Inactive part

Abstract

The invention relates to an inactive part of a dynamoelectric machine, comprising basalt, in particular at least one basalt fiber.

Description

[0001] Description

[0002] Inactive part

[0003] The invention relates to an inactive part of a dynamoelectric machine.

[0004] In addition to the magnetic active components, electrical machines also require non-magnetic support structures for power transmission. These components typically fulfill functions that often require high rigidity and strength. Metals are preferably used.

[0005] Metals require a lot of energy to produce and are usually heavy. Metals are often limited by production capacity and logistical and / or political constraints.

[0006] The invention is based on the object of improving this.

[0007] The object is achieved by claim 1, i.e. an inactive part of a dynamo-electric machine comprising basalt, in particular at least one basalt fiber.

[0008] The inactive part preferably comprises aluminum.

[0009] Active parts include coils, stators, and rotors, and are primarily used to generate torque. Inactive parts are other components of machines that do not generate torque, such as bearing shields, shafts, covers, housings, etc.

[0010] Basalt is readily available worldwide and can be continually reclaimed through volcanic activity.

[0011] The basalt fibers preferably have at least substantially the same density as the aluminum or the material containing the aluminum. The strength is advantageously approximately 30 times higher: basalt fiber approximately 4.4 kWh / kg; aluminum approximately 15 kWh / kg.

[0012] To manufacture the component, in particular entirely from, or at least with preferably basalt fibre-reinforced aluminium, only about half the energy is required compared to manufacturing from pure aluminium.

[0013] The higher strength of the composite material makes further material savings possible.

[0014] This leads to a further reduction in energy consumption per component and a corresponding reduction in costs.

[0015] Furthermore, this composite material comprising basalt and aluminum leads to increased sound absorption, which in turn reduces the environmental impact of sound.

[0016] In addition, the following advantages are offered compared to pure aluminum: extended temperature range, ecological compatibility, increased corrosion resistance, increased hardness, reduced settling behavior, reduced thermal conductivity (particularly advantageous for sensor decoupling). Furthermore, an ecological design with visible fabric is possible.

[0017] Non-woven mats made of aluminum-coated basalt fibers can also be used to manufacture suitable components.

[0018] Another possibility is, for example, for rotationally symmetrical parts, to wrap these aluminum-coated basalt fibers around a near-net shape.

[0019] In a preferred embodiment, the inactive part comprises at least one basalt fiber, wherein the basalt fiber is coated with a material containing aluminum. The aluminum is advantageously reinforced in this way.

[0020] It is possible to use pure aluminum. However, aluminum alloys can also be used.

[0021] The basalt fiber can also be arranged on an aluminum foil.

[0022] Another advantageous embodiment is one in which the coated basalt fiber is formed as a woven fabric, felt and / or knitted fabric.

[0023] The tissue can be two-dimensional or three-dimensional.

[0024] A fabric is a, preferably right-angled, crossing of two fibers or a crossing of different sections of a fiber.

[0025] Preferably, there is an at least substantially cross-shaped weave.

[0026] Alternatively or additionally, a felt or a knitted fabric is also possible.

[0027] The object is also achieved by a method for producing an inactive part, wherein the basalt fiber is coated with a material containing aluminum, wherein a woven fabric, felt and / or knitted fabric is formed by the coated fiber, wherein the woven fabric, felt and / or knitted fabric is compacted, preferably close to the final shape.

[0028] The woven fabric, the felt and / or the knitted fabric are preferably compacted in a form that represents the inactive part.

[0029] It is advantageous to compact the material with the addition of heat. This can be achieved, for example, by heating the mold from the outside.

[0030] The compaction and / or heating advantageously results in the formed component being sealed from the outside.

[0031] It is also possible that heating occurs during compression through electricity, friction and / or microwaves.

[0032] It is also advantageous if the material containing the aluminum is compacted and / or heated in such a way that it is bonded together in a metal-to-metal manner.

[0033] In this way, good tightness can be achieved.

[0034] Also advantageous is an embodiment according to which the woven fabric, the felt and / or the knitted fabric is rectangular or square, wherein the woven fabric, the felt and / or the knitted fabric is wound around a corrugated core, for example in the form of a rod, tube and / or winding mandrel, in such a way that a corrugation is formed.

[0035] The fabric, the felt and / or the knitted fabric can also be T-shaped, wherein the fabric, the felt and / or the knitted fabric is wound around a shaft core, for example in the form of a rod, tube and / or winding mandrel, in such a way that a shaft-supporting structure unit is formed.

[0036] This is shown in the figures.

