resolvers

Abstract

The invention relates to a resolver comprising a first structural unit (1) and a second structural unit (2), wherein the structural units (1, 2) are rotatable relative to one another about an axis (A). The first structural unit (1) comprises a first winding (1.1) arranged in a first housing (1.2). The first housing (1.2) has a first housing cover (1.21) and a second housing cover (1.22), wherein the first housing cover (1.21) has a first web (1.211) and the second housing cover (1.22) has a second web (1.221). The webs (1.211, 1.221) extend with an axial directional component and are engaged in one another in a toothing manner offset in a circumferential direction. The first housing cover (1.21) has a first spacer (1.213) arranged radially offset relative to the first web (1.211) of the first housing cover (1.21) and extending with a directional component parallel to the first web of the first housing cover (1.21).

Description

Technical Field

[0001] This invention relates to a decomposer, and more particularly to a brushless decomposer.

[0002] In electrical engineering, an electromagnetic measurement transducer, known as a resolver, is used to convert the angular position of a rotor into electrical parameters or signals. These signals are ultimately used to determine the relative angular position between two structural units that can rotate relative to each other, such as two machine parts that can rotate relative to each other. In this application, the term resolver also includes measurement transducers, referred to as synchronous transducers or resolvers.

[0003] In a resolver, staggered stator windings are typically arranged within a housing, surrounding a rotor with rotor windings located within the housing. In this case, not only the stator windings but also the rotor windings are arranged on corresponding laminations for guiding the magnetic flux. The laminations consist of multiple individual metal plates, typically made of a soft magnetic material to enhance their electromagnetic effect.

[0004] In a brushless decomposer, the supply voltage is transmitted contactlessly to the rotating windings of the transformer via the stationary windings. The stator-side and rotor-side windings are typically arranged separately within the transformer housing.

[0005] These resolvers are mostly manufactured in large quantities, thus providing simple and automated manufacturing as much as possible. Background Technology

[0006] A brushless decomposer is disclosed in publication DE 10 2009 020 327 A1, wherein the housing for the winding of a transformer is composed of two housing covers having contacts that engage with each other. Summary of the Invention

[0007] The objective of this invention is to provide a resolver that has extremely high measurement accuracy and can be manufactured with minimal cost.

[0008] This task is solved according to the features of the present invention.

[0009] Accordingly, the resolver includes a first structural unit and a second structural unit, wherein the structural units are rotatable relative to each other about an axis. The resolver is adapted to determine the relative angular position between the two structural units. The first structural unit includes a first winding disposed in a first housing and the second structural unit includes a second winding disposed in a second housing. The first housing has a first housing cover and a second housing cover, wherein the first housing cover has a first tab and the second housing cover has a second tab. The first tab and / or the second tab extend in an axial direction component, i.e., in a direction component parallel to the axis. Furthermore, the first tab and the second tab are axially overlapping and engaging with each other in a circumferentially offset manner. The first housing cover has a first spacer, which is arranged radially offset relative to the first tab and extends in a direction component parallel to the first tab of the first housing cover and / or the second tab of the second housing cover.

[0010] Below, the terms "radial" and "axial" refer to the axes around which structural units can rotate relative to each other. Thus, "axial" means parallel to the axis and "radial" means orthogonal to the axis.

[0011] Advantageously, the second housing cover has a second partition, which is arranged radially offset from the second joint of the second housing cover, and the second partition extends in a direction component parallel to the second joint of the second housing cover and / or the first joint of the first housing cover.

[0012] In another embodiment of the invention, the first housing cover or the second housing cover, or both housing covers, are made of metal plates, the materials of which include nickel and iron.

[0013] Advantageously, the metal sheet has a thickness of less than 0.75 mm, especially less than 0.6 mm, and especially less than 0.5 mm.

[0014] Advantageously, the first housing cover is designed such that the end of the first tab is correspondingly opposite to the second section of the second housing cover. Furthermore, the end of the second tab can be opposite to the first section of the first housing cover.

[0015] In another embodiment of the invention, the second section of the second housing cover is arranged radially beyond or flush with one of the first tabs of the first housing cover. Similarly, the first section of the first housing cover can be arranged radially beyond or flush with one of the second tabs of the second housing cover.

[0016] Advantageously, the first partition or the second partition, or both of them, extend in the circumferential direction at an angle of at least 90°, especially at least 120°, especially at least 270°. Advantageously, the first partition or the second partition, or both of them, extend in the circumferential direction at an angle of 360°, that is, over the entire circumference.

[0017] In another embodiment of the invention, the first partition extends in the same direction as the second partition. That is, for example, the free ends of the partitions point in the same direction.

