WO2006133662A1

WO2006133662A1 - Method and device for regulating the tension of a coil winding wire

Info

Publication number: WO2006133662A1
Application number: PCT/DE2006/000563
Authority: WO
Inventors: Frank Neumann
Original assignee: Aumann Gmbh
Priority date: 2005-06-16
Filing date: 2006-03-30
Publication date: 2006-12-21
Also published as: DE102005028053B3

Abstract

The invention relates to a method and a device for regulating the tension of a coil winding wire, whereby a pre-determined retarding force (F1) is applied to the coil winding wire and the respective tension of the wire is detected during the winding process. The aim of the invention is to achieve an almost constant wire tensile stress, even during periodical speed variations (v1) of the wire during the winding process as a result of a non-rotationally symmetrical cross-sectional form of the part to be wound. To this end, the retarding force (F1) is applied to the winding wire in a temporally overlapping manner on the basis of the determined measuring values of a plurality of preceding windings.

Description

Method and device for controlling the wire tension of a coil winding wire

The invention relates to a method for controlling the wire tension of a coil winding wire, in which a predetermined deceleration force is transmitted to the coil winding wire and the respective wire tension of the coil winding wire is detected during the winding process. Furthermore, the invention relates to a device for carrying out the method.

A method and a device of the type mentioned are used in practice in wire draw regulators for winding machines for the processing of filamentary Good, such as aluminum, copper, tungsten, gold and platinum winding wires, especially copper enamel wire. The term "coil winding wire" also includes plastics and glass fibers.

When winding of coils, it is necessary to impose an optimal wire tension, so as to create a dimensionally stable unit on the one hand, for example, additionally connected by means of a baked enamel layer to form a unit, on the other hand to make optimal use of the available winding space.

For this purpose, the coil winding wire is adapted to adapt to the contour of the part to be wound, for example, the coil, the respective required wire tension, with an unacceptable high wire voltage to damage the wire, whereas a too low wire tension can lead to an undefined winding.

The effective and instantaneous wire tension is subject to various influences. One such influence is, for example, the wire speed during the application of the windings to the part to be wound, which can only be regarded as essentially constant in the case of a cylindrical coil of constant diameter.

However, if, as often required in practice, the part to be wound has a deviating from the circular shape cross-sectional shape, a periodically changing relative velocity. In practice, this results in an alternating cycle of shaping edge bending in conjunction with a maximum tensile force and a laying of the wire along the sides with significantly reduced wire tension. Especially with multiple winding layers, this different wire tension leads to disadvantageous winding arrangements.

DE 41 04 087 A1 discloses an electronic wire tension regulator to be used together with a commercial winding machine for winding copper enamel wires on rectangular or round bobbins. All states during the winding operation of an electronic control sensory detected and regulated by the necessary actuators. For this purpose, the wire coming from the wire supply is passed over a wire cleaner and a wire tensioner, so that a low, moderately constant wire tension is generated. The wire is now passed over an electromotive wire brake so that an electronic control can determine the mean wire tension by means of the torque of the motor. Subsequently, the wire runs over a spring / mass system with high natural frequency. Coarse wire tension shocks can be absorbed directly mechanically here. The controller can determine the mean wire tension from the state of the spring system. Now, the wire is guided over a lever with small amplitude and small positioning time, so that the resulting when winding angular coils periodic modulation of the wire is compensated by changing the wire route. The still existing inertia of the deflection roller of the wire control device can be corrected by pre-acceleration in periodic oscillations in the compensation unit. For this purpose, a wire tension sensor is arranged in the course of the wire between the part to be wrapped and the compensation unit, by means of which a suitable electronic evaluation determines the correct time for deflection of the deflection roller with the aid of a magnet. As a result, as the wire tension increases, a suitable amount of wire is released to catch the subsequent wire kick.

A disadvantage of this system proves the comparatively long reaction time, due to the mechanical mass system, the deflection roller must first be accelerated against gravity. Furthermore, in this way the fluctuations conditions of the wire tension only attenuated, but not compensated, because with regard to the detected by means of Drahtzugaufnehmers wire tension change, the unwanted influence on the winding to be created has already occurred substantially irreversible. In particular, therefore, only a further increase in the wire tension can be counteracted by means of the known method.

