Linear drive

Abstract

A linear drive, having a mobile part which is movable along rails (1) and has permanent magnet arrangements (5), in particular wherein the rails (1) are laid on a floor (9), wherein at least one primary part (6) is arranged in a stationary manner with respect to the rails (1) and / or is connected to the rails (1), wherein suspension plates (4) are fastened to the chassis (8) of the mobile part, a permanent magnet arrangement (5) being fastened to the bottom side of each suspension plate, in particular to the side of each suspension plate that faces the floor (9).

Description

[0001] Linear actuator

[0002] Description:

[0003] The invention relates to a linear drive.

[0004] It is generally known that a linear actuator has a mobile part that is movable relative to a stationary part.

[0005] From DE 102006017 033 A1 a placement machine for placing electrical components onto substrates is known.

[0006] The invention is therefore based on the objective of enabling the simple manufacture of a linear drive.

[0007] According to the invention, the problem is solved in the linear drive according to the features specified in claim 1.

[0008] Important features of the invention in the linear drive are that the linear drive has a mobile part movable along rails, which has permanent magnet arrangements, in particular wherein the rails are laid on a floor, wherein at least one primary part is arranged stationary to the rails and / or is connected to the rails, wherein suspension plates are attached to the chassis of the mobile part, on the underside of which, in particular on the side facing the floor, a permanent magnet arrangement is attached.

[0009] A key advantage is that the permanent magnet assembly is very easy to install during the handset manufacturing process. This simply requires arranging mounting plates side-by-side in the handset along the rails. Butt joints are not necessary.

[0010] ISI \ EIDOPAT 16.10.2025 can be advantageously implemented, enabling adjustment in the rail direction. During installation, the mounting plates are vertically adjusted using spacers. This allows for simple assembly and adjustment.

[0011] In a preferred embodiment, the permanent magnet arrangements are spaced apart from each other in the direction of the rail. This offers the advantage of achieving a higher traction force. In particular, the mobile unit can be constructed modularly, for example by using mounting plates of equal length in the direction of the rail and / or permanent magnet arrangements of equal length in the direction of the rail.

[0012] In an advantageous embodiment, a spacer device is arranged between the chassis and the respective mounting plate. The advantage here is that the distance between the permanent magnet assembly and the primary part can be adjusted by means of the spacer device.

[0013] In an advantageous embodiment, the mounting plate has two leg sections connected by a yoke section of the mounting plate, with the respective permanent magnet arrangement attached to the yoke section. A collar section projects from the end of each leg section furthest from the yoke section, in the direction opposite the other leg section. It is advantageous that the mounting plate can be hooked into the chassis at the outwardly projecting collar sections.

[0014] In a preferred embodiment, the collar areas of the respective mounting plate rest on the chassis, in particular on the respective chassis rails. An advantage of this is that simple installation is possible.

[0015] In an advantageous embodiment, the mounting plate, including collar areas, yoke area, and leg areas, is designed as a single-piece stamped and bent component. This design offers the advantage of simple and cost-effective manufacturing.

[0016] In an advantageous embodiment, the spacer device comprises a stack of spacer plates or a single spacer plate. The advantage here is that the distance, in particular the distance between the permanent magnet assembly and the primary part, can be adjusted cost-effectively. In an alternative advantageous embodiment, the spacer device comprises a piezoelectric element or an electric motor. The advantage here is that the distance, in particular the distance between the permanent magnet assembly and the primary part, can be adjusted cost-effectively even during operation, for example, due to thermally induced changes in length. Changes in distance caused by different loads on the mobile unit and by the elasticity of the chassis and wheels can also be compensated for.

[0017] In a preferred embodiment, bearings are mounted on the chassis for the rotatable mounting of a wheel that rolls on one of the rails. It is advantageous that the mobile unit is designed as a rail vehicle.

[0018] In an advantageous embodiment, the permanent magnet arrangements mounted on the handset are spaced apart from one another in the rail direction, in particular uniformly. It is advantageous that the respective primary part engages with the respective permanent magnet arrangements sequentially, and thus only a few primary parts drive many permanent magnet arrangements.

[0019] In an advantageous embodiment, the primary components are spaced apart from each other in the direction of the rail, in particular uniformly. An advantage of this is that the mobile unit can be transported over a long distance.

