core. It is known to impregnate the enameled winding wire forming the winding in order to prevent it from being worn out by shock and vibration within the specified service life of the electrical equipment. is there. This impregnation is carried out, for example, by completely immersing the winding in the impregnating synthetic resin. After the impregnating synthetic resin has hardened, a compact winding body is formed. Furthermore, it is known to tape the windings instead of dipping and impregnating them in an impregnation bath. But,
During operation, neither electrical equipment with impregnated windings nor electrical equipment with taped windings is more active than electrical equipment with unimpregnated and untaped windings, i.e. in the stator core. However, it has been found that a larger noise is generated from an electric device having a winding that is fitted without being applied. However, the following disadvantages will occur even if the windings that have been inlaid do nothing. That is, for example, there is a risk of wear on the winding wires that intersect with each other, with the consequent risk of winding shorts.

[0003]

SUMMARY OF THE INVENTION It is an object of the invention to design an electrical device, for example a three-phase generator, to have windings that are protected against wear and at the same time be less noisy.

[0004]

The above-mentioned problems can be solved by the constitution described in the characterizing part of claim 1.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The electric equipment having the structure described in the characterizing portion of claim 1 of the present invention has the following advantages over the prior art. That is, the electrical device of the invention has the advantage that it has windings that are protected against wear and, at the same time, it is less noisy. By impregnating the winding ends of the winding so as to leave an unimpregnated region between the stator core and the impregnated portion, advantageously the following is possible. That is, for example, to protect the dangerous area at the winding end from wear and to separate the winding end from the stator core by the unimpregnated region, which results in resonance of the whole stator and its associated vibration. It is possible to reduce noise generation. Overall, the electrical equipment provided with the impregnated part according to the invention has advantageous damping properties against vibrations which occur during driving. In this case, slot impregnation of the winding strands is also usually omitted.

In another embodiment of the present invention, it may be constructed as follows. That is,
In addition to impregnating only the winding ends, the winding strands extending into the slots of the stator core can be configured to be wrapped by pre-impregnated paper as slot insulation. This pre-impregnated paper releases the impregnating synthetic resin when the electrical equipment is heated sufficiently. This improves the heat transfer from the winding wire to the stator core, for example the outer winding wire wrapped in slot insulation is very likely to dissipate heat to the stator core through this paper. Become. The release of heat from the stator core is performed by using, for example, a ventilation device as is known. This additional measure ensures that: That is,
Electric equipment operating in a temperature-hazardous area can also be provided with impregnated portions of the winding ends according to the invention, in which case a sufficiently high temperature heat between the winding strands and the stator core Conduction is guaranteed. Even in this case, the damping or vibration characteristics of this electric machine can be sufficiently ensured by the unimpregnated region between the stator core and the winding ends.

Other advantageous embodiments of the invention result from the dependent claims.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings.

A three-phase generator 10 is schematically shown in FIG. Only the parts substantially relevant to the invention are shown here and the detailed drawings have been omitted for the sake of clarity. Three-phase generator 1
The 0 has a claw pole rotor 14 arranged non-rotating on the rotor shaft 12 (shown in phantom). The claw pole rotor 14 includes a claw pole 18 extending from a first pole wheel 16 and a claw pole 22 extending from a second pole wheel 20.
have. The claw poles 18 and 22 are in this case formed like fingers in a known manner and are arranged alternately around the claw pole rotor 14. The three-phase generator 10 further comprises a stator 24, which is formed by a stator core 26 connected to a casing not shown here. In this case, the stator iron core 26 has the claw pole rotor 14 and the rotor shaft 1
It is coaxially surrounded by 2. The stator core 26 carries a winding 28, which is shown schematically here. This winding 28 is used for the stator core 2 not shown here.
It is arranged in six slots. This winding 28 is in this case arranged in a meandering fashion around the stator core 26, so that there is a winding end 30 projecting axially from the stator core 26. Since the three-phase generator 10 has three separate windings as a whole, the winding end portions 30 of the individual windings 28 are connected to the stator core 26.
It will protrude around and will intersect multiple times. To clarify this, in this schematic the two windings 28
Are illustrated by their winding ends 30.