DE 43 13 255 A 1 relates to a device and a circuit for controlling the wire tension on winding machines for the production of electrical coils, consisting of a Vorbremsvorrichtung, a main brake device, a wire tension measuring device and an electrical circuit for adjusting the deceleration force of the main brake device due to the measured wire tension value. The wire tension measuring device has at least one swivel arm carrying a yarn guide, a position sensor which measures the pivoting of the swivel arm, and a servo motor which applies a restoring force to the swivel arm against the tensile force of the wire. By means of a processor periodically recurring wire tension fluctuations are detected and fed back to the brake in such a way that the fluctuations are optimally eliminated.

A disadvantage also proves in this device, the delayed initiation of the counterforce, so that while the fluctuations optimally eliminated within the physical limits of the system, but can not be avoided.

Furthermore, DE 103 17 536 A1 describes a method for winding coils for electrical appliances and machines onto a circumferential area which is substantially rectangular in cross-section. In this case, a winding wire drawn off from a supply roll is fed by means of a wire motor acting as an electric motor with opposite to the wire drawing direction driven wire brake roller under a controllable tension by a wire guide of the coil. As a wire brake, a servo motor is used whose torque is controlled in dependence on the instantaneous rotational angle position of the relative movement between the spool and the wire guide.

It proves to be disadvantageous in this case that the method presupposes precise knowledge, in particular as control-technical availability of the geometric data of the part to be wound, and is therefore associated with the user with considerable additional effort.

DE 196 38 238 C1 discloses a method and a device for controlling the tensile force of a coil winding wire, wherein a delay device is provided, in wel- rather, the coil winding wire is subjected to a certain deceleration force. Spaced apart from the delay device, a wire deflection device is provided which has a sensor which measures the respective wire deflection and generates an output signal corresponding to the respective wire deflection. The device has a control circuit in which the output signal of the sensor form the control variable to be compared with a desired value and the delay device form the actuator.

Again, the mechanical deflection of the wire proves to be disadvantageous, which also changes in the deflection of the direction of action of the wire tension on the sensor and therefore error influences are unavoidable.

Furthermore, wire tension regulators are also known from DE 34 36 187 C2, DE 40 35 862 C2, EP 05 64 018 A2, DE 690 22 160 T2, DE 40 19 443 A1, DE 41 29 803 A1 and DE 40 19 140 A1 known.

The invention has for its object to provide a method for controlling the wire tension of a Spulenwickeldraht.es, the short reaction time allows a nearly completely constant wire tension. Furthermore, an apparatus for carrying out the method is to be created.

The first object is achieved by a method according to the features of claim 1. The dependent claims 2 to 7 relate to particularly expedient developments of the method according to the invention.

Thus, according to the invention, a method is provided in which the winding force is superimposed on the deceleration force on the basis of the detected measured values of a plurality of preceding windings in such a way that the wire tension is substantially constant. The invention is based on the recognition that a wire tension can then be kept almost ideally constant even at high winding speeds when the periodically changing wire speed of the part to be wound or the winding needle resulting from the winding process is superimposed on the deceleration force, which leads to a constant total wire tension leads. In this case, the deceleration force is not applied chronologically after the metrological detection of a changed wire tension, but rather in time before a measurable change. The control signal used here are measured values taken from a previous measurement cycle or empirical values that can be stored in a database and linked to geometric data of the part to be wound. The additionally imprinted Delay force is a function of the current of the acting as a brake delay device. This makes it possible for the first time, contrary to the state of the art, which discloses only measures to respond to wire voltage fluctuations to reduce the resulting error influences already counteract the emergence of the wire voltage fluctuation.

In particular, in the case of the wire tension for winding coils, a superposition with the wire speed which varies as a result of the winding is thus set to a constant wire tension, the initiation of which is thereby effected simultaneously with the change in the wire speed.

