IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0490541
(2002-09-24)
|
우선권정보 |
SE-0103196(2001-09-24) |
국제출원번호 |
PCT/EP02/010700
(2002-09-24)
|
§371/§102 date |
20041018
(20041018)
|
국제공개번호 |
WO03/029121
(2003-04-10)
|
발명자
/ 주소 |
- Alatalo,Mikael
- Tholander,Lars Helge Gottfrid
|
출원인 / 주소 |
|
대리인 / 주소 |
Flynn, Thiel, Boutell &
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
7 |
초록
▼
The invention relates to a yarn feeding device (F) for weaving or knitting machines whose winding element (W) is driven by an electric motor (M) controlled by an electronic speed control device (CU). According to the invention, the electric motor (M) is a synchronous motor, in particular, a permane
The invention relates to a yarn feeding device (F) for weaving or knitting machines whose winding element (W) is driven by an electric motor (M) controlled by an electronic speed control device (CU). According to the invention, the electric motor (M) is a synchronous motor, in particular, a permanent magnet (PM) motor with the speed control device (CU) provided for effecting a permanent vector control with the stator being sinusoidally acted upon. Continuously determined information pertaining to the relevant rotational position of the rotor (R) of the motor (M) is used in the speed control device (CU), which serves to perform permanent vector control, in order to adjust at least one predetermined rotational position (X1, X2) of the winding element (W).
대표청구항
▼
The invention claimed is: 1. Yarn feeding device for weaving machines or knitting machines, the yarn feeding device comprising a housing in which a shaft provided with a winding element is rotatably supported, a storage surface for yarn windings formed by the winding element, sensor assemblies at l
The invention claimed is: 1. Yarn feeding device for weaving machines or knitting machines, the yarn feeding device comprising a housing in which a shaft provided with a winding element is rotatably supported, a storage surface for yarn windings formed by the winding element, sensor assemblies at least for scanning the yarn windings, an electric motor consisting of a stator part and a rotor which is connected to the shaft for rotating the winding element, and an electronic speed control device of the electric motor which electronic speed control device is connected for signal transmissions with the sensor assemblies and the electric motor, and a position control and position observation at least for adjusting the winding element by the electric motor into at least one predetermined rotary stop position in relation to the housing, wherein the electric motor is a synchronous motor controlled by the speed control device, the speed control device having a microprocessor for a permanent vector control of the electric motor by detecting the relative rotary position of a vector of the rotor to determine the relative rotary rotor position and by rotating a stator vector in relation to the detected vector of the rotor by sinusoidal stator actuation, and wherein the predetermined rotary stop position of the winding element is adjusted by stopping the electric motor by use of the permanently determined vector control information in the speed control device. 2. Yarn feeding device as in claim 1, wherein the electric motor is a permanent magnet motor containing magnetized and structured permanent magnets distributed in the rotor according to a predetermined geometry, and wherein the distribution, structure and magnetization of the permanent magnets are selected such that a sinusoidal course of backwards acting electromotive force is induced in the stator part by the relative rotor rotation. 3. Yarn feeding device as in claim 2, wherein the electric motor is a sensor-free permanent magnet motor, and wherein a calculation circuit is provided in the speed control device for permanently calculating the relative rotor rotary position with the help of indirect measurements of the induced electromotive force. 4. Yarn feeding device as in claim 1, wherein at least one rotary position sensor is provided in the yarn feeding device for detecting a predetermined rotary stop position either of the rotor or of the winding element, and wherein the rotary stop sensor is connected to the speed control device. 5. Yarn feeding device as in claim 4, wherein the rotary position sensor comprises permanent magnets distributed along the circumference of the winding element and at least one Hall sensor detection element fixed to the housing, which detection element either responds digitally to the passage of each permanent magnet or has an analog response to the relative rotary position of a respective pair of permanent magnets. 6. Yarn feeding device as in claim 1, wherein a plurality of predetermined relative rotary positions of the winding element is programmed within a 360째 rotation in the speed control device. 