CN114709055B - A multi-emission anti-offset loosely coupled transformer and its compensation circuit - Google Patents

A multi-emission anti-offset loosely coupled transformer and its compensation circuit

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Publication number
CN114709055B
CN114709055B CN202210342972.3A CN202210342972A CN114709055B CN 114709055 B CN114709055 B CN 114709055B CN 202210342972 A CN202210342972 A CN 202210342972A CN 114709055 B CN114709055 B CN 114709055B
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main
magnetic core
coil
side magnetic
inductance
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CN114709055A (en
Inventor
洪江锟
赵晓东
王孟哲
陈洪欢
陈张平
孔亚广
黄娜
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Hangdian Haining Information Technology Research Institute Co ltd
Hangzhou Dianzi University
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Hangdian Haining Information Technology Research Institute Co ltd
Hangzhou Dianzi University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

The invention discloses a multi-transmitting anti-offset loose coupling transformer applied to rotary ultrasonic processing, which comprises an annular secondary side magnetic core and three arc-shaped primary side magnetic cores, wherein the radial outer wall of the secondary side magnetic core is wound with secondary side coils, the primary side magnetic cores are provided with primary side coils, a plurality of primary side magnetic cores are uniformly distributed on the radial outer wall of the secondary side magnetic core, and gaps are arranged between the opposite sides of the secondary side magnetic cores and the primary side magnetic cores. The main side magnetic cores of the multi-emission loose coupling transformer are arranged around the auxiliary side magnetic cores at equal angles, so that the coupling coefficient of the transformer is improved, the magnetic flux of the primary and auxiliary side magnetic cores is uniformly distributed, no matter which direction the auxiliary side magnetic cores are offset to a certain extent, and the fluctuation range of the overall coupling coefficient of the transformer is small.

