Linearaktor

Abstract

linear actuator, comprising stator and rotor (4), wherein the rotor (4) comprises magnets whose magnetization direction is aligned substantially in the axial direction, wherein a helix angle is provided, wherein the stator comprises at least one module (20), wherein each module (20) comprises a winding (7) applied to a coil body (6), with which an essentially axially directed magnetic field can be generated, in particular in the region of the magnets, wherein the stator comprises a continuously cast profile (2) which comprises recesses (5) for the passage of cooling medium, wherein the outer or inner surface of the continuous cast profile (2) together with the coil body (6) is shaped in such a way that axially extending cavities are formed, in particular for the passage of lines (1), wherein the coil body (6) is made of steel and has circumferentially extending recesses (41) into which the stator winding wires and / or respective partial windings are inserted, characterized in that the axially adjacent partial windings provided in a respective recess (41) are spaced from one another by means of the coil body (6), wherein a lance (3) is provided in the continuous casting profile (2) for passing a medium through the stator to a downstream device.

Description

The invention relates to a linear actuator.From DE 100 62 823 A1, a voice coil motor is known as an electric cylinder. In this case, this motor, which is designed as a synchronous linear actuator, has a winding which can be supplied with three-phase current.U.S. Pat. No. 6,870,287 B2 discloses a coil part of a linear motor.A linear motor is known from EP 1 300 932 A2.DE 86 14 673 U1 discloses a linear unit for handling devices.The invention is therefore based on the object of developing a linear actuator, wherein linear drive function is to be able to be generated in a cost-effective mannerAccording to the invention, the object is achieved in the linear actuator according to the features specified in claim 1.Essential features of the invention in the case of the linear actuator are that the linear actuator comprises a stator and a rotor, wherein the rotor comprises magnets, the magnetization direction of which is aligned substantially in the axial direction, wherein an inclination angle is provided, wherein the stator comprises at least one module, wherein each module comprises a winding applied to a coil body, with which winding a magnetic field which is directed substantially axially can be generated, in particular in the region of the magnets, wherein the stator comprises an extrusion profile which comprises recesses for passing through cooling medium, wherein the outer surface of the extrusion profile is shaped together with the coil body in such a way that axially extending cavities are formed, in particular for passing through lines.It is advantageous here that lines can be carried out by means of the cavities which can be formed cost-effectively by mere shaping, for example for supplying or for passing through sensor signals to subsequent modules. However, even in continuous casting itself, by using the continuous casting profile, recesses for passing through the cooling medium, such as water, oil, liquid nitrogen or air, are already conceivable in a cost-effective manner. A post-processing is not necessary. Flanges attached on the end sides are provided with connection devices for the introduction or removal of the cooling medium, electrical supply lines, sensor signal lines and a lance according to the invention. When using air, it is even possible to allow the air to flow through in the same axial direction in all the recesses and thus to save devices for the recesses that close at one end face.It is furthermore advantageous that the guiding of a lance for supplying the process, for example with air, is thus made possible in the center of the continuous casting profile.The actuator can be provided as an internal rotor or external rotor.By means of the number of modules, the switching on or switching off of modules, the running length, i.e. stroke, power and force, can be adapted to the respective requirements. The modules are designed in such a way that the lines of the axially following modules can be passed through and the cooling medium can likewise be passed through. In addition, the magnets can be dimensioned in such a way that a high feed force can be generated with them.Furthermore, in the invention, power, force and / or travel path can be generated cost-effectively.In addition, the modules can be designed to be connectable or disconnectable depending on the position of the rotor. It is advantageous here that the heat generation is reduced and thus there is less cooling requirement and less energy consumption.In an advantageous embodiment, the magnets are permanent magnets. It is advantageous here that high forces can be generated.In an advantageous embodiment, the magnets are arranged one behind the other in the circumferential direction, in particular on the inner surface of the hollow rotor. It is advantageous here that the actuator can be realized as an external rotor.In an advantageous embodiment, the continuous casting profile is connected to the coil body on the inner surface thereof, in particular in a force-fit, materially bonded and / or positively bonded manner. It is advantageous in this case that a connection which is sufficiently rigid for transmitting the force can be provided in a cost-effective manner.In an advantageous embodiment, a lance for conducting a medium through to a downstream device is provided in the continuous casting profile. It is advantageous here that a harder material than the material for continuous casting is provided. For continuous casting, aluminum, for example, is provided, and for the lance, steel, for example. For the transmission of force, the rotor flange can be rigidly connected to the flange of the load.In an advantageous embodiment, the linear actuator is designed as a polyphase and / or multipolar alternating coil motor, in particular with a substantially constant force over the running length, in particular as a synchronous motor. It is advantageous here that the actuator can be supplied with three-phase current and / or can be supplied from a converter. In this way, the stroke and speed can be controlled as desired depending on the voltage fed in by the converter and its frequency.In an advantageous embodiment, a flange is provided on the end face of the rotor for transmitting force to the load. It is advantageous here that a linear bearing can be connected to the flange, the movable part of which can be connected to the rotor. In this way, the actuator can be realized with bearings.In an advantageous embodiment, the magnets are manufactured from a plurality of pieces arranged one behind the other in the axial direction, which are arranged with a respective offset relative to one another in the circumferential direction. This has the advantage that a reduction in pole latching is made possible.In an advantageous embodiment, the skew angle is zero or has a value between zero and 30°. It is advantageous here that the skew angle can be optimally adapted and thus the reduction of the pole cogging can be optimally performed.In an advantageous embodiment, the modules are arranged one behind the other in the axial direction and / or are connected to one another in a force-fit and / or form-fit manner. It is advantageous here that a modular construction enables the running path, i.e. stroke, force and / or power, adapted for the respective application, such as machine or installation. For this purpose, modules are stored in the store and a modular unit with high variance and a small number of parts is thus produced.In an advantageous embodiment, the