Position measurement device

Abstract

The invention relates to a position measuring device, comprising a housing for accommodating a scanning device, wherein the scanning device comprises a stator and a rotor, and a rotary flange provided with a connecting shaft, wherein the connecting shaft is rotatably supported in the rotary flange about a rotary axis by means of a bearing, wherein the housing has a through-going bolt hole and an accommodation opening, wherein the housing can be set in an angular position about the rotary axis of the rotary flange by accommodating the rotary flange into the accommodation opening and by aligning the bolt hole with the rotary flange, and wherein the housing can be fastened to the rotary flange in the set angular position by means of a bolt passing through the bolt hole and abutting against a selected section of the rotary flange.

Description

Technical Field

[0001] This invention relates to a position measuring device. Background Technology

[0002] The type of measuring device mentioned earlier is used to detect information in a drive unit. One type of drive unit is a synchronous motor, which typically includes pole wheels. Therefore, information about the position of the pole wheels is needed, for example, to operate the synchronous motor by means of a frequency converter. For this purpose, a position measuring device is connected to the synchronous motor to detect and output the position information.

[0003] Another type of drive device is a servo motor. The servo motor requires the ability to accommodate centering and clamping mechanisms for the position measuring device, as well as the feasibility of rotating the device relative to its position.

[0004] One drawback of the prior art is that multiple components of a known position measuring device must be disassembled in order to enable the position measuring device to rotate relative to the drive device at a specific angular position. Summary of the Invention

[0005] Therefore, the objective of this invention is to create a position measuring device that can be rotated around the object to be measured in a simple manner and method without having to disassemble the position measuring device.

[0006] According to the present invention, the objective is achieved by a position measuring device according to the present invention.

[0007] The position measuring device includes a scanning device and a housing for accommodating the scanning device. For example, the scanning device may include a stator and a rotor housed within the housing.

[0008] Furthermore, the position measuring device includes a rotating flange with a connecting shaft, wherein the connecting shaft is rotatably supported in the rotating flange about a rotation axis by means of bearings. The connecting shaft is used to connect the position measuring device to the object to be measured, such as, for example, to a drive unit. The drive unit may involve a synchronous motor, a servo motor, or an electric motor.

[0009] The housing has at least one through bolt hole and a receiving opening. The housing can be positioned in an angular position about the axis of rotation of the rotating flange by receiving the rotating flange into the receiving opening and by aligning the bolt hole with the rotating flange. The angular position is a rotational position about the axis of rotation.

[0010] In the set angular position, the housing can be fastened to the swivel flange by means of a bolt that passes through the bolt hole and abuts against a selected section stop of the swivel flange.

[0011] Therefore, the housing of the position measuring device according to the invention can be rotated without having to be opened. Only the latch needs to be loosened to allow for position offset. This simplifies the use of the position measuring device and improves efficiency during upcoming maintenance procedures that require rotating the housing of the position measuring device at a specific angular position.

[0012] The solution according to the invention can be further improved by different design schemes, each of which is advantageous in itself and can be arbitrarily combined with each other. The design schemes and their associated advantages are discussed below.

[0013] According to a first feasible design, the rotary flange has at least one locating groove, wherein the housing is positioned in an angular position about the axis of rotation of the rotary flange by means of a bolt passing through the bolt hole and abutting against a selected section of the locating groove, and wherein the housing is secured to the rotary flange in the angular position by means of a bolt passing through the bolt hole and abutting against a selected section of the locating groove. The locating groove in the rotary flange can be designed as at least one opening for a specific location, an elongated hole, a circumferential groove, or an annular groove. By forming a locating groove in the rotary flange, the reliability of the housing being secured to the rotary flange is improved.

[0014] Advantageously, the housing has a positioning flange and a cover for covering the scanning device disposed between the cover and the positioning flange, wherein the positioning flange together with the cover can be positioned in an angular position about the axis of rotation of the rotating flange. This enables reliable fastening of the scanning device while it is fully covered by the cover.

[0015] In an advantageous design, the locating flange has bolt holes. This allows for simple rotation of the position measuring device without disassembling the housing.

[0016] According to another feasible design, the scanning device is secured to a locating flange by means of an eccentric disc, wherein the locating flange has threaded blind holes for locking the eccentric disc by means of screws inserted into the threaded blind holes. This ensures that when the housing rotates, the scanning device also rotates precisely with respect to the rotating flange.

[0017] Advantageously, the scanning device has a rotor and a stator, the stator having stator slots for partially accommodating an eccentric disk. This allows only the stator of the scanning device to deflect as the housing rotates. It is thus possible to rotate the stator relative to the rotor and set the position of the pole wheel of the position measuring device according to the drive to be measured; this is generally referred to as commutation. This is particularly advantageous for scanning devices configured as resolvers or magnetic rotary encoders, and for drive devices configured as servo drives.