The winding ends 30 have impregnated regions 32, as shown by the hatching in FIG. In this case, the impregnated portion 32 includes the stator core 26 and the impregnated portion 32.
Are arranged so that the unimpregnated region 34 remains between them. This means that the winding 28 has no impregnated portion in the slots of the stator core 26 and in the unimpregnated region 34, the impregnated portion being limited only to the winding ends 30. The unimpregnated region 34 has a length l. The impregnated portion 32 of the winding end portion 30 is formed, for example, by immersing the stator core 26 to which the winding wire 28 is completely attached in an impregnating bath of synthetic resin for impregnation. In this case, the winding end portion 30 is dipped at the dipping depth t. This immersion depth t is equal to the unimpregnated region 3
4 is chosen to remain for length l. This length l is
In this case, it is at least 1 mm. When the impregnating synthetic resin is completely hardened, the winding ends 30 of the winding 28 are fixedly connected to each other. As a result, the individual winding wires of winding 28 cannot move relative to each other when the three-phase generator is used as intended. This prevents the occurrence of wear of, for example, the winding wires of the winding 28 which cross each other. Through the unimpregnated region 34, the winding end 30 is vibrationally decoupled from the stator core 26. This can prevent the transmission of vibration, for example, the generation of resonance vibration that may cause noise in the three-phase generator 10. Depending on the strength of the winding
If the length l is 0.1 to 2 mm, sufficient decoupling of vibration can be obtained.

In FIGS. 2 and 3, this vibration and noise characteristic is clearly shown on the basis of a comparative diagram of all three curves. With windings fully impregnated,
That is, the curve measured and recorded in the three-phase generator 10 in which both the winding end portion 30 and the winding strand extending into the slot of the stator core 26 are completely impregnated with the synthetic resin for impregnation is a (solid line). Is drawn by. In this case, the winding 28 and the stator core 26 form a compact winding body. The curve profile measured and recorded in the three-phase generator 10 with no winding 28 impregnated is
It is drawn by b (broken line). Finally, c (dotted line)
1 illustrates the curve course of the three-phase generator 10 according to the invention. That is, in this case, as shown in FIG. 1, only the winding end 30 is impregnated, and the unimpregnated intermediate region 34 is considered.

FIG. 2 shows a vibration measurement result based on a so-called driving point measurement, in which a transfer function with respect to frequency is expressed in modulus (A /
It is marked as F). From the comparison of the characteristic curves, the vibration of the stator 24 caused by the impact is shown by the three-phase generator 1 with impregnated winding ends 30 according to the invention.
It can be seen that at 0, the attenuation is best. From this, as can be seen from the characteristic curve in FIG. 3 in which the noise level of the three-phase generator 10 with respect to the rotational speed is shown in decibels, the following is concluded. That is, it is concluded that the noise characteristics of the impregnated three-phase generator 10 according to the present invention have been most favorably elapsed.
As the rotational speed of the three-phase generator 10 increases, the difference in noise level becomes more apparent for a completely impregnated stator core or for a stator core 26 that is not impregnated at all.

[Brief description of the drawings]

FIG. 1 is a schematic partial view of a claw pole three-phase generator.

FIG. 2 is a graph showing vibration curves of different three-phase generators.

FIG. 3 is a graph showing noise level curves of different three-phase generators.

[Explanation of symbols]

 10 Three-Phase Generator 12 Rotor Shaft 14 Claw Pole Rotor 16 Pole Wheel 18 Claw Pole 20 Pole Wheel 22 Claw Pole 24 Stator 26 Stator Core 28 Winding 30 Winding End 32 Impregnated Area 34 Unimpregnated Area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Stephan Usbeck Germany Asperk Karl Straße 42

Claims (6)

[Claims] 1. An electric device having a stator having a stator core, for example, a three-phase generator, wherein a plurality of windings are assigned to the stator, and the windings are slots of the stator core. In an electric device in which a winding end portion that is fitted into the stator and axially protrudes from the stator core around the stator is formed by winding portions that intersect with each other, Electrical equipment characterized in that the winding end portion (30) is impregnated so that an unimpregnated region (34) remains between the stator core (26) and the impregnated portion (32). . 2. The unimpregnated region (34) has a length (l), which length (l) is the depth (I) at which the winding end (30) is immersed in the impregnation bath. The electric device according to claim 1, which can be set by t). 3. Electric device according to claim 2, characterized in that the length (l) is between 0.1 mm and 2 mm, preferably at least 1 mm. 4. The winding strands of the windings (28) extending into the slots of the stator core (26) are wrapped by pre-impregnated paper.
The electric device according to the item 1 to item 3. 5. Adjusting the degree of impregnation of the winding strands when the stator core (26) of an electrical device reaches a preset temperature via the heat sensitivity of the pre-impregnated paper. 5. The electric device according to claim 4, characterized in that 6. The impregnated portion of the winding end (30) and the optionally impregnated portion of the winding strand in the slot of the stator core are not impregnated (3
4. The electric device according to claim 1, wherein the electric device is separated from each other by 4).