[0018] Advantageously, the first and second partitions each have the same distance from the axis. The partitions are located, in particular, on the surface of a virtual cylinder whose axis of symmetry coincides with the axis around which the structural units can rotate relative to each other.

[0019] Advantageously, the first spacer or the second spacer, or both, are arranged radially opposite the second winding and / or the second housing. Thus, one or both spacers are arranged opposite the second winding or the second housing such that there is a gap in the radial direction between the spacer and the second winding, or between the spacer and the second housing.

[0020] In another design of the present invention, the first housing is arranged radially outside the second housing, or in other words, the first housing surrounds the second housing.

[0021] The design of the resolver according to the present invention enables high measurement accuracy while reducing material requirements.

[0022] In another embodiment of the invention, the resolver is constructed as a brushless resolver and the windings are associated with a transformer.

[0023] The housing can be advantageously formed from a single sheet of metal. Furthermore, the housing can be manufactured through stamping and bending processes.

[0024] A particular advantage is that the housing is designed to be rotationally symmetrical about the axis.

[0025] Further details and advantages of the resolver according to the invention will become apparent from the following description of the embodiments with reference to the accompanying drawings. Attached Figure Description

[0026] Figure 1 A longitudinal cross-sectional view of the resolver is shown. Figure 2 A top view of the first housing cover is shown. Figure 3 A perspective view of the first housing cover is shown. Figure 4 A perspective view of the second housing cover is shown. Figure 5 A perspective view of the first housing is shown. Figure 6 An enlarged cross-sectional view through the first housing is shown. Detailed Implementation

[0027] according to Figure 1 The resolver includes two structural units 1 and 2 that can rotate relative to each other about axis A, for example, a stator as the first structural unit 1 and a rotor as the second structural unit 2. The first structural unit 1 has a resolver housing 1.3, which has a region serving as a retainer 1.31 for the lamination assembly 1.4. A receiving winding 1.5 is arranged on the lamination assembly 1.4. In this embodiment, two receiving windings 1.5 are provided that are staggered by 90°.

[0028] Furthermore, the first structural unit has a holding region 1.32 for accommodating a transformer component consisting of a winding 1.1 and a first housing 1.2 enclosing the winding 1.1. The first housing 1.2 includes a first housing cover 1.21 and a second housing cover 1.22. A dielectric carrier 1.23 (see [reference]) is arranged between the winding 1.1 and the housing covers 1.21 and 1.22. Figure 6 The housing covers 1.21 and 1.22 have tabs 1.211 and 1.221, respectively, which are oriented in the axial direction component and engaged together in an axially overlapping manner, staggered from each other in the circumferential direction (see also...). Figure 5 ).

[0029] The second structural unit 2 is based on Figure 1 The device has a shaft 2.3 on which a retaining region 2.32 is formed. This retaining region includes a winding 2.1 and a second housing 2.2 enclosing the winding 2.1 to accommodate transformer components on the rotor side. The second housing 2.2 also includes a carrier 2.21 made of dielectric material, which houses the second winding 2.1. A lamination assembly 2.4 with a transmitting winding 2.5 is arranged on the retaining member 2.31 of the shaft 2.3. Typically, the transmitting winding 2.5, together with the lamination assembly 2.4, is cast with refractory material after the second structural unit 2 is assembled. (Note: The last sentence appears to be incomplete and possibly refers to a separate, unrelated detail.) Figure 1 The image shows the castable material.

[0030] In the illustrated embodiment, shaft 2.3 is designed as a hollow shaft in which the motor shaft is fixed against relative rotation, and the angular position of the motor shaft is to be determined.

[0031] exist Figure 2 The top view shows the first housing cover 1.21 and... Figure 3 The first housing cover is shown in three dimensions. The first housing cover 1.21 includes a first tab 1.211 ( Figure 3The first housing 1.21 consists of a first segment 1.212 and a first partition 1.213. The first housing 1.21 is made of a flat metal sheet from which a one-piece stamped part is first separated. This stamped part is then shaped by a bending process such that the first tab 1.211 and the first partition 1.213 exist, while the first segment 1.212 remains undeformed. The first tab 1.211 has an end portion 1.211a or face on its end side, produced by the stamping process. Similarly, the first segment 1.212 has an end portion 1.212a or face on its end side, produced by the stamping process. The end portion 1.212a of the first segment 1.212 is arranged at a distance D relative to the diametrically opposed end portion 1.212a. The first partition 1.213 is arranged radially inwardly offset relative to the first tab 1.211 and extends in the axial direction parallel to the first tab 1.211. Furthermore, the first housing cover 1.21 includes a hole 1.214, which is provided for threading stranded wires. Figure 3 As in other accompanying drawings, for clarity, not all parts, such as all joints, are given corresponding reference numerals.

