CN112071502A

CN112071502A - Signal transmission line, manufacturing method thereof and motor driving system

Info

Publication number: CN112071502A
Application number: CN202011041760.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Suzhou Zhendi Intelligent Technology Co Ltd
Current assignee: Suzhou Zhendi Intelligent Technology Co Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2020-12-11

Abstract

The embodiment of the application provides a signal transmission line, a manufacturing method thereof and a motor driving system, wherein the signal transmission line comprises: the inner core is formed by stranding a plurality of conductors; the insulating layer is wrapped outside the inner core, and two ends of the inner core extend out of the insulating layer; the shielding layer is wrapped outside the insulating layer, two ends of the shielding layer extend out of the insulating layer, and two ends of the shielding layer are respectively connected with two ends of the inner core; and the outer skin layer is wrapped outside the shielding layer. The application realizes the reduction of the impedance of the signal transmission line.

Description

Signal transmission line, manufacturing method thereof and motor driving system

Technical Field

The application relates to the technical field of cloud platforms, in particular to a signal transmission line, a manufacturing method of the signal transmission line and a motor driving system.

Background

The cloud platform is the support equipment who is used for installing and fixed camera, all is provided with the signal line in the cloud platform equipment and is used for connecting camera and each motor, plays the effect of transmission signal. Most of existing cradle head equipment carries out signal transmission through an FPC (Flexible Printed Circuit) connecting wire, but because the cradle head can drive the FPC connecting wire to do reciprocating bending movement, the FPC connecting wire is extremely easy to break and damage.

With the gradual miniaturization of the holder device, in order to save space and improve bending resistance, the micro coaxial cable is mostly used as a driving signal transmission line of the motor, but the impedance of the inner conductor of the micro coaxial cable is large, and the driving voltage of the motor is divided by the signal transmission line, so that the power utilization efficiency is low.

Disclosure of Invention

An object of the embodiments of the present application is to provide a signal transmission line, a method for manufacturing the same, and a motor driving system, so as to reduce impedance of the signal transmission line.

A first aspect of an embodiment of the present application provides a signal transmission line, including: the inner core is formed by stranding a plurality of conductors; the insulating layer is wrapped outside the inner core, and two ends of the inner core extend out of the insulating layer; the shielding layer is wrapped outside the insulating layer, two ends of the shielding layer extend out of the insulating layer, and two ends of the shielding layer are respectively connected with two ends of the inner core; and the outer skin layer is wrapped outside the shielding layer.

In one embodiment, the inner core, the insulating layer, the shielding layer and the outer skin layer are coaxially disposed.

In one embodiment, the conductor of the inner core is a silver-plated copper alloy wire or a tin-plated copper alloy wire.

In one embodiment, the insulating layer is made of FEP material or PFA material.

In one embodiment, the shielding layer is formed by winding a plurality of conductors.

In one embodiment, the shielding layer is woven from a plurality of conductors.

In one embodiment, the outer skin layer is made of one of FEP material, PFA material, ETFE material, PVC material, and PET material.

In one embodiment, the outer diameter of the signal transmission line is less than or equal to 1 mm.

A second aspect of embodiments of the present application provides a motor drive system, including: the signal transmission line according to the first aspect of the embodiments of the present application and any embodiment thereof; the inverter is connected with a power supply and comprises a first bridge arm, a second bridge arm and a third bridge arm; and three windings of the three-phase motor are respectively connected to the first bridge arm, the second bridge arm and the third bridge arm through the signal transmission lines.

A third aspect of the embodiments of the present application provides a method for manufacturing a signal transmission line, including: twisting a preset number of conductors into an inner core; extruding and molding an insulating layer outside the inner core to wrap the inner core; a shielding layer wrapping the insulating layer outside the insulating layer; extruding and molding outside the shielding layer to form an outer skin layer wrapping the shielding layer; removing the insulating layer and the outer skin layer at two ends of the signal transmission line to expose the inner core and the shielding layer; and twisting the exposed inner core and the shielding layer.

In the technical scheme of this application, a signal transmission line and manufacturing method and motor drive system thereof are provided, signal transmission line includes inner core, insulating layer, shielding layer and cortex, and the inner core and the shielding layer at signal transmission line both ends are connected, can effectively reduce signal transmission line's impedance to promote signal transmission line transmission signal's effect, and signal transmission line external diameter is little, and bending resistance can be good, and the space occupies for a short time. The motor driving system adopts the signal transmission line to connect the three-phase motor and the inverter, and the signal transmission line with low impedance can effectively reduce the partial pressure of the signal transmission line on the motor driving voltage, thereby improving the power utilization rate.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a signal transmission line according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a signal transmission line according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a motor drive system according to an embodiment of the present application;

fig. 4 is a flowchart illustrating a method for manufacturing a signal transmission line according to an embodiment of the present application.

