WO2006108852A1

WO2006108852A1 - Synchronous linear motor making use of the geometrical structure of the secondary part

Info

Publication number: WO2006108852A1
Application number: PCT/EP2006/061546
Authority: WO
Inventors: Maximilian Klaus; Thorsten Rabenschlag; Andreas Rust; Johannes Wollenberg
Original assignee: Siemens Aktiengesellschaft
Priority date: 2005-04-15
Filing date: 2006-04-12
Publication date: 2006-10-19
Also published as: DE102005017501A1

Abstract

The aim of the invention is the enlargement of the field of application of synchronous linear motors. Said aim is achieved by making mechanical use of the geometrical structure of the secondary part of a synchronous motor with excitation arranged to the primary side. For example, the tooth structure can be used for locking with a pin (B). Furthermore the rack-shaped secondary part (S) can also be used for an auxiliary drive, a brake mechanism or a pick-up mechanism.

Description

description

Synchronous linear motor with utilization of the geometric structure of the secondary part

The present invention relates to a synchronous linear motor with a primary part and a rack-shaped, permanent magnet-free secondary part.

In many applications of linear motors there is a need to provide means for self-locking. For this purpose, usually mechanical holding brakes, mechanical Verriege ^¬ lungs or weight compensation mechanisms are used. The costs are comparatively high. In addition, the required installation space is often not available.

In addition, linear motors are often used in machinery or equipment in which the power requirement over the travel is not constant. In principle, linear motors could be designed so that they always supply enough power. This Wür ^¬ de However, an uneconomic solution represent. Therefore, linear motors are dimensioned in certain applications so that the required forces can not be made available at one or more points of the travel. Therefore, then an additional drive is necessary. This complex design of linear motors with an auxiliary drive makes their use often uneconomical, or it is the desired use of linear motors due to pointy high power requirements not possible.

Linear regulators are typically used to control linear motors. These linear scales are tapped optically, magnetically or inductively. The cost of obtaining a position signal in this way are comparatively high, a more favorable for the control installation space is not partially available and the robustness of the linear ^¬ maßstäbe is partially insufficient. In addition, the Expenses for assembly and encapsulation of linear scales over charge be high.

The object of the present invention is to increase the field of application of synchronous linear motors.

According to the invention this object is achieved by a Syn ^¬ chronlinearmotor with a primary part and a rack-shaped, permanent magnet-free secondary part, and a locking device which is attached to the primary part directly or indirectly, for releasable, mechanical intervention in the secondary part, so that movement of the Synchronline ^¬ armotors can be inhibited or slowed down. Through this constructive Kon ^¬ tion is ensured that the movement of the synchronous can be inhibited or slowed linear motor without a high expenditure of energy. This is especially important for vertical drives.

The invention is based on the idea to mechanically use the geometric structure of the permanent magnetless reaction part or secondary part of the synchronous linear motor for operation.

Preferably, the locking device has a (pin-shaped) latch for engagement between the teeth of the secondary part. This can be achieved in a relatively favorable manner that the linear motor is locked in a desired position without energy consumption in the direction of movement.

In an alternative embodiment, the locking means may comprise a rotatably mounted gear meshing with the secondary part in engagement, and a member ren or Blockie ^¬ brakes have the gear. This can be ren realisie ^¬ a cost-braking or blocking device. The inventive concept can also be realized by a synchronous linear motor with a primary part and a rack-shaped, permanent magnet-free secondary part, and an auxiliary drive device which is attached to the primary part or its surrounding structure and which engages mechanically in the secondary part to exert on this an additional force ^¬ . This makes it possible that the synchronous linear motor is provided with a cost-effective additional drive without an additional component must be mounted on the side of the secondary part.

In a preferred embodiment, the auxiliary drive means comprises a rotational drive and thus is exaggerated ^¬ gear, so that directly and additionally exercisable of the primary part of the gear motor to the secondary part is ^¬ bar. In this case, the rotary drive can be realized inexpensively by a conventional electric motor.