[0020] In an advantageous embodiment, the respective primary part is arranged on a respective support plate, which is U-shaped or which has two leg sections connected by a yoke area and arranged vertically below the yoke area, in particular wherein the opening of the U is oriented downwards, i.e. towards the ground. An advantage of this is that simple and cost-effective manufacturing is possible.

[0021] In an advantageous embodiment, a profile section is attached to the chassis of the mobile unit, to which a scale is mounted. The scale has alternatingly magnetized permanent magnet sections arranged one behind the other in the direction of the rails. These sections are detectable by a stationary sensor and / or a sensor connected to the rails, particularly when the mobile unit passes the sensor. The primary parts are energized with an alternating current that depends on the signal from the sensor. It is advantageous that the scale allows the position of the mobile unit, and thus also the relative position of the permanent magnet arrangements to the primary part, to be determined. Depending on this determined relative position, the winding of the primary part can be energized with a corresponding alternating current.

[0022] Although the permanent magnet arrangements are intended to generate the traction force and therefore produce a strong magnetic field, according to the invention a physical embodiment with permanent magnet areas is used which are intended for the highly precise determination of the position of the mobile unit.

[0023] In an advantageous embodiment, the profile section is made of a metallic, in particular diamagnetic, material, especially aluminum, particularly as an extruded casting, the drawing direction of which is aligned parallel to the rail direction. An advantage of this is that the detection of the scale can be magnetically shielded by the soft magnetic material, thus preventing interference.

[0024] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0025] The invention will now be explained in more detail with reference to schematic illustrations:

[0026] Figure 1 shows a cross-section of a linear drive according to the invention, which shows a mobile part, in particular a rail vehicle, which can be moved along rails 1 of the linear drive.

[0027] The normal direction of the cross-sectional plane is aligned parallel to the rail direction.

[0028] The two parallel rails 1 of the linear drive extend in the direction of the rails, the mobile unit having a chassis 8 on which wheels 2 are rotatably mounted via bearings, each of which rolls on the respective rails 1.

[0029] The rails 1 are laid on floor 9.

[0030] Support plates 7 are arranged on the base 9, on which electrically energized primary parts 6 are arranged at intervals in the direction of the rail. These comprise windings, so that a magnetic field is generated.

[0031] The distance between two primary parts 6 that are closest to each other in the direction of the rail is smaller than the length of the chassis 8 and / or the mobile part in the direction of the rail.

[0032] The respective support plate 7 is U-shaped, with the opening of the U oriented towards the bottom 9.

[0033] The linear drive has U-shaped mounting plates 4 arranged one behind the other in the direction of the rail. At the ends of the legs of the U facing away from the yoke, laterally projecting collar areas are formed. These collar areas rest on frame members of the vehicle chassis via spacers 3, with the opening of the U facing away from the ground 9. The frame members extend parallel to the direction of the rail. The spacer 3 can be configured as a stack of spacers or as a single spacer. The vertical height of each mounting plate 4 is adjustable by means of the spacer 3.

[0034] A permanent magnet arrangement 5 is attached to the underside of the mounting plate 4, particularly at its lowest point. Preferably, this permanent magnet arrangement 4 is positioned centrally between the legs of the U-shaped mounting plate 4.

[0035] On the support plate 7, the respective primary part 6 is also arranged in a horizontal transverse direction to the rail direction, centrally between the legs of the U-shaped suspension plate 4.

[0036] The primary part 6 has an electrically energizable stator winding, in particular a three-phase winding unwound in the direction of the rail.

[0037] The winding of the primary part 6 is supplied by an inverter or converter, whereby the propulsion in the direction of the rail is generated by means of the interaction of the variable magnetic field generated by the winding 11 with the permanent magnets of the permanent magnet arrangement 4.

[0038] The permanent magnets of the permanent magnet arrangement 4 are arranged one behind the other in the direction of the rail, with each magnetized alternately in the vertical direction.

[0039] The mounting plates 4 have a length a or integer multiples of length a in the rail direction. Preferably, the mounting plates 4 are arranged butt-jointed in the rail direction, i.e., in contact with each other.

[0040] When passing over the respective primary part 6, the permanent magnet arrangement 4 maintains the distance to the primary part 6 set by the spacer device.