[0037] The problem is further solved by using a basalt fiber, wherein the basalt fiber is coated with an aluminum-containing material, as a component, in particular as the sole component, of an inactive part of a dynamoelectric machine. The problem is further solved by a dynamoelectric machine comprising such an inactive part.

[0038] The machine can be a dynamoelectric rotary machine or a linear machine.

[0039] The invention is described and explained in more detail below with reference to the exemplary embodiments shown in the figures. They show:

[0040] FIG 1 a method,

[0041] FIG 2 shows an example of a cover,

[0042] FIG 3 shows an example of a plate and

[0043] FIG 4 various components,

[0044] FIG 5 a basalt fiber,

[0045] FIG 6 a fabric,

[0046] FIG 7 a winding,

[0047] FIG 8 a tissue .

[0048] In a process step S 1 of the process for producing an inactive part, the basalt fiber is coated with a material containing aluminum.

[0049] In a process step S2, a woven fabric, felt and / or knitted fabric is formed by means of the coated fiber.

[0050] In a process step S3, the woven, felt, or knitted fabric is placed in a mold that represents the inactive part to be formed. Alternatively or additionally, this can also be achieved by winding, see FIG. 7. In a process step S4, compaction takes place.

[0051] This can optionally be achieved by applying heat from the outside and / or applying current and / or applying microwaves for heating in a process step S5.

[0052] The fabric, felt and / or knitted fabric is preferably compacted close to the final shape.

[0053] Preferably, compression and / or heating is carried out in such a way that the material containing the aluminum is bonded in a metal-to-metal manner.

[0054] FIG. 2 shows an example of a cover 10. The cover 10 was manufactured using the described method and advantageously comprises a fabric comprising the basalt fiber coated with aluminum.

[0055] FIG 3 shows an example of a plate which is non-woven (for example felt or other knitted fabric).

[0056] FIG 4 shows various components of a dynamoelectric rotary machine 29 which can be manufactured in the manner described or which comprise the basalt fiber.

[0057] The figure shows a shaft 21, a bearing plate 20 and a bearing plate 22, as well as a supporting structure 23 of a rotor 30. These are advantageously inactive parts.

[0058] The rotor 30 can be part of a permanent-magnet synchronous machine, and thus the inactive support structure can carry magnets. However, it can also be the support structure of a squirrel-cage or slip-ring rotor. The torque-generating element is marked 24 purely as an example.

[0059] The figure also shows a stator 25. A housing 31 is also an inactive part and can comprise the basalt fiber with aluminum or be made of it.

[0060] The invention allows the solid, metallic materials of the inactive parts to be replaced with basalt fiber-reinforced aluminum. For this purpose, aluminum-coated basalt fibers are advantageously processed into fabrics, particularly 3D fabrics, and then compacted and bonded in a thermal process close to the final shape, thus advantageously sealing the component from the outside.

[0061] As an alternative to fabrics, it is also possible to process them into felt or knitted fabrics, which can then be compacted into a shape using a thermal process.

[0062] The thermal process preferably takes place in a mold appropriate to the target part. The heat that bonds the aluminum to the metal is introduced from the outside, for example, via the mold, or generated by electricity, friction, or microwaves. Other methods are also conceivable.

[0063] FIG 5 shows a basalt fiber 100 and a sheath 101 with a material containing aluminum.

[0064] FIG. 6 shows an example of a suitable fabric 60. The coated basalt fiber 100 is preferably formed as a woven fabric, felt, and / or knitted fabric. The fabric in FIG. 6 is formed as an endless fabric with weft threads 61. Weft threads in the axial direction advantageously provide high flexural strength and rigidity.

[0065] In woven fabrics, for example, parallel threads are arranged in the direction of the developing fabric, as well as advantageously at least substantially transverse threads, in particular threads running perpendicular thereto. The threads are advantageously shot through the longitudinal threads.

[0066] FIG. 7 shows a winding process. A fabric 70 comprising basalt fibers on an aluminum foil or basalt fibers coated with aluminum is preferably T-shaped.

[0067] The aluminum foil can be made of aluminum or contain aluminum.

[0068] The fabric is wound around a corrugated core. The corrugated core can be, for example, a rod, a tube, and / or a winding mandrel.

[0069] The fabric is wound around the shaft core, see reference numeral 71, for example under temperature and / or pressure, such that a shaft-supporting structure unit 72 is formed. This shaft-supporting structure unit 72 is preferably one-piece.

[0070] By winding up only one wave can be formed.

[0071] Winding can also create a supporting structure for a rotor or stator. In this case, the winding aid can be removed later.

[0072] The fabric shown in FIG 6 is particularly suitable for this purpose.

[0073] The fibers are advantageously arranged as long fibers in such a way that they counteract the loads, deflection and torsion, with high rigidity.