Description

Multi-emission type anti-offset loose coupling transformer and compensation circuit thereof
Technical Field
The invention relates to the technical field of non-contact power transmission, in particular to a multi-transmission type anti-offset loose coupling transformer applied to rotary ultrasonic processing and a compensation circuit thereof.
Background
With the continuous development of material science, novel hard and brittle materials represented by sapphire, carbon fiber composite materials and novel ceramics are widely applied in the fields of consumer electronics, advanced optics, aerospace and the like due to the characteristics of high temperature resistance, wear resistance and high hardness. But it is very difficult to process due to its excellent physical properties. The rotary processing technology is used as a novel special processing technology, has the characteristics of long service life of a cutter, good processing quality, high processing precision and the like, and has proved to be an effective method for processing novel hard and brittle materials.
Unlike the tools of conventional machine tools, the ultrasonic tools typically incorporate transducers inside, driven by an ultrasonic power source, which converts electrical energy into mechanical energy via the inverse piezoelectric effect, thereby producing micron-sized amplitude-assisted machining at the tool tip. The prior proposal for supplying power to the ultrasonic cutter is divided into two types, namely contact type power transmission represented by a carbon brush and a conductive slip ring and non-contact type power transmission represented by a rotary loose coupling transformer. The non-contact type electric energy transmission has the advantages of no rotation speed limit, no friction, good safety and the like, and the former is gradually replaced. In the actual machining process, a plurality of ultrasonic cutters are often required to be replaced according to the actual machining process, and in order to meet the flexibility of automatic cutter replacement, students and engineers design a loose coupling transformer with an arc-shaped main side magnetic core, for example, patent CN107104514A and CN107124042A, so that automatic cutter replacement in the machining process of a machine tool is realized. However, in practical application, the novel loosely coupled transformer is found to have low coupling coefficient, is easy to cause magnetic core saturation, has extremely high requirement on the assembly precision of a machine tool, and can cause great fluctuation of the coupling coefficient of the transformer due to tiny deviation generated by the primary and secondary magnetic cores after tool changing, so that the transmission efficiency and the output power are influenced, and the consistency of machined workpieces is finally influenced.
Disclosure of Invention
Aiming at the existing defects of the novel loose coupling transformer, the invention provides the multi-emission type anti-offset loose coupling transformer and the compensation circuit thereof, which not only improve the coupling coefficient of the loose coupling transformer, but also realize stable electric energy transmission even if the primary side magnetic core and the secondary side magnetic core have certain relative offset, and simultaneously maintain the flexibility of automatic tool changing of a machine tool.
In order to solve the technical problems, the technical scheme of the invention is as follows:
The utility model provides a multi-emission anti-offset loose coupling transformer, is including being annular vice limit magnetic core and three curved main limit magnetic core, the radial outer wall round joint of vice limit magnetic core has the vice limit coil, be provided with the main limit coil on the main limit magnetic core, three the radial outer wall at vice limit magnetic core is arranged to main limit magnetic core partition arrangement, be equipped with the clearance between the opposite side of vice limit magnetic core and main limit magnetic core.
Preferably, a groove is formed in the inner side of the main side magnetic core, and the main side coil is wound on the main side magnetic core along the groove.
Preferably, the radial outer wall of the secondary side magnetic core is provided with an annular groove, and the secondary side coil is wound on the annular groove.
Preferably, the core angle α of the main side core is 60 °.
Preferably, the winding direction and the number of turns of the main side coils of the three main side magnetic cores are the same.
The invention also discloses a compensation circuit of the multi-emission type anti-offset loose coupling transformer, which comprises a power input voltage U i, an equivalent series resistor R P1、RP2、RP3 of three main side coils, self inductance L P1、LP2、LP3 of the three main side coils, self inductance L S of a secondary side coil, a power supply voltage U, An equivalent series resistance R S of the secondary coil, The output end of the power supply input voltage U i is respectively connected with one ends of three equivalent series resistors R P1、RP2、RP3, the other ends of the three equivalent series resistors R P1、RP2、RP3 are respectively connected with one ends of self-inductance L P1、LP2、LP3 of the corresponding three main side coils, the other ends of the self-inductance L P1、LP2、LP3 of the three main side coils are grounded, the self-inductance L S of the auxiliary side coils, An equivalent series resistance R S of the secondary coil, The equivalent impedance R t and the equivalent capacitive impedance X t of the ultrasonic transducer are sequentially connected in series, and the self inductance L S of the secondary side coil and the self inductance L P1、LP2、LP3 of the three main side coils matched with each other are mutually inductive.
Preferably, a main-side compensation capacitor C P is added between the power input voltage U i and the equivalent series resistance R P1、RP2、RP3 of the three main-side coils.
Preferably, a secondary compensation capacitor C S is arranged between the self-inductance L S of the secondary coil and the equivalent capacitance X t.
The invention has the following characteristics and beneficial effects:
By adopting the technical scheme, the main side magnetic cores of the multi-emission type loose coupling transformer are arranged around the auxiliary side magnetic cores at equal angles, so that the coupling coefficient of the transformer is improved, the magnetic flux of the primary side magnetic cores and the secondary side magnetic cores are uniformly distributed, no matter which direction the auxiliary side magnetic cores deviate to a certain extent, and the fluctuation range of the overall coupling coefficient of the transformer is very small. And secondly, an anti-offset compensation circuit suitable for a multi-emission type loose coupling transformer is provided, the secondary side capacitor is used for matching the secondary side coil inductance, and a single primary side capacitor is used for matching the inductances of all primary side coils, so that all primary side coils are regarded as a whole, the inductance variation during offset is reduced, the output power and the transmission efficiency of a system are finally kept in a stable range, and the consistency of the processing quality of rotary ultrasonic processing is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of a multi-emission type anti-offset loose-coupling transformer core structure according to an embodiment of the present invention.
Fig. 2 is an overall schematic diagram of a multi-emitter anti-offset loosely coupled transformer in accordance with an embodiment of the present invention.
Fig. 3 illustrates a multi-emission type non-contact power transmission mutual inductance coupling model according to an embodiment of the present invention.