[0041] Parallel to the rails, a profile section is attached to the handset, in which a magnetic scale is arranged. The magnetic scale has alternating permanent magnet sections magnetized one after the other in the direction of the rail. A stationary sensor detects these permanent magnet sections as the handset moves past, and the linear position of the handset is determined from the sensor signal.

[0042] The profile section is preferably made of a non-magnetic material, in particular plastic or aluminum. A highly preferred option is the use of an extruded aluminum profile section, the drawing direction of which is aligned parallel to the rail direction. The scale is preferably arranged in a recess of the profile, particularly on the side of the profile section facing away from the permanent magnet arrangement and the primary components. This protects the scale and the sensor from interfering alternating magnetic fields, especially those of the primary component. For this purpose, the profile section maintains a non-zero distance from the mounting plates.

[0043] To determine the absolute position and / or identity of the handset, a second sensor system can be provided, thus increasing the reliability of the position determination, as the position determination can be performed redundantly. This second sensor system does not use a magnetic method, but rather a different physical mode of operation, for example, an optical one.

[0044] In further embodiments of the invention, the distance device is designed as a distance element adjustable by an actuator. The actuator comprises either a piezoelectric element or an electric motor.

[0045] Reference symbol list

[0046] 1 rail 2 wheels

[0047] 3. Spacer device

[0048] 4 mounting plates

[0049] 5 Permanent magnet arrangement

[0050] 6 Primary part 7 Support plate

[0051] 8 chassis

[0052] 9 Floor

Claims

- 9 - Patent claims:

1. Linear drive comprising a mobile unit movable along rails, which has permanent magnet arrangements, in particular wherein the rails are laid on a floor, wherein at least one primary part is arranged stationary to the rails and / or is connected to the rails, characterized in that mounting plates are attached to the chassis of the mobile unit, on the underside of which, in particular on the side facing the floor, a permanent magnet arrangement is attached.

2. Linear drive according to claim 1, characterized in that the permanent magnet arrangements are spaced apart from each other in the rail direction.

3. Linear drive according to one of the preceding claims, characterized in that a respective spacer device is arranged between the chassis and the respective mounting plate.

4. Linear drive according to one of the preceding claims, characterized in that the mounting plate has two leg regions which are connected via a yoke region of the mounting plate, wherein the respective permanent magnet arrangement is attached to the yoke region, wherein a respective collar region projects from the end region of the respective leg region facing away from the yoke section in the direction facing away from the other leg region.

5. Linear drive according to one of the preceding claims, characterized in that the collar areas of the respective mounting plate rest on the chassis, in particular on respective frame members of the chassis.

6. Linear drive according to one of the preceding claims, characterized in that the mounting plate including collar areas, yoke area and leg areas is designed as a particularly one-piece stamped and bent part. - 11 - 7. Linear drive according to one of the preceding claims, characterized in that the distance device comprises a stack of spacer plates or a single spacer plate or that the distance device comprises a piezoelectric element or an electric motor.

8. Linear drive according to one of the preceding claims, characterized in that bearings are mounted on the chassis for the rotatable mounting of a wheel which rolls on one of the rails.

9. Linear drive according to one of the preceding claims, characterized in that the permanent magnet arrangements arranged on the mobile unit are spaced apart from each other in the rail direction, in particular uniformly.

10. Linear drive according to one of the preceding claims, characterized in that the primary parts are spaced apart from each other in the rail direction, in particular uniformly.

11. Linear drive according to one of the preceding claims, characterized in that the respective primary part is arranged on a respective support plate which is U-shaped or which has two leg areas connected to a yoke area, which are arranged in a vertical direction below the yoke area, in particular wherein the opening of the U is oriented downwards, in particular towards the ground. - 12 - 12. Linear drive according to one of the preceding claims, characterized in that a profile part is attached to the chassis of the mobile unit, to which a scale is attached, wherein the scale has alternately magnetized permanent magnet areas arranged one behind the other in the direction of the rail, which can be detected by a stationary sensor and / or a sensor connected to the rails, in particular when the mobile unit passes the sensor, in particular wherein that or the primary parts are supplied with an alternating current dependent on the signal of the sensor.

13. Linear drive according to one of the preceding claims, characterized in that the profile part is made of a metallic, in particular diamagnetic material, in particular aluminium, in particular as an extruded casting, the drawing direction of which is aligned parallel to the rail direction.

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