EP2097568B1 - Ribbon loom having an electrically operated drive - Google Patents

Description

Technical area

The invention relates to a ribbon loom with electrically operated drive, according to the preamble of claim 1.

State of the art

It is customary to use in the weaving electric motors for driving the main shaft, which is used to drive at least one of the components such as reed, weft insertion device, shedding device, fabric take-off and the like.

So it is for example from the CH 633 331 known to drive by means of the main shaft a shedding device, a weft insertion device, a reed and a knitting needle via corresponding gear.

For the drive of a Jacquard machine or a dobby machine has also been proposed to use a direct drive, such as in the EP-A-0 743 383 or later in the WO-A-2006/029993 , As a drive motor for the direct drive, a torque motor was proposed there, which is coupled via a synchronization device with the main shaft, which is driven by an induction motor. A torque motor is characterized by a high torque, but allows only relatively low speeds of 600 U / min and a maximum of about 1000 U / min.

If higher rotational speeds of an electric motor are required, the asynchronous motor is the first choice. However, in this the stall torque is quite small and the asynchronous motor is difficult to control at low speeds, which are required for the establishment of a ribbon loom. For the reasons explained above, neither a torque motor nor an asynchronous motor for driving the main shaft of a ribbon loom is thus optimally usable.

Presentation of the invention

The object of the invention is to provide a ribbon loom with a directly driven main shaft with an improved drive, which in particular does not have the disadvantages of the torque motor or the asynchronous motor.

The object is achieved by a ribbon loom according to claim 1. The measures of the invention initially result in that a motor with a high torque for driving the main shaft of the ribbon loom is used. Although the torque (stall torque) of the proposed engine according to the invention is slightly smaller than that of a conventional torque motor, but - by constructive measures - easily speeds from 2000 to about 10,000 rev / min can be achieved. The drive is particularly advantageous because the quite high torque is almost equal for a design of the engine for virtually all achievable speeds.

Advantageous embodiments of the ribbon loom with a drive by the motor according to the present invention are described in claims 2 to 7.

It is advantageous if the rotor is flanged directly to the main shaft. (Claim 2). This results in a particularly simple and space-saving design, in particular for the engine no separate bearings are required. Structurally, it is particularly advantageous if the rotor permanently excited magnets (claim 3) and the motor includes a printed circuit board, a side plate and a stator plate, wherein the stator is connected via the circuit board with the stator and the latter via spacer elements, preferably via spacer bolts, is mounted on the side plate. (Claim 4).

It is particularly advantageous to use a rotary sensor and an electrical control device. The electrical control device will be advantageously set up so that the rotating electrical field rotates faster in the ratio of the Statorpolzahlen to the magnetic poles. (Claim 5)

An optimally compact design allow the measures of claim 6, when the main shaft is passed through the hollow stator and carries a sensor magnet which cooperates with the rotary sensor, which is arranged opposite the sensor magnet on the circuit board.

It is particularly advantageous if the sensor data of the rotary sensor of the weaving machine are made available, since they are also data relating to the machine position due to the direct drive (claim 7).

The above-mentioned as well as the claimed and described in the following embodiments, according to the invention to be used elements are subject to their size, shape design, material usage and their technical conception no special conditions of exception, so that the well-known in the respective field of application selection criteria can apply without restriction.

Brief description of the drawings

Figur 1

die Darstellung des Antriebs einer Bandwebmaschine gemäss einem bevorzugten Ausführungsbeispiel der vorliegenden Erfindung, von der Seite;

Figur 2

eine Detaildarstellung des Motors gemäss Figur 1; und

Figur 3

eine Schnittdarstellung des Antriebsmotors nach Figur 2.

Embodiments of a ribbon loom with an advantageous direct drive will be described in more detail with reference to the drawings, in which:

FIG. 1

the representation of the drive of a ribbon loom according to a preferred embodiment of the present invention, from the side;

FIG. 2

a detailed representation of the engine according to FIG. 1 ; and

FIG. 3

a sectional view of the drive motor after FIG. 2 ,

Ways to carry out the invention

An embodiment for carrying out the present invention is in the FIGS. 1 to 3 shown. In FIG. 1 a ribbon loom of conventional type is provided with a direct drive for the main shaft 10, wherein the main shaft 10 - in the present embodiment - for driving the cam 36, the weft drive shaft 38, the Wirknadelantriebswelle 40 and also the auxiliary thread drive shaft 42 is used.