The required deceleration force could be determined from the wire tension detected in previous measurement cycles. On the other hand, it is particularly promising if the time course of the deceleration force depends on a change in the wire speed recorded in previous measurement cycles. As a result, the time profile of the wire speed and thus the deceleration force can be detected directly, so that in particular repercussions of the total spring-mass system on the wire tension determinable by means of the sensor can be avoided.

In this case, the time sequence of a relative change in speed of a rotating wire supply roll and / or wire guide roller is detected in a particularly advantageous manner, so as to ensure a reliable determination of the wire speed. Alternatively, a relative rotation angle change of the rotating part to be wound or of the winding needle relative to the wire supply or wire guide roller can also be determined, so that a relative rotational movement is detected directly and a computational determination can be dispensed with.

In practice, it proves to be particularly useful if detected at a occurring wire voltage fluctuation of the time course of a possible wire voltage fluctuation of a single winding and the determination of the deceleration force is used as a correction value, in order to achieve a gradual optimization of the deceleration force for each subsequent winding to reach. Of course, the delay force optimized in this way and its time course can also be stored in a memory and assigned to another identical or similar part to be wound as the basis for a winding program. Furthermore, it is particularly promising if, in an iterative process, the amount of the deceleration force or the temporal course of the deceleration force and the respectively detected fluctuation of the wire tension are detected and fed to the control unit for evaluation, in particular comparative consideration, thus gradually approaching to reach the constant wire tension. In this case, the adaptation of the wire tension is not tied to a complete cycle, but can also take place during the circulation. For the first time, an adaptive system is created whose optimization process is improved with each part to be wound.

It has been found that particularly good results are achieved when the change in the deceleration force of the expected wire speed change is temporally superimposed in advance in order to be able to easily compensate for the inertia of the wire speed in a simple manner.

The second object, to provide a device for carrying out the method, according to the invention is achieved in that the delay device is designed to transmit a periodically variable deceleration force due to the variations in the wire speed. As a result, the deceleration force is applied without a change in the path of the wire or a local displacement of the wire guide and in a temporal overlap of the variable wire speed.

In this case, it proves to be particularly practical if the deceleration device has an electromagnetic brake unit in order in this way to achieve a rapid change in the deceleration force with a very short time delay. Knowing the duration of the delay, this wire speed can also be initiated anticipatory.

A particularly promising alternative for detecting the deceleration force is achieved even when the sensor has a strain gauge which can be associated, for example, with a deflection provided with a support arm.

It is particularly advantageous if the wire guide or the course of the wire is determined independently of the deceleration force and the wire tension, so that in particular inertial influences caused by deflecting paths that can be influenced by actuators are excluded. For this purpose, a modification of the present invention is particularly well, in which the delay device has a voice coil actuator, which has an optimum reaction rate.

Another likewise particularly expedient modification is also achieved in that the sensor has a capacitive force measuring sensor, which thereby enables a non-contact detection of the wire tension.

The invention allows for various embodiments. To further clarify its basic principle, one of them is shown in the drawing and will be described below. This shows in

Figure 1 is a schematic diagram of a device for controlling the wire tension in a first angular position of a part to be wound.

2 shows the device shown in Figure 1 in a changed angular position of the part to be wound.

Figure 3 shows the course of deceleration force and a wire speed in dependence on the angular position of the part shown in Figures 1 and 2 to be wound.

4 shows a device for regulating the wire tension of a coil winding wire in a side view;

Fig. 5, the device shown in Figure 4 in a perspective view.

Figures 1 and 2 show in a schematic representation of an apparatus for controlling the wire tension of a coil winding wire, with a braking device designed as a delay device, for transmitting a predetermined deceleration force F1, F2 on the coil winding wire. By means of a sensor, the wire tension of the coil winding wire is detected during rotation ω and fed to a control unit. In order to avoid an undesired fluctuation of the wire tension due to the periodically fluctuating wire speed vi, v2 due to the non-rotationally symmetrical winding surface of the part to be wound as a coil, the delay force FI ₁ F2 on the coil winding wire becomes time-delayed on the basis of the detected measured values of a plurality of preceding windings superimposed imprinted so that the wire tension is substantially constant. The time course of the wire speeds vi, v2 and the measured tensile force F _m v superposed impressed deceleration force and the tensile force F _oV without the superimposed impressed deceleration force is shown by a diagram in Figure 3, on the abscissa, the angular position ω of the part to be wound and on the ordinate the wire speeds between the extremes vi and v2 and the tensile forces F _mV and F _o v are plotted.

