DE102007021151A1 - Resolver, has components rotatable around axis, where one of components includes coils, lamination stacks and retainer, and coils arranged at lamination stacks that include individual sheet metals and mounted at retainer - Google Patents

Abstract

The resolver has two components (1, 2) rotatable around an axis (A), where the resolver is suitable for determination of a relative angular position between the two components. One of the components includes coils (1.1, 2.1), lamination stacks (1.2, 2.2) and retainers (1.31, 2.31). The coils are arranged at the lamination stacks that include individual sheet metals and are mounted at the retainer. The individual sheet metals are made of materials i.e. copper, where the single sheet metal from the one of the materials contacts the retainer. An independent claim is also included for a method for operating a resolver.

Description

The The invention relates to a resolver, according to the preamble of claim 1 or a method for producing such Resolver according to claim 8.

When Resolver is called in electrical engineering an electromagnetic Transducer for converting the angular position of a rotor into an electrical one Size, or in electrical signals. In the present The term resolver also includes transducers that use Synchro or resolver are called or also called RVDT (rotary variable differential transformer).

Often are staggered stator windings in a housing in a resolver arranged one inside the housing Enclose rotor with rotor windings. In this case, both the stator windings and the rotor windings on one Laminated core arranged, which is more or less as a lens for the electromagnetic waves acts to bundle them. The Laminated cores consist of a large number of individual sheets, which in the Usually consist of a soft magnetic material, so that their electromagnetic effect is increased.

such Resolvers are usually made in large numbers, So here's a simple, automated as possible production is required.

In the published patent application EP 1408309 A1 is particular in the 1 a brushless resolver shown, in which both the stator and the rotor laminated cores are mounted on brackets.

One Such structure has disadvantages in terms of measurement accuracy and, moreover, it is only comparatively large Effort manufacturable or mountable.

Of the Invention is therefore the object of a resolver create, which has a very high measurement accuracy and continue to produce with minimal effort.

These The object is achieved by the features of claims 1 and 8 solved.

Corresponding the resolver according to the invention comprises two μm an axle rotatable units, in particular a rotor and a Stator, with the resolver to determine the relative angular position between the two units is suitable. At least one of the Building units has windings, a special laminated core and a Mount on. The windings are arranged on the laminated core or applied to the laminated core, wherein the laminated core several individual sheets includes and the laminated core is also mounted on the bracket. In this case, a single sheet of the laminated core is made of a first material manufactured and other individual sheets of the laminated core from a second Material, wherein the single sheet of the first material, the holder, in particular, generating radial with respect to the axis Tensions, touched.

With Advantage is the single sheet, which touches the holder, from a mechanically softer material than the individual sheets, which Do not touch the bracket of the laminated core. consequently So the first material is mechanically softer than the second material. By mechanically softer can be understood below that the first material has a smaller modulus of elasticity or a lower hardness as the second material. Accordingly, the first material is like that chosen that this at a given mechanical Stress load already plastically deformed while at the same voltage load, the second material only elastic is deformed.

When Material for the first material, ie for the Single sheet, which touches the holder come with Advantage of copper or an alloy containing more than 50% by weight of copper into consideration, for example brass. As second material can with Advantage of a soft magnetic material, such as a FeSi or FeNi alloy to get voted.

Of the The invention is based on the finding that the soft magnetic Materials under mechanical stress, for example in radial Pressure or radial stresses, their magnetic properties irreversibly alter adversely, causing damage by such stress later in the measurement accuracy of Resolvers negatively noticeable. Furthermore, in conventional Resolvers relatively large eccentricities of the laminated cores inevitable. Such eccentrically mounted laminated cores lead to further losses of the measuring accuracy. By the invention Now be the soft magnetic individual sheets from the second Material neither during assembly nor during operation of the resolver noteworthy subjected to mechanical stresses, so that their magnetic properties optimal with regard to an accurate measurement result after successful Remain assembly. Moreover, the single sheet offers from the first material a good centering of the laminated core on the holder.

Advantageously, the single sheet of the first material which contacts the holder has a greater thickness than the individual sheets of the laminated core, which consist of the second material and do not touch the holder. For example, the individual sheets of the second material can be a Di have from 0.1 mm to 0.5 mm, in particular 0.2 mm to 0.35 mm. The individual sheets of the first material may be designed to be thicker or thicker by 0.3 mm to 1 mm than the individual sheets of the second material. Furthermore, the individual sheets of the first material can touch the holder under radial mechanical tension. In this case, the radial mechanical stress during assembly on the holder can be so large that the single sheet is plastically deformed from the first material.

