KR20090073168A - Ribbon loom having an electrically operated drive - Google Patents

Abstract

In order to drive the main shaft (10) directly in a ribbon loom and in the process to make both a high standstill torque and high rotational speeds possible, the invention proposes a brushless DC motor (2) which is configured as an external rotor as the drive means. This motor (2) has a stator (20) having windings (22) and a rotor (4) having a rotor bell (16), and is configured as a DC motor having an asymmetrical multi-pole design. Its rotor (4) which is fitted with permanent magnets (18) is connected directly without a dedicated bearing point to the main shaft (10) of the ribbon loom.

Description

RIBBON LOOM HAVING AN ELECTRICALLY OPERATED DRIVE}

The present invention relates to a ribbon loom with an electrically actuated drive according to the preamble of claim 1.

In weaving, it is common to use an electric motor that drives a spindle that acts to drive at least one of the components, such as a lid, weft insertion device, shedding device, fabric remover, and the like.

Thus, for example, it is known from Swiss patent 633,331 to drive a shedding device, a weft insertion device, a lid and a knitting needle with the main shaft via corresponding gears.

For the drive of jacquard machines or dobbys, the use of direct drives has already been proposed, for example in EP-A-0 743,383 or later in WO-A-2006 / 029993. The drive motor presented there for the direct drive is a torque motor connected via a synchronous device to a main shaft driven by an asynchronous motor. Torque motors are characterized by high torque, and it is possible to have only relatively small rotational speeds of up to approximately 1000 revolutions / minute, of 600 revolutions / minute.

If a high rotational speed of the motor is required, the asynchronous motor will seem appropriate in the first place. However, in this case the stopping torque is relatively low, and the asynchronous motor can only be adjusted with difficulty at the low rotational speeds necessary to set up the ribbon loom. For the reasons mentioned above, therefore, neither a torque motor nor an asynchronous motor can be optimally used to drive the main shaft of the ribbon loom.

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

This object is achieved by the ribbon loom of claim 1. In this case, the initial results of the measurement of the present invention are that a high torque electric motor is used to drive the main axis of the ribbon loom. Although the motor torque (stop torque) presented according to the invention is somewhat lower than that of a conventional torque motor, a rotational speed of 2000 to approximately 10,000 revolutions per minute can be easily achieved rather than by structural measurements. When the electric motor is designed for virtually all possible rotational speeds, the drive is particularly advantageous because the very high torque is approximately the same.

Advantageous improvements of a ribbon loom with a drive by means of an electric motor according to the invention are described in claims 2 to 7.

It is advantageous if the rotor is flanged directly to the main shaft (claim 2). This provides a particularly simple and space-saving construction and does not require special bearings for the electric motors in particular. The rotor is permanently excited to magnetism (claim 3) and the motor comprises a circuit board, a side plate and a stator plate, which is particularly advantageous in structural conditions (claim 3). A stator is connected to the stator plate, and the stator plate is mounted to the side plate via spacer elements, preferably spacer bolts (claim 4).

It is particularly advantageous to use rotation sensors and electric regulators. The electrical regulating device is advantageously set in this case such that the electric rotating field rotates more quickly in the ratio of the quantity of stator poles to magnetic poles (claim 5).

The measurements of claim 6 make it possible to have an optimally compact structure when the main axis is placed through a stator of hollow design and carries a sensor magnet which cooperates with a rotation sensor disposed opposite on a circuit board.

When sensor data from the rotation sensor is made available to the loom, it is particularly advantageous because of the direct drive, the data is also relative to the machine position (claim 7).

The elements used by the present invention mentioned above and claimed in the following exemplary embodiments are not affected by other particularly exceptional conditions in their size, configuration, use of sanctions and technical constructions, and therefore in each form of use. The selection criteria known in the paragraph can be adopted without limitation.

Exemplary embodiments of a ribbon loom with advantageous direct drive are described in more detail below in connection with the drawings:

1 shows, from the side, a drive of a ribbon loom according to a preferred exemplary embodiment of the invention,

2 shows details of the electric motor according to FIG. 1,

3 shows a cross section of the drive motor according to FIG. 2.

Reference List

2: electric motor 4: rotor 10: spindle

12: bearing point 14: side plate 16: rotor bell

18: permanent magnet 20: stator consisting of bundles of stacks

22: winding-up part 24: rotating substrate 26: stator plate

28: stator carrier 30: spacer bolt

32: rotation sensor 34: sensor magnet 36: cam disk

38: weft drive shaft 40: knitting needle drive shaft

42: auxiliary screw drive shaft

One exemplary embodiment of practicing the present invention is shown in FIGS. In Fig. 1, a ribbon loom of the conventional type is used to drive the cam disk 36, the weft drive shaft 38, the knitting needle drive shaft 40 and the auxiliary screw drive shaft 42 in this exemplary embodiment. Direct drive for the main shaft 10 is installed.