In the figure, a 1-secondary side magnetic core, a 2-primary side magnetic core, a 3-groove, a 4-annular groove, a 5-gap, a 6-primary side coil and a 7-secondary side coil.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention provides a multi-transmitting anti-offset loose coupling transformer, which comprises an annular secondary side magnetic core 1 and three arc-shaped primary side magnetic cores 2, wherein the radial outer wall of the secondary side magnetic core 1 is wound with a secondary side coil 7, the primary side magnetic core 2 is provided with a primary side coil 6, the three primary side magnetic cores 2 are uniformly distributed on the radial outer wall of the secondary side magnetic core 1, and a gap 5 is arranged between the opposite sides of the secondary side magnetic core 1 and the primary side magnetic core 2. The inner side of the main side magnetic core 2 is provided with a groove 3, and the main side coil 6 is wound on the main side magnetic core 2 along the groove. The radial outer wall of the secondary side magnetic core 1 is provided with an annular groove 4, and the secondary side coil 7 is wound on the annular groove 4. The core angle α of the main side core 2 is 60 °. The winding direction and the winding number of the main side coils 6 of the three main side magnetic cores are the same.
Specifically, three main side cores 2 are wound around the sub side core 1 at intervals of 360 °/3=120°.
It can be appreciated that in practical application, the three main side magnetic cores 2 are assembled on the ultrasonic machine tool, and when the tool is required to be changed, 1 or a plurality of main side magnetic cores can be moved, so that the ultrasonic tool assembled with the auxiliary side magnetic cores 1 can be transversely or longitudinally moved, and the flexibility requirement of tool changing is met. In this case, the secondary side magnetic core 1 can move transversely with the ultrasonic cutter after the primary side magnetic core 2 is moved.
Further, a through hole is formed in the center of the secondary side magnetic core 1 for assembling an ultrasonic cutter.
According to the technical scheme, the main side magnetic cores of the multi-transmission loose-coupling transformer are arranged around the auxiliary side magnetic cores at equal angles, so that the structure is simple, the coupling coefficient of the transformer is improved, meanwhile, the magnetic flux of the primary side magnetic cores and the secondary side magnetic cores are uniformly distributed, no matter which direction the auxiliary side magnetic cores deviate to a certain extent, the fluctuation range of the overall coupling coefficient of the transformer is very small, the output power and the transmission efficiency of the system are kept in a stable range, and the consistency of the processing quality of rotary ultrasonic processing is ensured.
The invention also discloses a compensation circuit of the multi-emission type anti-offset loose coupling transformer, which comprises a power input voltage U i, an equivalent series resistance R P1、RP2、RP3 of three main side coils, self inductance L P1、LP2、LP3 of the three main side coils, as shown in figure 3, Self-inductance L S of the secondary coil, equivalent series resistance R S of the secondary coil, The output end of the power supply input voltage U i is respectively connected with one ends of three equivalent series resistors R P1、RP2、RP3, the other ends of the three equivalent series resistors R P1、RP2、RP3 are respectively connected with one ends of self-inductance L P1、LP2、LP3 of the corresponding three main side coils, the other ends of the self-inductance L P1、LP2、LP3 of the three main side coils are grounded, the self-inductance L S of the auxiliary side coils, An equivalent series resistance R S of the secondary coil, The equivalent impedance R t and the equivalent capacitive impedance X t of the ultrasonic transducer are sequentially connected in series, and the self inductance L S of the secondary side coil and the self inductance L P1、LP2、LP3 of the three main side coils matched with each other are mutually inductive.
Through the technical scheme, the mutual inductance between L P1 and L P2、LP2 and the mutual inductance between L P3、LP1 and L P3 are obtained, and the mutual inductance between M 12,M23,M13;LP1、LP2、LP3 and L S is respectively obtained, so that M 1S、M2S and M 3S are obtained.
According to a coupling coefficient calculation formula of the multi-emission type loose coupling transformer
When the primary side magnetic core and the secondary side magnetic core are deviated, the coupling coefficient K does not fluctuate greatly because all the primary side magnetic cores are regarded as a whole.
Further, to compensate for reactive power present in the overall circuit, reducing the current stress of the power supply requires compensation for the overall current. The invention provides a coupling model of multi-emission type non-contact electric energy transmission, which provides an anti-offset compensation method of a series-series capacitor,
Specifically, a main-side compensation capacitor C P is added between the power input voltage U i and the equivalent series resistors R P1、RP2、RP3 of the three main-side coils.
It can be understood that, unlike the conventional compensation method, the anti-offset compensation method of the present invention does not compensate each main coil individually, but performs parallel equivalent to the self inductance L P1、LP2、LP3 of the main coil, and since L P1＝LP2＝LP3＝LPi,LPi is the self inductance corresponding to the i-th main coil, where i=1, 2,3
When the primary and secondary side magnetic cores generate certain relative offset, the self inductance of one part of the primary side coils is certainly reduced, and the self inductance of the other part of the primary side coils is increased, so that the fluctuation of the equivalent primary side inductance L P is small, and the primary side compensation capacitor C P can still perform reactive compensation on a circuit under the condition of certain offset.
Specifically, a secondary compensation capacitor C S is arranged between the self inductance L S of the secondary coil and the equivalent capacitance X t.
It will be appreciated that the secondary compensation capacitance C S is used primarily to compensate the secondary coil self-inductance L S and the transducer equivalent capacitive reactance X t, and thereforeWherein omega s＝2πfs is the angular frequency corresponding to the series resonant frequency f s of the connected transducer, and X ts is the equivalent capacitive reactance of the transducer operating at the resonant frequency.
In this example, the above technical solutions are specifically analyzed by table 1 and table 2:
TABLE 1 parameter Table for multiple emission type loosely coupled transformers during offset
Table 1 shows the coupling coefficient fluctuation diagram of the multi-emission type loose coupling transformer at the time of offset, and it can be seen that the coupling coefficient K is slightly increased and the variation is very small at the time of slight offset.
Transmission efficiency Output power
Initial state 91.18% 4.6028
(Transverse direction) 74.50% 4.2945
(Transverse direction) 68.24% 4.155
Table 2 table of transmission efficiency and output power variation of multiple emission type loosely coupled transformer at offset
Table 2 shows the transmission efficiency and the output power change table of the multi-emission type loose coupling transformer during offset, and it can be seen that the multi-emission type loose coupling transformer and the compensation circuit thereof can maintain relatively stable output power and transmission efficiency and ensure the processing quality of rotary ultrasonic processing even when slight offset occurs.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments, including the components, without departing from the principles and spirit of the invention, yet fall within the scope of the invention.