magnets are jointly designed as hollow cylinders made of magnetizable material, which is correspondingly magnetized. It is advantageous here that the production can be carried out quickly and with little outlay and therefore cost-effectively.In an advantageous embodiment, the recesses of the continuous casting profile are produced during continuous casting. It is advantageous here that no post-processing is necessary.In an advantageous embodiment, the coil body is formed on its inner side as an inner cylinder. It is advantageous here that, on the one hand, the extruded profile defines the shape of the cavities by means of its outer contour after its introduction or pressing into the coil body and, on the other hand, the inner cylinder of the coil body. Smooth cavities can thus be produced in which the lines are not exposed to any risk of injury.In an advantageous embodiment, the cavities and recesses extend over the axial length of the continuous casting profile, in particular at least also over the axial length of the stator. It is advantageous here that modules which are far away can also be supplied and that production is simple and cost-effective. In addition, the modular construction can be provided simply and cost-effectively.In an advantageous embodiment, the actuator has an interface for connecting a transport securing means. It is advantageous here that damage can be avoided despite the absence of a bearing of the rotor with respect to the stator, since the transport securing means keeps the rotor and the stator at a defined distance from one another.Further advantages are evident from the dependent claims.The invention will now be explained in more detail with reference to the drawings:FIG. 1 shows a sectional view of a device according to the invention.FIG. 2 shows an oblique view of the rotor and of the stator.FIG. 3 additionally shows a linear bearing for mounting the rotor.In this case, magnetic disks are provided on the inside of the hollow rotor ( 4), the magnetization direction of which is provided in the axial direction.The stator has a winding comprising the partial windings 7, which is provided wound around a coil body 6. The coil body is hollow and has an inner cylinder wall, on which it is connected to an extruded profile 2 in a force-fitting and / or materially integral manner.This continuous casting profile 2 has recesses 5, into which a cooling medium, such as air and / or water, can be conducted in order to transport away the heat from the windings.The continuous casting profile 2 is hollow and has an inner cylinder wall, on which it can be connected in a force-fitting and / or materially integral manner to a lance 3, which is provided for the passage of air, for example, to a downstream device. For the transmission of force, the rotor flange is rigidly connected to the load to be moved.The extruded profile 2 has depressions running in the axial direction on its outer surface, which depressions form cavities with the inner surface of the coil body 6. Cables can be passed through these cavities.In Fig. 1, 5 conduits are shown in a cavity. The three further cavities are likewise suitable for cable feedthrough. The lines can be inserted individually or as cables. Preferably, three three-phase lines, one ground line and one sensor line are carried out in a cavity.In this way, the entire stator can be constructed from more than one module 20, wherein the modules are joined together in the axial direction. Each module 20 has a winding which can be supplied with three-phase current and which generates a substantially axially directed magnetic field, and a sensor which is provided for determining or monitoring the temperature of the respective winding. Each module thus comprises a plurality of partial windings 7.The supply lines and sensor lines of a respective module can be conducted through the cavity of the axially adjacent preceding module.In the embodiment according to FIG. 1, four further modules arranged axially one behind the other can be supplied from the first module, the lines of which are led directly to the outside.FIG. 2 shows an exemplary embodiment with three modules 20.In further embodiments according to the invention, the number of cavities is greater than four or less than four.FIG. 3 shows a further exemplary embodiment according to the invention, in which an exemplary linear bearing of the rotor 4 is provided. The runner 4 is connected to the connecting piece 31, which is detachably connected to the travel carriage 33. This travel carriage 33 is linearly movable on a rail 32. The travel carriage can be implemented with linear bearings, for example also as a slide bearing or as a bearing comprising rolling bodies.The coil body 6 is manufactured in one piece, preferably from steel. In particular, annular grooves for receiving the windings 7 are milled out on the coil body, which are regularly spaced apart from one another in the axial direction. The windings 7 are, as it were, shaped like an ananas disk and are surrounded radially inward and on both sides in the axial direction by steel.FIG. 4 shows the coil body 6 in cross section, showing depressions 41 for inserting the stator winding wires. These depressions extend in the circumferential direction of the coil body. In a further exemplary embodiment according to the invention, the depressions run spirally on the outer circumference of the coil body 6 in the axial direction.The linear actuator according to the invention is therefore preferably embodied with iron.In addition, due to the almost complete surrounding of the partial windings, by inserting these into depressions of the coil body 6, which is preferably manufactured in one piece from steel or iron, very good magnetic guidance of the magnetic field lines is achieved. In addition, the iron is directly connected to the cavities through which flow takes place, i.e. cooling lines, on its inner surface and thus heat dissipation is improved. The stator winding is thus formed overall from partial windings 7, each of which can be provided in a respective annular groove of the coil body 6. Thus, the bobbin 6 contributes to stabilization.In further exemplary embodiments according to the invention, the magnetization direction has an inclination angle of 0 to 30°. In this case, the larger component of the magnetization direction vector is oriented in the axial direction and the smaller component is oriented in the circumferential direction, that is to say tangentially to the imaginary circle on which the magnet is arranged. In this way, the pole latching can be reduced. Instead of an inclination angle, a multi-piece design of the respective magnet is also conceivable, wherein each piece has a magnetization direction in the axial direction and the pieces are arranged one behind the other in the axial direction but with an offset in the circumferential direction present with respect to the respective neighbor. In further embodiments according to the invention, the magnetization direction of the pieces also has a non-disappearing skew angle.In further embodiments according to the invention, a hollow cylinder made of magnetizable material is provided, which instead of the magnets is connected to the rotor and is magnetized accordingly. Thus, simpler production can be realized.In further embodiments according to the invention, a number n of pole pairs of magnetic disks are provided on the inside of the hollow rotor (4), the number n being selected depending on the force required.List of reference characters1 Lines, comprising three-phase lines and sensor lines 2 extrusion profile 3 lance 4 rotor 5 recess for cooling medium 6 coil body 7 winding 8 magnetic plate 9 cavity for lines 20 module 31 connecting piece 32 rail 33 travel carriage 41 depression