[0074] The connection between the basalt long fibers and the aluminum matrix is ​​advantageously a mixture of mold and material bonding.

[0075] The basalt fiber content is advantageously at least 30% and at most 80% of the shaft volume. The shaft can have axially different diameters, e.g., to create stops or fits for ball bearings. For this purpose, fibers, tapes, and / or fabrics are advantageously wound tangentially around the shaft, or the base textile already has a corresponding weave / cut pattern.

[0076] The aluminum is applied, for example, as a coating on the basalt fiber. Additional aluminum fibers or aluminum foil may also be included in the winding body.

[0077] Aluminium can also be introduced by subsequent infiltration.

[0078] The solidification of the wound shaft is preferably carried out by means of thermal processes.

[0079] The shaft is preferably manufactured additively to a near net shape so that little or no machining or other smoothing processes are required for completion.

[0080] Smoothing processes can also be used to increase surface density and strength. Possible smoothing processes include DensiForm, rolling, shot peening, hot stamping, and / or press hardening.

[0081] In a special design, steel sleeves are applied to areas subject to particularly high mechanical stress, e.g. on the A-side shaft end.

[0082] To enable higher stresses, the shaft can be treated with hardening processes such as pressing, hot pressing, thermal shock.

[0083] In one specific embodiment, for example, in radial-field machines, the supporting structure, particularly the magnetic support structures, is integrated into the shaft manufacturing process. In addition to the supporting structures, bores, pins, or end structures for balancing are also incorporated. In another embodiment, basalt fibers already coated with aluminum are used for further processing.

[0084] One advantage of a motor shaft made of or with basalt fiber-reinforced aluminum is, for example, at least 15% lower energy consumption for material and production with the same rigidity compared to a steel shaft.

[0085] A weight reduction compared to a steel shaft is also advantageous and amounts to approximately 60%.

[0086] A further advantage is high intrinsic vibration damping with the same stiffness. Due to the non-magnetic behavior, the transmission of disruptive magnetic fields, e.g., to the position sensors, is reduced.

[0087] Further advantages include low corrosion sensitivity, reduced stress concentration in the case of diameter jumps or shaft shoulders and higher strength, particularly under alternating loads.

[0088] FIG 8 shows another possible embodiment of a fabric 80.

Claims

Patent claims 1. Inactive part of a dynamoelectric machine (29), comprising at least one basalt fiber (100), wherein the basalt fiber (100) is coated with a material which comprises aluminum, and wherein the coated basalt fiber (100) is designed as a woven fabric (60, 70, 80), felt and / or knitted fabric.

2. Inactive part according to claim 1, wherein the inactive part is a shaft (21), a bearing plate (20, 22) and / or a supporting structure (23) of a rotor (30) and / or stator (25).

3. Inactive part according to claim 1 or 2, formed from coated basalt fiber (100) as a woven fabric (60, 70, 80), felt and / or knitted fabric, compacted in a form depicting the inactive part.

4. A method for producing an inactive part according to one of claims 1 to 3, wherein a basalt fiber (100) is coated with a material comprising aluminum, wherein a woven fabric (60, 70, 80), felt and / or knitted fabric is formed by the coated fiber (100), wherein the woven fabric (60, 70, 80), the felt and / or the knitted fabric are compacted in a form that depicts the inactive part.

5. The method according to claim 4, wherein compression is carried out with the introduction of heat.

6. Method according to one of claims 4 or 5, wherein heating is carried out during compression by electricity, friction and / or microwaves.

7. Method according to one of claims 4 to 6, wherein compression and / or heating is carried out in such a way that the material comprising the aluminum is bonded by a metal-to-metal bond.

8. Method according to one of claims 4 to 7, wherein the fabric, the felt and / or the knitted fabric is rectangular or square. is formed in a table, wherein the fabric (60, 70, 80), the felt and / or the knitted fabric is wound around a shaft core, for example in the form of a rod, tube and / or winding mandrel, in such a way that a shaft is formed.

9. Method according to one of claims 4 to 8, wherein the woven fabric, the felt and / or the knitted fabric is T-shaped, wherein the woven fabric (60, 70, 80), the felt and / or the knitted fabric is wound around a shaft core, for example in the form of a rod, tube and / or winding mandrel, in such a way that a shaft support structure unit (72) is formed.

10. Use of a basalt fiber (100), wherein the basalt fiber (100) is coated with a material comprising aluminum, as a component of an inactive part, in particular a shaft (21), a bearing plate (20, 22) and / or a supporting structure (23) of a rotor (30) and / or stator (25) of a dynamoelectric machine.

11. Dynamoelectric machine (29) comprising an inactive part according to one of claims 1 to 3.

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