7. Yarn feeding device as in claim 1, wherein a yarn length measuring device is interlinked with the speed control device for permanently transmitting information on the relative rotary position to the yarn length measuring device for measuring by means of the information on the relative rotary position of the rotor the rotation travel of the winding element representing a wound on yarn length on the storage surface either as fed between the start and the end of the driving period or between selected points in time or selected different relative rotary positions of the rotor. 8. Yarn feeding device as in claim 1, wherein one predetermined rotary stop position of the winding element is a relative rotor rotary position in which an exit opening of the winding element connected to the rotor is aligned with a threading path positioned in a stationary position in the housing of the yarn feeding device. 9. Yarn feeding device as in claim 1, wherein one predetermined rotary stop position of the winding element is a rotor rotary position where an exit opening of the winding element is stopped in relation to the housing in a semi-threading position where the exit opening is positioned at the side of housing parts obstructing a manual access from the outside to the exit opening. 10. A method of operating a yarn feeding device for weaving machines or knitting machines, the yarn feeding device having a winding element defining a storage surface for yarn windings and being disposed on a shaft that is rotatably supported in a housing, a sensor assembly adapted to scan the yarn windings, a synchronous electric motor with a stator fixed with respect to the housing and a rotor connected to the shaft for rotating the winding element, and an electronic speed control device connected for signal transmissions with the sensor assembly and the electric motor and adapted to monitor rotary position of the shaft and control the speed of the electric motor, the method comprising: detecting a relative rotary position of a vector of the rotor to determine the rotary rotor position relative to the stator; rotating a stator vector in relation to the detected vector of the rotor by sinusoidal stator actuation; controlling the speed of the electric motor through continuous vector control of the electric motor; and stopping rotation of the shaft by controlling the electric motor to position the winding element in a predetermined rotary stop position in relation to the housing by use of the permanently determined vector control information in the speed control device. 11. The method of operating a yarn feeding device of claim 10, including determining the relative rotary rotor position by calculation based upon indirect measurements of induced electromotive force in the stator. 12. The method of operating a yarn feeding device of claim 10, including permanently transmitting information on the relative rotary rotor position to a yarn length measuring device. 13. A yarn feeding device comprising: a winding element defining a storage surface for yarn windings and being rotatably supported in a housing; a sensor assembly adapted to scan the yarn windings; a synchronous electric motor with a stator fixed with respect to the housing and a rotor connected to rotate together with the winding element; and an electronic speed control device connected for signal transmissions with the sensor assembly and the electric motor and adapted to monitor the rotary position of the winding element and control the rotational speed of the electric motor, the electronic speed control device being adapted to detect a relative rotary position of a vector of the rotor to determine the relative rotary rotor position, rotate a stator vector in relation to the detected vector of the rotor by sinusoidal stator actuation, control rotational speed of the electric motor through continuous vector control of the electric motor, and stop rotation of the winding element at a predetermined rotary stop position in relation to the housing by controlling the electric motor by use of the continuously determined vector control information. 14. The yarn feeding device of claim 13, wherein the electric motor is sensor-free, and wherein the speed control device comprises a microprocessor adapted to calculate the relative rotor rotary position based upon indirect measurements of induced electromotive force in the stator. 15. The yarn feeding device of claim 13, wherein a threading path is positioned in a stationary position in the housing, an exit opening is disposed in the winding element, and the predetermined rotary stop position of the winding element corresponds to a relative rotor rotary position at which the exit opening of the winding element is aligned with the threading path. 16. The yarn feeding device of claim 13, wherein an exit opening is disposed in the winding element, and the predetermined rotary stop position of the winding element corresponds to a relative rotor rotary position at which the exit opening of the winding element is disposed in relation to the housing in a semi-threading position wherein the exit opening is positioned to the side of housing parts obstructing manual access from the outside to the exit opening.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.