[0032] exist Figure 4 The second housing cover 1.22 is shown in perspective. The second housing cover 1.22 is also manufactured by a stamping and bending process. The second housing cover 1.22 includes a second tab 1.221, a second segment 1.222, and a second spacer 1.223. The second tab 1.221 has an end portion 1.221a or face on its end side, formed by a stamping process. Furthermore, the end portion 1.222a or face on the end side of the second segment 1.222 is formed by a stamping process. The end portion 1.222a on the end side of the second segment 1.222 is arranged radially to the opposite end portion 1.222a at a distance D. The second spacer 1.223 is arranged radially inwardly offset relative to the second tab 1.221 and extends in the axial direction, parallel to the direction component of the second tab 1.221.

[0033] The two housings, 1.21 and 1.22, are made of metal plates only 0.35 mm thick, and the materials of these plates include nickel and iron or silicon and iron. These materials have relatively high magnetic permeability.

[0034] The two housing covers 1.21 and 1.22 are based on Figure 5 In order to form the first housing 1.2, the tabs 1.211 and 1.221, oriented in the axial direction component, are mounted together in a staggered manner in the circumferential direction.

[0035] The first housing 1.2, thus constructed, can then be installed into the resolver housing 1.3. Advantageously, the end portions 1.212a and 1.222a of the first section 1.212 and the second section 1.222 have a relatively precise distance D with small dimensional tolerances due to the stamping process (and in these portions where no deformation occurs). Figure 2 , 4 In particular, the first section 1.212 of the first housing cover 1.21 extends radially beyond the second tab 1.221 of the second housing cover 1.22 (h). Figure 5 , 6 Similarly, the second section 1.222 of the second housing cover 1.22 is arranged with a radial extension h (h≥0) relative to the first tab 1.211 of the first housing cover 1.21.

[0036] Thus, the surfaces of the end portions 1.212a, 1.222a, or segments 1.212, 1.222, on the end side can be used for centering of the first housing 1.2 within the resolver housing 1.3.

[0037] The second housing 2.2 is mounted on the shaft 2.3 such that the rotor-side winding 2.1 is arranged radially relative to the stator-side winding 1.1 (see...). Figure 1 In particular, the first spacer 1.213 and the second spacer 1.223 are arranged radially opposite to the second winding 2.1 or radially opposite to the second housing 2.2.

[0038] The relative angular position between the first structural unit 1 and the second structural unit 2 can be determined using a corresponding resolver. For this purpose, a sinusoidal alternating current is applied to the winding 1.1 of the first structural unit 1, resulting in an alternating voltage with a preset conversion ratio induced in the winding 2.1 of the second structural unit 2. This alternating voltage is then applied to the transmitting winding 2.5 of the second structural unit 2, causing a corresponding output voltage to be induced in the receiving winding 1.5 of the first structural unit 1 surrounding the transmitting winding 2.5 of the second structural unit 2. Using the two receiving windings 1.5 of the first structural unit 1, which are staggered by 90°, two voltage signals with a 90° phase shift can be subsequently tapped, depending on the relative angular position between the first structural unit 1 and the second structural unit 2. Therefore, the current resolver is designed as a brushless or slip-ring-free resolver.

[0039] Especially Figure 6As shown, the end portion 1.211a of the first tab 1.211 belonging to the first housing cover 1.21 is opposite to the second section 1.222 of the second housing cover 1.222. Specifically, the end portion 1.211a of the first tab 1.211 can contact the second section 1.222 of the second housing cover 1.22. Similarly, at another location (offset in the circumferential direction), the end portion 1.221a of the second tab 1.221 of the second housing cover 1.22 is opposite to the first section 1.212 of the first housing cover 1.21. Here, the end portion 1.221a of the second tab 1.221 can also contact the first section 1.212 of the first housing cover 1.21. Therefore, the magnetic field appearing at the end portions 1.211a and 1.221a of the tabs 1.211 and 1.221 is directly guided into the opposite second housing cover 1.22. Therefore, this structure minimizes scattering losses. The material selection for the metal plates of the two housings 1.21 and 1.22 described above allows for the use of extremely thin metal plate thicknesses, thereby enabling the resolver to be manufactured with good electromagnetic properties with relatively low material consumption.

[0040] In the illustrated embodiment, the first spacer 1.213 and the second spacer 1.223 extend in the same direction, that is, the ends of 1.213 and 1.223 point in the same direction (in... Figure 6 (From center to left) or in other words, the orientation of septa 1.213 and 1.223 is not parallel to the opposite direction.