A further form of realization of the invention consists in a synchronous linear motor with a primary part and a toothed rack genförmigen, permanent magnet-free secondary part, and a transducer device, which is attached to the primary part or its surrounding structure and the samples the secondary part from ^¬, to provide a position signal. Here, too, the secondary part has double functionality, namely the basic magnetic functionality as a reaction part and, moreover, the functionality of a linear scale.

Preferably, the transducer device has a magnetic flux sensor or an optical sensor for detecting the teeth of the secondary part. Both sensors allow contactless ^gripping and are relatively insensitive to contamination.

Furthermore, the encoder device may have a toothed wheel, which engages in the secondary part, and a sensor unit with which a rotation of the toothed wheel can be detected. The gear transmits the movement of the secondary part with respect to the primary part. märteil, which can offer advantages over non-contact scanning systems in particular with regard to contamination.

In addition, the synchronous linear motor according to the invention may have a control device, wherein the position signal serves as a measure of the controlled variable. This allows the movement of the synchronous linear motor to be regulated precisely.

The present invention will now be explained in more detail with reference to the accompanying drawings, in which:

1 shows a section of a synchronous linear motor with a

Lock for blocking;

2 shows a portion of a synchronous linear motor with a gear for clamping and braking;

3 shows a portion of a synchronous linear motor with a rotary auxiliary drive via a gear; and FIG. 4 shows a section of a synchronous linear motor with a standard rotary encoder via a toothed wheel.

The embodiments described in more detail below represent preferred embodiments of the present invention.

According to a first embodiment, a primary part P of a permanent magnetless synchronous linear motor is guided over a secondary part S by means of a machine carriage M. This means that the primary part P moves the machine carriage M linearly over a certain travel path. In FIG. 1, only a short section of the secondary part S, which extends over the entire travel path, is reproduced. Also, only part of the machine carriage M is shown there.

On the machine carriage M and thus also indirectly to the primary part P, a locking unit V is attached. The locking unit V has a locking bolt B, which engages in the extended state in a tooth space of the rack-shaped secondary part, as sketched in FIG is. That is, in the state shown in FIG. 1, the bolt B of the locking unit V blocks a relative movement between the primary part P and the secondary part S or a movement of the machine carriage M. In other words, by activating the locking unit V, the bolt or

Bolt B is pushed toward the reaction part or secondary part S of the engine, whereby a positive connection of the bolt B is achieved with the toothed reaction part of the engine. Since ^¬ by the desired holding forces can be transmitted, oh- ne that energy via the linear motor must be used. Since the reaction part or secondary part S is already required for the Mo ^¬ gate function, created for this part no additional costs nor creates additional space next to the reaction part of the engine. This provides a simple and economical solution for locking the synchronous linear motor.

A second embodiment of the present invention is outlined in principle in FIG. The structure of the synchronous linear motor including the primary part P, secondary part S and Maschi ^¬ nenschlitten M is identical to that of the embodiment of FIG 1. In this embodiment, a gear Z is mounted on the machine carriage M, whose teeth engage in the Se ^¬ kundärteil S. With the linear movement of the primary part P together with the machine carriage M, therefore, the gear Z also rotates. A gear lock ZV, which is also fastened to the machine carriage M, interacts with the gear Z. As required, it brakes or blocks the gear Z, which produces a positive connection with the secondary part S, so that the synchronous linear motor is braked or clamped.

Basically, it is irrelevant in the context of this invention, whether the primary part, etc. or the secondary part S is moved.

A third embodiment of the present invention is shown schematically in FIG. Again, the prinzipiel ^¬ len elements of the synchronous linear motor, namely the primary märteil P, the machine carriage M and the secondary part S with those of the preceding embodiments identical. However, the synchronous linear motor of this third embodiment is equipped with a rotary auxiliary drive. For this purpose, an electric motor E, which drives a toothed wheel Z, is fastened to the machine carriage M. This gear Z is in engagement with the teeth of the secondary S, as in the second embodiment.