[0018] According to another feasible design approach, the positioning groove is configured as a circumferential groove or an annular groove. This enables reliable and stepless housing positioning at any angular position along the circumference of the rotating flange.

[0019] According to an advantageous design, the bolt hole is configured as a through-hole. This allows for a precise hole geometry, into which the bolt fits with exceptional precision, thereby improving the setting and tightening quality during housing rotation.

[0020] In an advantageous design, the bolt is formed as a stud. Bolts typically have radial clearance, so they can be reliably inserted into the stud hole or a through-hole, but can be easily disassembled for housing angle settings.

[0021] Advantageously, the connecting shaft is rotatably supported in a rotating flange by means of bearings and additional bearings. This allows for mechanical redundancy in the position measuring device, which improves the operational reliability of the position measuring device.

[0022] The invention is described in detail below with reference to the accompanying drawings. The combinations of features exemplarily shown in the illustrated embodiments can be supplemented by other features to correspond to the characteristics necessary for a particular application of the measuring device according to the invention, based on the above embodiments. Similarly, according to the above embodiments, individual features in the described embodiments may be omitted if their function is not important in a particular application. In the drawings, the same reference numerals are always used for elements with the same function and / or the same construction. Attached Figure Description

[0023] The attached diagram shows:

[0024] Figure 1 A cross-sectional view of the position measuring device according to the invention is shown in assembled form. Detailed Implementation

[0025] The following reference Figure 1 The position measuring device 1 according to the present invention is described.

[0026] Figure 1 A cross-sectional view of an exemplary embodiment of the position measuring device 1 is shown. The position measuring device 1 is configured for detecting and outputting information about the position, velocity, or acceleration of the object to be measured, and is particularly configured for position detection of a drive device such as, for example, an electric motor, a servo motor, or a synchronous motor. Therefore, the position measuring device 1 may, for example but not only, be configured as part of a drive system or as part of the adjustment system of the drive system (not shown).

[0027] The position measuring device 1 includes a housing 2 for accommodating a scanning device 3, wherein the scanning device includes a stator 3a, a rotor 3b, and a cable lead-out portion 3c. The scanning device 3 may be a solver or a magnetic rotary encoder.

[0028] The position measuring device 1 also includes a rotating flange 4. The rotating flange 4 is provided with a connecting shaft 4a and a bearing 4b. By means of the bearing 4b, the connecting shaft 4a is rotatably supported in the rotating flange 4 about the rotation axis X.

[0029] The housing 2 has a through bolt hole 2a and a receiving opening 2b. The housing 2 can be positioned at an angular position P about the rotation axis X of the rotating flange 4 by receiving the rotating flange 4 into the receiving opening 2b and aligning the bolt hole 2a with the rotating flange 4. In the positioned angular position P, the housing 2 can be secured to the rotating flange 4 by means of a bolt 5 that penetrates the bolt hole 2a and abuts against a selected section of the rotating flange 4. Simply loosening the bolt 5 allows the housing 2 to be shifted at the angular position P. This simplifies the use of the position measuring device 1 and improves operational efficiency should, for example, the housing 2 need to be rotated to a specific angular position P during a reversal.

[0030] The rotary flange 4 may have at least one locating groove 4c. The housing 2 can accommodate the rotary flange 4 within the locating groove 4c into the receiving opening 2b. The bolt hole 2a can be aligned and set with a selectable section of the locating groove 4c at an angular position P about the rotation axis X of the rotary flange 4. The housing 2 can be reliably and precisely fastened to the rotary flange 4 at the set angular position P by means of a bolt 5 passing through the bolt hole 2a and abutting against a selected section of the locating groove 4c. The locating groove 4c in the rotary flange may be designed as at least one opening for a specific location, designed as an elongated hole, designed as a circumferential groove, or designed as an annular groove.

[0031] The housing 2 may have a positioning flange 2c and a cover 2d, the cover being used to cover the scanning device 3 disposed between the cover 2d and the positioning flange 2c, such that the positioning flange 2c together with the cover 2d can be positioned at an angular position P about the rotation axis X of the rotating flange 4 by means of the bolt hole 2a and the bolt 5.

[0032] The positioning flange 2c can advantageously be the portion of the housing 2 with the bolt hole 2a. This allows for simple rotation without having to open the housing 2.

[0033] The scanning device 3 can be fastened to the positioning flange 2c by means of the eccentric disk 10. For this purpose, the positioning flange 2c has a threaded blind hole 11, which is used to lock the eccentric disk 10 by means of a screw 10a introduced into the threaded blind hole 11.

[0034] Advantageously, the stator 3a has stator slots 12 for accommodating the eccentric disk 10. This causes the stator 3a to deflect relative to the rotor 3b of the scanning device as the housing 2 rotates, according to the scanning principle. It is thus possible to set the position of the pole wheel of the measuring device 1 according to the position of the drive device (not shown) to be measured, which is generally referred to as commutation. This is particularly advantageous when the scanning device 3 is configured as a solver or a magnetic rotary encoder, and the drive device (not shown) to be measured is configured as a servo drive.