In Another embodiment of the invention, the different from Materials existing individual sheets of the laminated core one each same geometric contour. Often the individual sheets have a substantially annular shape. In this case the respective outer contours and / or the respective inner contours of the individual sheets of different materials be the same in each case.

According to one Another aspect of the invention is a method for the production discloses a resolver comprising the steps of: providing a first sheet of a first material, providing a second sheet of a second material, separating from individual sheets the first and the second plate, joining the individual sheets from the first material and the second material to a laminated core, Applying windings to the laminated core, mounting the laminated core To a holder in such a way that the single sheet of the first Material touches the holder.

In further embodiment of the method according to the invention is the separation of the individual sheets of the first and the second Sheet metal made with a stamping process. In particular, for example using contour-identical punching tools in a simple way be ensured that the individual sheets from the second Material have the same contour as the individual sheets from the first material. Alternatively, the individual sheets be separated about with a laser separation process.

With The individual sheets can be advantageous with the aid of a stamped packetizing method or be joined by a gluing process to form a laminated core. When using the often cheaper and automatable punching packetization method, the invention Advantage on that even with comparatively large tolerances the outer contours of the laminated core no deformations of projecting single sheets of the second material occur so that even with a cost-effective joining method Resolvers can be created that have a high measuring accuracy exhibit.

The Invention is particularly advantageous when an automated Assembly of the resolver is done. Advantageously, the resolver is constructed in such a way that when assembling the laminated core to the holder, the laminated core is moved axially, with the contact between the holder and the single sheet of the first material centered the laminated core becomes.

advantageous Embodiments of the invention takes the dependent Claims.

Further Details and advantages of the invention Resolvers and the corresponding manufacturing process from the following description of an embodiment with reference to the attached figures.

It show the

1 a longitudinal sectional view of a resolver,

2 a detailed view of the stator in section,

3 a detailed view of the rotor in section.

According to the 1 For example, the resolver includes two assemblies that are relatively rotatable about an axis A, namely a stator 1 as the first unit and a rotor 2 as a second unit. The stator 1 has a housing 1.3 on with an area of as a bracket 1.31 for a laminated core 1.2 serves. At this laminated core 1.2 are windings 1.1 , here made of copper wire, which serve as receiver coils. In the present embodiment are two offset by 90 ° windings 1.1 intended. Furthermore, the stator has 1 transformer windings 1.4 on. The in the figures not presented Darge electrical feed or discharge from the windings 1.1 and the transformer windings 1.4 be through a hole 1:32 from the inside of the case 1.3 led to the outside.

The rotor 2 has a wave 2.3 on, at the likewise transformer windings 2.4 is attached. In the embodiment shown, the shaft 2.3 designed as a hollow shaft in which, for example, a motor shaft whose angular position is to be determined, can be fixed against rotation. On a bracket 2.31 the wave 2.3 is a laminated core 2.2 with windings 2.1 arranged. Usually, the windings 2.1 complete with laminated core 2.2 after assembling the rotor 2 potted with a potting compound. The potting compound is not shown in the figures for clarity.

The laminated core 1.2 of the stator 1 and the laminated core 2.2 of the rotor 2 consist of several individual sheets 1.21 . 1.22 . 2.21 . 2.22 with grooves. One single sheet each 1.21 . 2.21 of each laminated core 1.2 . 2.2 is designed as a 0.8 mm thick copper sheet, while the remaining individual sheets 2.21 . 2.22 the laminated cores 1.2 . 2.2 consist of a soft magnetic sheet, in particular of a FeSi or FeNi alloy and have a thickness of about 0.3 mm.