The core of the drive according to this embodiment is the in FIG. 2 engine 2 as a whole. This engine 2 is a brushless DC motor in asymmetric multipole design. In this embodiment, an external rotor 4 is flanged directly to the main shaft 10 of the ribbon loom. The rotor 4 consists of a rotor bell 16, the 14 arranged thereon permanent magnets 18 has. The rotor is a fixed stator 20 made of laminated cores with 12 windings 22 opposite. The stator 20 is on the one hand attached to the side plate 14, on the other hand mechanically connected with spacer elements, in the present embodiment with three spacer bolts 30, with a stator 26. Between the stator 20 and the stator 26, a circuit board 24 is also arranged, which carries the necessary electrical components for the electrical supply of the motor 2. In the motor 2 of the present embodiment, all 12 stator teeth are wound to achieve optimum efficiency.

mit M als Zahl der Magnetpole
S als Zahl der Statornuten und
k als natürliche Zahl (k= 1, 2, 3, 4....), hier mit k = 1.As a result of the arrangement as an external rotor, as is generally known in engine technology, the torque is increased by about a factor of 5 (for the embodiment stated here) compared to a corresponding internal rotor. Due to the ratio between the number of permanent magnets in the rotor and the stator windings of 14 to 12 (ie 7 to 6) rotates the rotor bell 7 times slower than the magnetic field and thus the efficiency of the engine is high. Of course, a different ratio between the number of permanent magnets in the rotor and the stator windings can be selected for other requirements and speed or torque ratios, the principle described here is the asymmetric Vielpolausführung that the number of magnetic poles on the number of Statornuten differs, preferably according to the formula $$\mathrm{M}\mathrm{=}\left(\mathrm{S}\mathrm{*}\mathrm{k}\right)\mathrm{+}\mathrm{/}\mathrm{-}\mathrm{2}$$

with M as the number of magnetic poles
S as the number of stator slots and
k as a natural number (k = 1, 2, 3, 4 ....), here with k = 1.

The speed reduction is then 2 / M.

The motor 2 described here requires as a brushless motor (electrically commutated motor) a control device which is housed in the present embodiment on the circuit board 24 and consists essentially of a three-phase bridge (rotary converter). The control is additionally applied to the data of a rotary sensor 32. The rotation sensor 32 is arranged on the printed circuit board 24 and measures the phase position of the main shaft 10 by means of a sensor magnet 34 arranged on the end of the main shaft 10 with respect to the rotary sensor 32. With the aid of the phase position of the main shaft 10 thus measured and thus the rotor bell 16 with respect to the stator 20 is the rotating field both in the electrical commutation (if necessary, instead of a measurement of the induction voltage) as well as during setup in the control device regulated. This avoids the need for the controller to accelerate the rotor to a certain minimum speed, ie in the sense of a rotating field synchronous motor, until a readable induction voltage is available in the stator, with which the controller can execute the regulation. Particularly advantageous in the embodiment described here, however, is that because of the direct mechanical connection between the rotor 4 and the main shaft 10, the data of the rotation sensor can be used not only for the controller, but also for controlling and regulating the ribbon loom itself. <U> REFERENCE LIST </ u> 2 engine 4 rotor 10 main shaft 12 depository 14 side shield 16 rotor bell 18 permanent magnets 20 Stator made of laminated cores 22 windings 24 circuit board 26 stator 28 stator 30 Distance bolts 32 rotation sensor 34 sensor magnet 36 cams 38 Shot drive shaft 40 Knitting needle drive shaft 42 Stitch drive shaft

Claims (7)

1. A ribbon loom, which has a main shaft (10) which is connected to a drive and to which at least one weft insertion needle and at least one reed are drive-connected, characterized in that the drive comprises a brushless direct-current motor (2), designed as an external rotor, with a stator (20), with windings (22) and with a rotor (4) having a rotor bell (16), and the direct-current motor (2) is designed as a motor of the asymmetric multipolar type, the rotor (4) of which is directly connected, without a specific bearing point, to the main shaft (10) of the ribbon loom.
2. The ribbon loom as claimed in claim 1, characterized in that the rotor (4) is flanged directly to the main shaft (10).
3. The ribbon loom as claimed in claim 1 or 2, characterized in that the rotor is designed with permanently excited magnets (18).
4. The ribbon loom as claimed in one of claims 1 to 3, characterized in that the motor (2) has a circuit board (24), a side plate and a stator plate (26), the stator (20) being connected to the stator plate (26) via the circuit board (24), and the stator plate (26) being mounted on the side plate via spacer elements, preferably via spacer bolts (30).
5. The ribbon loom as claimed in one of claims 1 to 4, characterized by a rotary sensor (32) and by an electrical regulating device which is set up such that the electrical rotating field rotates more quickly in the ratio of the number of stator poles to the magnetic poles.
6. The ribbon loom as claimed in claim 5, characterized in that the main shaft (10) is led through the stator (20) of hollow design and carries a sensor magnet (34) which cooperates with the rotary sensor (32) which is arranged, opposite the sensor magnet (34), on the circuit board (24).
7. The ribbon loom as claimed in claim 5 or 6, characterized in that the rotary sensor (32) is set up such that it makes sensor data relating to the machine position of the main shaft (10) available to the ribbon loom.

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