Figures 4 and 5 show a device for controlling the wire tension of a coil lenwickeldrahtes 1. The coil winding wire 1 is guided on the device by means of a FiIz- Vorbremse 2, two rollers 3, 4 and a guided on a balance arm 6 roller 5, which in Figure 4 is also shown in its extended position. The pivotable balance arm 6 is limited in its pivoting movement by a equipped with a sensor 19 stop 18. The actuation of the compensating arm 6 takes place by means of a motor 20, whose force is detected by means of a housed in a housing 22 sensor 21. For transmitting a deceleration force to the coil winding wire 1, the device is equipped with a delay device 7 which can be actuated by means of an electromagnetic brake unit 8 designed as a lifting magnet. The deceleration device 7 has a sensor 10 equipped with a strain gauge, which is equipped with a deflection roller 9 for the coil winding wire 1. The sensor 10 is used to detect the wire tension of the coil winding wire 1, so as to detect by means of a arranged in a housing 12 of the device control unit 13 periodic variations of the arrowhead 11 connected to the part to be wound coil winding wire 1. An input of essential parameters, such as geometry data of the part to be wound is possible by means of an input field 15, wherein a representation of the operating state by means of a display 14 takes place. In addition, a connection of a production control system by means of an interface 16 is possible. For easy arrangement, the device is provided for fixing to a commercial mounting profile 17.

Claims

PATE NTANSP RICK

1. A method for controlling the wire tension of a coil winding wire, in which a predetermined deceleration force is transmitted to the coil winding wire and the respective wire tension of the coil winding wire is detected during the winding process, characterized in that the coil winding wire, the deceleration force due to the detected measured values of several previous windings superimposed superimposed time is that the wire tension is substantially constant.

2. The method according to claim 1, characterized in that for controlling the wire tension in the winding of coils, a superposition with the winding conditionally fluctuating wire speed a constant wire tension is set.

3. The method according to claims 1 or 2, characterized in that the time course of the deceleration force in dependence of a detected on the basis of the previous measurement cycles change in the wire speed.

4. The method according to at least one of the preceding claims, characterized in that the time sequence of a relative change in speed of a rotating wire supply roll and / or wire guide roller is detected.

5. The method according to at least one of the preceding claims, characterized in that the time profile of a possible wire voltage fluctuation of a single winding detected and the determination of the deceleration force is used as a correction value.

6. The method according to at least one of the preceding claims, characterized in that detected in an iterative process, the amount of the deceleration force and / or the time course of the deceleration force and the respectively detected variation of the wire tension and supplied by the control unit of an evaluation, in particular comparative consideration ,

7. The method according to at least one of the preceding claims, characterized in that the change in the deceleration force of the expected wire speed change is superimposed temporally leading ahead.

8. Device for controlling the wire tension (tensile force F _m v) of a coil winding wire (1), with a delay device (7), for transmitting a predetermined deceleration force (F1, F2) on the coil winding wire (1), with a sensor (10) for Detecting the wire tension (tensile force F _mV ) of the coil winding wire (1) and with a control unit (13), characterized in that by means of the control unit (13) periodic fluctuations can be detected and the delay means (7) for transmitting a periodically variable deceleration force (F1, F2) due to the variations in wire speed (vi, v2).

9. Apparatus according to claim 8, characterized in that the delay device (7) comprises an electromagnetic brake unit (8).

10. Apparatus according to claim 8 or 9, characterized in that the sensor (10) has a strain gauge.

11. The device according to at least one of claims 8 to 10, characterized in that the wire guide and / or the course of the coil winding wire (1), regardless of the deceleration force (F1, F2) / wire tension (tensile force F _mV ) is determined.