In the exemplary embodiment presented, the copper sheet and the FeSi sheet are provided in the first two production steps S1, S2. With the help of a punching process then in step S3 with one and the same punching tool all individual sheets 1.21 . 1.22 of the stator 1 and with a further punching tool all individual sheets 2.21 . 2.22 of the rotor 2 separated from the respective sheets. In this simple way is thus achieved that all individual sheets 1.21 . 1.22 of the stator 1 and all individual sheets 2.21 . 2.22 of the rotor 2 have the same geometric contour:
The so separated individual sheets 1.21 . 1.22 . 2.21 . 2.22 are then in step S4 using a Stanzpaketierverfahrens each to a laminated core 1.2 . 2.2 together. Here are the individual sheets 1.21 . 1.22 . 2.21 . 2.22 rotated by a certain number of slots against each other, so that a high magnetic homogeneity is achieved, so that a high accuracy of the resolver is ensured during operation. The punching packetizing process is a highly economical, automatable method for assembling the individual sheets 1.21 . 1.22 . 2.21 . 2.22 in which the individual sheets 1.21 . 1.22 . 2.21 . 2.22 only be held together at a few points of connection. However, this method has the disadvantage that laminated cores produced in this way 1.2 . 2.2 have relatively large tolerances of their outer contour, that is always single sheets 1.21 . 1.22 . 2.21 . 2.22 slightly offset radially from the laminated core 1.2 . 2.2 protrude.

In the next step S5 of the production of a resolver according to the invention, the windings 1.1 . 2.1 on the laminated cores 1.2 . 2.2 applied, or are the laminated cores 1.2 . 2.2 wound so that the grooves are filled and finally the windings 1.1 . 2.1 at the laminated cores 1.2 . 2.2 are arranged. The laminated core 2.2 of the rotor 2 with the corresponding windings 2.1 is then provided with a potting compound.

The wound laminated core 1.2 the stator is then inserted into the housing 1.3 1 in the course of automated assembly (step S6) inserted until the single sheet 1.21 under radial stresses on the bracket 1.31 and axially abuts a shoulder with undercut. The radial stresses on the single sheet 1.21 made of copper so large that this is plastically deformed, allowing a tight fit of the laminated core 1.2 is ensured on the housing. Furthermore, the transition fit between the laminated core 1.2 and the holder 1.31 an exact centering of the laminated core 1.2 reached. This is important in terms of measurement accuracy of the resolver. Although the outer contour of the laminated core 1.2 a large tolerance by individual radially projecting individual sheets 1.22 may have a compressive load of the individual sheets concerned 1.22 be prevented because none of the individual sheets 1.22 the housing 1.3 touched at any time.

Furthermore, in step S6, the wound and cast laminated core 2.2 of the rotor 2 also automatically on the holder 2.3 of the rotor mounted by axial sliding. Again, only touches the single sheet 2.21 made of copper the holder 2.3 analogous to the stator 1 under radial stresses, with the support centering and the radial stresses to plastic deformation of the single sheet 2.21 can lead from copper.

By a corresponding resolver, the relative angular position between the stator 1 and the rotor 2 be determined. For this purpose, the transformer windings 1.4 of the stator 1 with a sinusoidal alternating current applied, which has the consequence that in the transformer windings 2.4 of the rotor 2 an alternating voltage is induced at a predetermined transformation ratio. This alternating voltage is thus also applied to the windings 2.1 of the rotor 2 put on so that in the windings 1.1 of the stator 1 which the windings 2.1 of the rotor 2 enclose, corresponding output voltages are induced. When using two windings offset by 90 ° 1.1 of the stator 1 can then be tapped by two 90 ° out of phase voltage signals, which depends on the relative angular position between stator 1 and rotor 2 depend. The present resolver is therefore designed as a brush or slip-ringless resolver.

The inventive method can be created economically a resolver, which corresponds to the highest requirements in terms of measurement accuracy, since by avoiding mechanical stresses of the soft magnetic individual sheets 1.22 . 2.22 an extremely high magnetic homogeneity is achievable and the laminated cores 1.2 . 2.2 Moreover, they are installed exactly centered.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1408309 A1 [0005]

Claims (14)