The tooth-shaped structure of the reaction part or secondary ^¬ part S can be used here as a reaction rail (rack) for the auxiliary drive. The costs and the Platzbe ^¬ may therefore be omitted for a separate rack. In addition, devices or systems which are indeed useful in principle be equipped with a linear motor, in which linear motors but so far for power reasons were not used to be equipped by this type of drive with linear motors. Due to the combination of linear motor and auxiliary drive, the powertrain can possibly be realized more cost-effectively. A small linear drive together with a conventional rotary drive may be cheaper than a large linear drive.

4 shows a fourth embodiment of the present invention. The synchronous linear motor is equipped with a standard rotary encoder. The synchronous linear motor again corresponds to that of the preceding embodiments. On the machine carriage M here a donor G is attached. It is actuated by a toothed wheel Z, which engages with the teeth of the secondary part S. The rotary encoder G can provide incremental or absolute position information. It can be ^{ausgestal ¬} tet, for example, as a resolver or the like. With the help of the local and / or speed-dependent signals of this rotary encoder G, the linear motor can be controlled and / or its pole position can be detected. This Anord ^¬ voltage provides a robust and length-independent solution that is cost effective, particularly with long axes. The above-described embodiments have in common that they use the toothed surface of the secondary part S in two respects. So not only an electromagnetic but also a mechanical use of this component. On the mechanical side, the secondary part S may be, for Verrie ^¬ rules, for braking, be used for an auxiliary drive and as a linear measure ^¬ stab. These mechanical functions can be combined in any groups.

Advantages of this synchronous linear motor according to the invention erge ^¬ ben in particular in the following areas: elevators, conveyor systems, loading and unloading, assembly systems, NEN Maschi ^¬ or systems with linear drive and point-focused high power ^¬ needs and general automation (machine tools, production machines).

Claims

claims

1. synchronous linear motor with

- a primary part (P) and - a rack-shaped, permanent magnet-free secondary part (S), e e n c e e n e s through

- A locking device (V, ZV), which is attached to the primary part (P) directly or indirectly, for releasable, mechanical intervention in the secondary part (S), so that a movement of the synchronous linear motor can be inhibited or ge ^¬ brakes.

2. Synchronous linear motor according to claim 1, wherein the locking device (V) has a latch (B) for engagement between the teeth of the secondary part (S).

3. synchronous linear motor according to claim 1 or 2, wherein the locking device comprises a rotatably mounted gear (Z), which is in engagement with the secondary part (S), and a blocking ^¬ element (ZV) for blocking or braking of the gear.

4. synchronous linear motor with - a primary part (P) and

- a ratchet-shaped, permanent magnet-free secondary part (S), e e n c e n e s t e c h e e t

- An additional drive means (E), which is fixed to the primary part (P) and in the secondary part (S) mecha ^¬ nically engages to exert on this an additional force.

5. synchronous linear motor according to claim 4, wherein the additional drive means (E) has a rotary drive and a gear (Z) driven therewith, so that from the primary ^¬ part (P) directly and additionally from the gear (Z) force on the secondary part (S ) is exercisable.

6. synchronous linear motor with

- a primary part (P) and

- A transducer device (G) which is attached to the primary part (P) directly or indirectly and which scans the secondary part (S) to provide a position signal.

7. synchronous linear motor according to claim 6, wherein the encoder means (G) comprises a gear (Z) which engages in the secondary part (S), and a sensor unit, with which a rotation of the toothed wheel (Z) can be detected comprises.

8. synchronous linear motor according to claim 6 or 7, which has a control device, wherein the position signal serves as a measure of the controlled variable.

9. synchronous linear motor according to one of claims 1 to 3, comprising an auxiliary drive device (E) according to claim 4 and / or a transducer device (G) according to claim 6.