[0035] The positioning groove 4c can be configured as an annular groove or a circumferential groove. The bolt hole 2a can be configured as a through drill hole 2e or as a threaded pin receiving part. The bolt 5 can be configured as a bolt or a threaded pin.

[0036] The annular groove 4c set in the rotary flange 4, together with the corresponding threaded pin receiving part 2a and threaded pin 5, yields the advantageous feasibility of reversing the solver 3 into a servo motor (not shown).

[0037] The connecting shaft 4a can be rotatably supported in the rotating flange 4 by means of bearing 4b and additional bearing 13. Advantageously, in addition to bearings 4b and 13, a bearing sealing ring 9 is also provided between the rotating flange 4 and the connecting shaft 4a.

[0038] In one design, the connecting shaft 4a may have a screw 16, which simplifies the connection with the object to be measured (not shown). The screw 16 may have a free end 17 and may be disposed in the connecting shaft 4a such that the free end 17 can be used to simply fasten the position measuring device 1 to the object to be measured.

[0039] To seal the housing 2 and protect the scanning device 3, the positioning flange 2c may have a first O-ring 7 at the interface with the cover 2d, which is accommodated in an additional annular groove. This seals the overlapping area between the cover 2d and the positioning flange 2c.

[0040] In addition, the inner wall of the positioning flange 2c forming the receiving opening 2b can also have an inner circumferential groove, in which a second O-ring 8 is provided, and the second O-ring seals the overlapping area between the rotating flange 4 and the receiving opening 2b of the positioning flange 2c.

[0041] The housing 2 may advantageously have a screw cover 15, by which the connecting shaft 4a and the screw 16 are protected and locked within the area of ​​the cover 2d. The screw cover 15 is locked in the housing 2 by a screw cap 6. This ensures that no moisture or dirt can reach the drive shaft 4a, and that the drive shaft 4a, together with the screw 16, is insensitive to changes in speed relative to the object being measured.

Claims

1. A position measuring device (1), the position measuring device comprising: - A housing (2) for accommodating the scanning device (3), and - A rotating flange (4) is provided with a connecting shaft (4a), wherein the connecting shaft (4a) is rotatably supported in the rotating flange (4) about a rotation axis (X) by means of a bearing (4b). - The housing (2) therein has a through bolt hole (2a) and a receiving opening (2b). - The housing (2) is positioned at an angular position (P) about the axis of rotation (X) of the rotating flange (4) by accommodating the rotating flange (4) into the accommodating opening (2b) and by aligning the bolt hole (2a) with the rotating flange (4). - wherein the housing (2) can be fastened to the rotating flange (4) in a set angular position (P) by means of a bolt (5) passing through the bolt hole (2a) and abutting against a selected section stop of the rotating flange (4), The housing (2) has a positioning flange (2c), the scanning device (3) is fastened in the positioning flange (2c) by means of an eccentric disk (10), and the scanning device (3) has a stator (3a) having a stator slot (12) for receiving the eccentric disk (10).

2. The position measuring device (1) according to claim 1, wherein the rotary flange (4) has at least one positioning groove (4c), wherein the housing (2) is configured in an angular position (P) about the axis of rotation (X) of the rotary flange (4) by means of a bolt (5) passing through the bolt hole (2a) and abutting against a selected section of the positioning groove (4c).

3. The position measuring device (1) according to claim 1 or 2, wherein the housing (2) has a cover (2d) for covering the scanning device (3) disposed between the cover (2d) and the positioning flange (2c), wherein the positioning flange (2c) together with the cover (2d) can be set in an angular position (P) about the rotation axis (X) of the rotating flange (4).

4. The position measuring device (1) according to claim 3, wherein the positioning flange (2c) has the bolt hole (2a).

5. The position measuring device (1) according to claim 3, wherein the positioning flange (2c) has a threaded blind hole (11) for locking the eccentric disc (10) by means of a screw (10a) introduced into the threaded blind hole (11).

6. The position measuring device (1) according to claim 4, wherein the positioning flange (2c) has a threaded blind hole (11) for locking the eccentric disc (10) by means of a screw (10a) introduced into the threaded blind hole (11).

7. The position measuring device (1) according to claim 2, wherein the positioning groove (4c) is configured as an annular groove.

8. The position measuring device (1) according to claim 1 or 2, wherein the bolt hole (2a) is configured as a through borehole (2e).

9. The position measuring device (1) according to claim 1 or 2, wherein the bolt (5) is configured as a bolt.

10. The position measuring device (1) according to claim 1 or 2, wherein the connecting shaft (4a) is rotatably supported in the rotating flange (4) by means of the bearing (4b) and an additional bearing (13).

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