Claims (5)

1. The utility model provides a multi-transmission anti-offset loose coupling transformer, its characterized in that, including being annular vice limit magnetic core (1) and three curved main limit magnetic core (2), the radial outer wall wiring of vice limit magnetic core (1) has vice limit coil (7), be provided with main limit coil (6) on main limit magnetic core (2), three main limit magnetic core (2) partition arrangement sets up the radial outer wall at vice limit magnetic core (1), be equipped with clearance (5) between the opposite side of vice limit magnetic core (1) and main limit magnetic core (2), the inboard of main limit magnetic core (2) is provided with recess (3), main limit coil (6) are along the recess wiring on main limit magnetic core (2), the radial outer wall wiring of vice limit magnetic core (1) is provided with ring channel (4), vice limit coil (7) wiring is on ring channel (4), and the three the wire winding direction of main limit coil (6) on main limit magnetic core (2) is the same with the number of turns of coil.
2. A multiple-emitter anti-offset loose-coupling transformer according to claim 1, characterized in that the core angle α of the main side core (2) is 60 °.
3. A compensation circuit for a multi-transmit anti-offset loosely coupled transformer in accordance with claim 1 or 2, comprises a power input voltage U i, an equivalent series resistance R P1、RP2、RP3 of three main side coils, self inductance L P1、LP2、LP3 of the three main side coils, Self-inductance L S of the secondary coil, equivalent series resistance R S of the secondary coil, The output end of the power supply input voltage U i is respectively connected with one ends of three equivalent series resistors R P1、RP2、RP3, the other ends of the three equivalent series resistors R P1、RP2、RP3 are respectively connected with one ends of self-inductance L P1、LP2、LP3 of the corresponding three main side coils, the other ends of the self-inductance L P1、LP2、LP3 of the three main side coils are grounded, the self-inductance L S of the auxiliary side coils, An equivalent series resistance R S of the secondary coil, The equivalent impedance R t and the equivalent capacitive impedance X t of the ultrasonic transducer are sequentially connected in series, and the self inductance L S of the secondary side coil and the self inductance L P1、LP2、LP3 of the three main side coils matched with each other are mutually inductive.
4. The compensation circuit of claim 3, wherein a main compensation capacitor C P is added between the power input voltage U i and the equivalent series resistance R P1、RP2、RP3 of the three main coils.
5. The multi-emitter anti-offset loosely coupled transformer compensation circuit of claim 3, wherein a secondary compensation capacitor C S is disposed between the self inductance L S of the secondary coil and the equivalent capacitive reactance X t.
CN202210342972.3A 2022-04-02 2022-04-02 A multi-emission anti-offset loosely coupled transformer and its compensation circuit Active CN114709055B (en)

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Publication number Priority date Publication date Assignee Title
CN105529836B (en) * 2016-01-25 2017-12-05 北京航空航天大学 A kind of non-contact inductive electric supply installation for ultrasonic Milling Process
US11710988B2 (en) * 2019-09-27 2023-07-25 Apple Inc. Magnetic alignment systems with NFC for electronic devices
CN113887017B (en) * 2021-09-09 2022-04-22 杭州电子科技大学 Electric energy transmission device structure and parameter optimization design method thereof
CN114093620B (en) * 2022-01-20 2022-04-19 南京航空航天大学 Magnetic integrated matrix transformer and isolated DC/DC converter

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Title
应用于旋转超声加工的非接触式电能传输系统设计与研究;洪江锟;中国优秀硕士学位论文全文数据库 (工程科技Ⅱ辑);20240331;29-32 *

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