Resolver comprising two assemblies (A) rotatable about an axis (A) 1 ; 2 ), wherein the resolver for determining the relative angular position between the two units ( 1 ; 2 ) and at least one of the structural units ( 1 ; 2 ) - windings ( 1.1 ; 2.1 ), - a laminated core ( 1.2 ; 2.2 ) and - a holder ( 1.31 ; 2.31 ), wherein - the windings ( 1.1 ; 2.1 ) on the laminated core ( 1.2 ; 2.2 ) are arranged, and - the laminated core ( 1.2 ; 2.2 ) several individual sheets ( 1.21 . 1.22 ; 2.21 . 2.22 ) and on the holder ( 1.31 ; 2.31 ) is mounted, characterized in that a single sheet ( 1.21 ; 2.21 ) is made of a first material and other individual sheets ( 1.22 ; 2.22 ) of the laminated core ( 1.2 ; 2.2 ) of a second material, wherein the single sheet ( 1.21 ; 2.21 ) from the first material the holder ( 1.31 ; 2.31 ) touched. Resolver according to claim 1, characterized in that the single sheet ( 1.21 ; 2.21 ), which the holder ( 1.31 ; 2.31 ) is made of a mechanically softer material than the individual sheets ( 1.22 ; 2.22 ) of the laminated core ( 1.2 ; 2.2 ), which the holder ( 1.31 ; 2.31 ) do not touch. Resolver according to claim 1 or 2, characterized in that the single sheet ( 1.21 ; 2.21 ), which the holder ( 1.31 ; 2.31 ) is made of copper or an alloy containing more than 50% by weight of copper. Resolver according to one of the preceding claims, characterized in that the single sheet ( 1.21 ; 2.21 ), which the holder ( 1.31 ; 2.31 ) touched has a greater thickness than the individual sheets ( 1.22 ; 2.22 ) of the laminated core ( 1.2 ; 2.2 ), which the holder ( 1.31 ; 2.31 ) do not touch. Resolver according to one of the preceding claims, characterized in that consisting of different materials individual sheets ( 1.21 . 1.22 ; 2.21 . 2.22 ) of the laminated core ( 1.2 ; 2.2 ) have a same geometric contour. Resolver according to one of the preceding claims, characterized in that the single sheet ( 1.21 ; 2.21 ), which is made of the first material touches the holder under radial mechanical stress. Resolver according to one of the preceding claims, characterized in that the laminated core ( 1.2 ; 2.2 ) is stanzpaketiert. Method for producing a resolver, comprising two assemblies which can be rotated about an axis (A) ( 1 ; 2 ), wherein for the production of at least one of the structural units ( 1 ; 2 ) the following steps are carried out: - providing (S1) a first sheet of a first material - providing (S2) a second sheet of a second material - separating (S3) of individual sheets ( 1.21 . 1.22 ; 2.21 . 2.22 ) from the first and the second sheet - joining (S4) of the individual sheets ( 1.21 . 1.22 ; 2.21 . 2.22 ) of the first material and the second material to a laminated core ( 1.2 ; 2.2 ) - application (S5) of windings ( 1.1 ; 2.1 ) on the laminated core ( 1.2 ; 2.2 ), - mounting (S6) of the laminated core ( 1.2 ; 2.2 ) to a holder ( 1.31 ; 2.31 ) in such a way that the single sheet ( 1 .21; 2.21) from the first material the holder ( 1.31 ; 2.31 ) touched. A method of making a resolver according to Claim 8, wherein the first sheet is thicker than the second sheet. Process for the production of a resolver according to claim 8 or 9, wherein the separation (S3) of the individual sheets ( 1.21 . 1.22 ; 2.21 . 2.22 ) is made from the first and the second sheet with a punching process. A process for producing a resolver according to any one of claims 8 to 10, wherein the individual sheets ( 1.22 ; 2.22 ) of the second material have the same contour as the individual sheets ( 1.21 ; 2.21 ) from the first material. Process for producing a resolver according to one of claims 8 to 11, wherein for the separation (S3) of the individual sheets ( 1.21 . 1.22 ; 2.21 . 2.22 ) of different materials a contour-identical punching tool is used. A process for producing a resolver according to any one of claims 8 to 12, wherein the individual sheets ( 1.21 . 1.22 ; 2.21 . 2.22 ) by means of a punching packetization method to a laminated core ( 1.2 ; 2.2 ) (S4). A method for producing a resolver according to any one of claims 8 to 13, wherein when mounting (S6) the laminated core ( 1.2 ; 2.2 ) to a holder ( 1.31 ; 2.31 ) the laminated core ( 1.2 ; 2.2 ) is moved axially, wherein the contact between the holder ( 1.31 ; 2.31 ) and single sheet ( 1.21 ; 2.21 ) from the first material the laminated core ( 1.2 ; 2.2 ) is centered.