Claims

Linear actuator comprising a stator and a rotor (4), wherein the rotor (4) comprises magnets, the magnetization direction of which is aligned substantially in the axial direction, wherein an inclination angle is provided, wherein the stator comprises at least one module (20), wherein each module (20) comprises a winding (7) applied to a coil body (6), with which winding a substantially axially directed magnetic field can be generated, in particular in the region of the magnets, wherein the stator comprises an extrusion profile (2) which comprises recesses (5) for the passage of cooling medium, wherein the outer or inner surface of the extrusion profile (2) is shaped together with the coil body (6) in such a way that axially extending cavities are formed, in particular for the passage of lines (1), wherein the coil body (6) is made of steel and has depressions (41) running in the circumferential direction, Stator winding wires and / or respective partial windings being inserted into the coil former (6), characterized in that the partial windings axially adjacent to one another provided in a respective depression (41) are spaced apart from one another by means of the coil former (6), wherein a lance (3) for passing a medium through the stator to a downstream device is provided in the extruded profile (2).Linear actuator according to Claim 1, characterized in that the magnets are permanent magnets.Linear actuator according to at least one of the preceding claims, characterized in that the magnets are arranged one behind the other in the circumferential direction, in particular on the inner surface of the hollow rotor (4).Linear actuator according to at least one of the preceding claims, characterized in that the continuous casting profile (2) is connected to the coil body (6) on the inner surface thereof, in particular in a force-fit, materially bonded and / or positively locking manner.Linear actuator according to at least one of the preceding claims, characterized in that the linear actuator is designed as a polyphase and / or multipolar alternating coil motor, in particular as a synchronous motor.Linear actuator according to at least one of the preceding claims, characterized in that a flange is provided on the end face of the rotor (4) for transmitting force to the load.Linear actuator according to at least one of the preceding claims, characterized in that the magnets are manufactured from a plurality of pieces arranged one behind the other in the axial direction, which are arranged with a respective offset relative to one another in the circumferential direction, in particular for reducing pole latching.Linear actuator according to at least one of the preceding claims, characterized in that the skew angle is zero or has a value between zero and 30°.Linear actuator according to at least one of the preceding claims, characterized in that the modules (20) are arranged one behind the other in the axial direction and / or are connected to one another in a sealed and / or force-fit and / or form-fit manner.Linear actuator according to at least one of the preceding claims, characterized in that the magnets are jointly designed as a hollow cylinder made of magnetizable material, which is correspondingly magnetized.Linear actuator according to at least one of the preceding claims, characterized in that the recesses of the continuous casting profile (2) are produced during continuous casting, in particular without subsequent machining.Linear actuator according to at least one of the preceding claims, characterized in that the coil body (6) is formed on its inner side as an inner cylinder.Linear actuator according to at least one of the preceding claims, characterized in that the cavities and recesses (5) extend over the axial length of the continuous casting profile (2), in particular at least also over the axial length of the stator.Linear actuator according to at least one of the preceding claims, characterized in that the linear actuator has an interface for connecting a transport securing means.Linear actuator according to at least one of the preceding claims, characterized in that annular grooves for receiving the windings (7) are formed on the coil body (6), in particular the annular grooves are regularly spaced apart from one another in the axial direction.

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