The essence of the drive according to this exemplary embodiment is the electric motor 2 specified as a whole in FIG. 2. This electric motor 2 is an asynchronous multi-pole type BLDC motor (Brushless DC Motor). In this exemplary embodiment, the outgoing rotor 4 is flanged directly on the main shaft 10 of the ribbon loom.

In this case, the rotor 4 consists of a rotor bell 16 having a permanent magnet 18 disposed thereon. On the opposite side of the rotor, a firm stator 20 is arranged which consists of a bundle of stacks with twelve windings 22. In this case, the stator 20 is fixed to the side plate 14 on the one hand and, on the other hand, by the spacer elements, in this exemplary embodiment by the three spacer bolts 30. Mechanically connected).

In addition, a circuit board 24 is disposed between the stator 20 and the stator plate 26 to carry electrical components necessary for the electric supply of the electric motor 2. In the electric motor 2 of the present exemplary embodiment, all twelve stator teeth are wound to obtain optimum efficiency.

As is basically known in the motor art, the arrangement with the outer rotor increases the torque (in the version specified here) by approximately 5 compared to the corresponding inner rotor. As a ratio between the number of permanent magnets of the rotor and the number of stator windings of 12 to 14 (ie of 6 to 7), the rotor bell rotates seven times slower than the magnetic field, and the efficiency of the motor is consequently high. Of course, if there are different requirements and rotational speed or torque conditions, the ratio of the number of permanent magnets to the number of stator windings of the rotor may be selected differently. In fact, it is preferably based on the following equation.

M = (S * K) +/- 2

M is the number of magnetic poles

S is the number of stator slots

K is a natural number (K = 1,2,3,4, etc.), where K = 1

Thus, the reduction in the rotational speed is 2 / M in this case.

The above-described electric motor 2, which is a brushless motor, is housed on the circuit board 24 in this exemplary embodiment, and is essentially made of a three-phase bridge (rotary converter). It requires an adjusting device to be constructed. Adjustment further acts with data from the rotation sensor 32. The rotation sensor 32 is disposed on the circuit board 24, and at the end of the main shaft 10, the phase position of the main shaft 10 with the aid of the sensor magnet 32 disposed opposite the rotation sensor 32. Measure Thus, with the help of the measured rotor position of the main shaft 10 and the rotor bell 16 with respect to the stator 20, the rotation field is adjusted during both the electrical rectification (instead of the measurement of the induced voltage, if necessary) and during the operation setting. Can be adjusted. The situation in which the control device unintentionally accelerates the rotor, such as a synchronous motor in a rotating field, at a specified minimum rotational speed until a readable induced voltage at which the control device can carry out the adjustment is available is consequently avoided. .

This is particularly advantageous in the present exemplary embodiment described above, but due to the direct mechanical connection of the rotor 4 and the spindle 10, the data from the rotation sensor is not only for the control device, but also for the ribbon loom itself. It can also be used to control and adjust.

Claims (7)

In a ribbon loom having a main shaft (10) connected to a drive device and having at least one weft insertion needle and at least one lead driven therefrom, The drive device comprises a stator 20, a rotor 4 having a rotor bell 16, and a non-commutator direct current motor 2 designed as an outer rotor with windings 22. 2) Ribbon weaving machine, characterized in that the rotor (4) is designed as an asynchronous multi-pole type electric motor directly connected without a special support to the main shaft (10) of the ribbon loom. The method of claim 1, Ribbon rotor, characterized in that the rotor (4) is directly flanged to the main shaft (10). The method according to claim 1 or 2, Ribbon rotor, characterized in that the rotor is designed with permanently excited magnets (18). The method according to any one of claims 1 to 3, The motor 2 includes a circuit board 24, a side plate and a stator plate 26. The stator 20 is connected to the stator plate 26 through the circuit board 24, and a spacer is provided. A ribbon loom, characterized in that the stator plate (26) is mounted to the side plate via elements, preferably spacer bolts (30). The method according to any one of claims 1 to 4, Ribbon loom characterized by a rotation sensor (32) and an electrical regulating device configured to rotate the electric rotating field more rapidly at a fixed pole to pole rate ratio. The method according to any one of claims 1 to 5, The main shaft 10 is mounted through the stator 20 of the hollow structure, characterized in that it comprises a sensor magnet 34 to interlock with the rotation sensor 32 disposed on the circuit board 24 to face the Ribbon loom. The method according to any one of claims 1 to 6, The rotation sensor (32) is ribbon weaving, characterized in that the sensor data associated with the mechanical position of the main shaft (10) is set to be available to the loom.

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