[0041] By arranging spacers 1.213 and 1.223 relative to the second housing 2.2 or relative to the second winding 2.1, the resolver is relatively insensitive to axial movement between the first structural unit 1 and the second structural unit 2. This is because the spacers 1.213 and 1.223, extending in the axial direction, are positioned opposite the second housing 2.2 or the second winding 2.1 over relatively large axial movements. This results in maintaining a high conversion ratio over large axial movements. Furthermore, spacers 1.213 and 1.223 also have the advantage of being mechanically rigid or stable despite the thin wall thickness of the housing covers 1.21 and 1.22.

Claims

1. A decomposer, comprising a first structural unit (1) and a second structural unit (2), wherein, Structural units (1, 2) are capable of rotating relative to each other about axis (A), and the resolver is adapted to determine the relative angular position between two structural units (1, 2), wherein, The first structural unit (1) includes a first winding (1.1) arranged in the first housing (1.2), and The second structural unit (2) includes a second winding (2.1) arranged in the second housing (2.2), wherein, The first housing (1.2) has a first housing cover (1.21) and a second housing cover (1.22), wherein, The first housing cover (1.21) has a first tab (1.211), and The second housing cover (1.22) has a second tab (1.221), wherein, The tabs (1.211, 1.221) extend in the axial direction and engage with each other in a staggered manner in the circumferential direction, characterized in that... The first housing cover (1.21) has a first partition (1.213) arranged radially offset from the first tab (1.211) of the first housing cover (1.21), and the first partition extends in a direction component parallel to the first tab (1.211) of the first housing cover (1.21).

2. The decomposer according to claim 1, wherein, The second housing cover (1.22) has a second partition (1.223) arranged radially offset from the second tab (1.221) of the second housing cover (1.22), and the second partition extends in a direction component parallel to the second tab (1.221) of the second housing cover (1.22).

3. The decomposer according to claim 1 or 2, wherein, The first housing cover (1.21) and / or the second housing cover (1.22) are made of metal plates, the materials of which include nickel and iron.

4. The resolver according to any one of the preceding claims, wherein, The first housing cover (1.21) and / or the second housing cover (1.22) are made of metal plates, the metal plates being made of materials including silicon and iron.

5. The resolver according to any one of the preceding claims, wherein, The first housing cover (1.21) and / or the second housing cover (1.22) are made of metal plates having a thickness of less than 0.75 mm.

6. The resolver according to any one of the preceding claims, wherein, The first housing cover (1.21) is designed such that the end (1.211a) of the end side of the first tab (1.211) is opposite to the second section (1.222) of the second housing cover (1.22).

7. The resolver according to any one of the preceding claims, wherein, The second housing cover (1.22) is designed such that the end (1.221a) of the end side of the second tab (1.221) is opposite to the first section (1.212) of the first housing cover (1.21).

8. The resolver according to any one of the preceding claims, wherein, The second section (1.222) of the second housing cover (1.22) is arranged radially overhanging (h) or flush with one of the first tabs (1.211) of the first housing cover (1.21).

9. The resolver according to any one of the preceding claims, wherein, The first section (1.212) of the first housing cover (1.21) is arranged radially overhanging (h) or flush with one of the second tabs (1.221) of the second housing cover (1.22).

10. The resolver according to any one of the preceding claims, wherein, The first spacer (1.213) and / or the second spacer (1.223) extend in the circumferential direction through an angle of at least 90°.

11. The resolver according to any one of the preceding claims, wherein, The first partition (1.213) and / or the second partition (1.223) extend through an angle of 360° in the circumferential direction.

12. The resolver according to any one of the preceding claims, wherein, The second housing cover (1.22) has a second partition (1.223) arranged radially offset from the second tab (1.221) of the second housing cover (1.22), and the second partition extends in a directional component parallel to the tabs (1.211, 1.221) of the second housing cover (1.22), wherein the first partition (1.213) and the second partition (1.223) extend in the same direction.

13. The resolver according to any one of the preceding claims, wherein, The second housing cover (1.22) has a second partition (1.223) arranged radially offset from the second tab (1.221) of the second housing cover (1.22), and the second partition extends in a direction component parallel to the tabs (1.211, 1.221) of the second housing cover (1.22), wherein the first partition (1.213) and the second partition (1.223) each have the same distance from the axis (A).

14. The resolver according to any one of the preceding claims, wherein, The first spacer (1.213) and / or the second spacer (1.223) are arranged to be radially opposite the second winding (2.1) and / or the second housing (2.2).

15. The resolver according to any one of the preceding claims, wherein, The first housing (1.2) is arranged radially outside the second housing (2.2).

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