Reference numerals:

100-signal transmission line, 110-inner core, 120-insulating layer, 130-shielding layer, 140-outer skin layer, 200-motor driving system, 210-inverter, 211-first bridge arm, 2111-first power switch tube, 2112-second power switch tube, 212-second bridge arm, 2121-third power switch tube, 2122-fourth power switch tube, 213-third bridge arm, 2131-fifth power switch tube, 2132-sixth power switch tube, 220-three-phase motor, 221-first winding, 222-second winding, 223-third winding, 101-first signal transmission line, 102-second signal transmission line and 103-third signal transmission line.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, the terms "first," "second," and the like are used for distinguishing between descriptions and do not denote an order of magnitude, nor are they to be construed as indicating or implying relative importance.

In the description of the present application, the terms "comprises," "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

In the description of the present application, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are absolutely required to be horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", and the like refer to orientations or positional relationships that are based on orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally found in the products of the application, and are used for convenience in describing the present application, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description of the present application, the terms "mounted," "disposed," "provided," "connected," and "configured" are to be construed broadly unless expressly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Please refer to fig. 1, which is a schematic structural diagram of a signal transmission line 100 according to an embodiment of the present application, wherein the signal transmission line 100 includes: the cable comprises an inner core 110, an insulating layer 120, a shielding layer 130 and an outer skin layer 140, wherein the inner core 110 is formed by twisting a plurality of conductors, the insulating layer 120 wraps the inner core 110, the insulating layer 120 extends out of two ends of the inner core 110, the shielding layer 130 wraps the insulating layer 120, the insulating layer 120 extends out of two ends of the shielding layer 130, two ends of the shielding layer 130 are respectively connected with two ends of the inner core 110, and the outer skin layer 140 wraps the shielding layer 130.

Because the inner core 110 and the shielding layer 130 are connected at two ends, the impedance of the signal transmission line 100 is reduced, and when the signal transmission line 100 is used for transmitting signals, the voltage division is also reduced, which is beneficial to improving the signal transmission capability of the signal transmission line 100.

In one embodiment, the signal transmission line 100 can be used to connect an electrical device such as a three-phase motor without a ground wire and without a ground shield, thereby performing high-speed signal transmission.

As shown in fig. 2, which is a schematic cross-sectional view of a signal transmission line 100 according to an embodiment of the present application, the signal transmission line 100 includes: the signal transmission line comprises an inner core 110, an insulating layer 120, a shielding layer 130 and an outer skin layer 140, wherein the inner core 110, the insulating layer 120, the shielding layer 130 and the outer skin layer 140 are coaxially arranged from inside to outside in sequence, and the outer diameter of the signal transmission line 100 is smaller than or equal to 1 mm. The inner core 110 is formed by twisting a plurality of conductors, and in one embodiment, the conductors forming the inner core 110 are silver-plated copper alloy wires or tin-plated copper alloy wires. The insulating layer 120 may be made of fluoroplastic having good mechanical and physical properties, high and low temperature resistance, electrical properties, and flame retardancy. In one embodiment, the insulating layer 120 is made of FEP (Fluorinated ethylene propylene) material or PFA (polytetrafluoroethylene) material.

In one embodiment, the shielding layer 130 is formed by winding a plurality of conductors. In one embodiment, the shielding layer 130 is woven from a plurality of conductors. In one embodiment, the conductor constituting the shielding layer 130 is a silver-plated copper alloy wire or a tin-plated copper alloy wire.

In one embodiment, the outer skin layer is made of one of FEP material, PFA material, ETFE (ethylene-tetra-fluoro-ethylene, ethylene-tetrafluoroethylene copolymer) material, PVC (Polyvinyl chloride) material, and PET (Polyethylene terephthalate) material. The signal transmission line 100 has good mechanical and physical properties and has strong bending and torsion resistance.

As shown in fig. 3, which is a schematic structural diagram of a motor driving system 200 according to an embodiment of the present application, the motor driving system 200 includes: the motor comprises a signal transmission line 100, an inverter 210 and a three-phase motor 220, wherein the inverter 210 is connected with a power supply, and the three-phase motor 220 is connected with the inverter 210 through the signal transmission line 100.

In an embodiment, inverter 210 includes a first leg 211, a second leg 212, and a third leg 213, where first leg 211, second leg 212, and third leg 213 are connected in parallel and to a same power source.

The first bridge arm 211 comprises a first power switch tube 2111 and a second power switch tube 2112, the second bridge arm 212 comprises a third power switch tube 2121 and a fourth power switch tube 2122, the third bridge arm 213 comprises a fifth power switch tube 2131 and a sixth power switch tube 2132, wherein the first power switch tube 2111 and the second power switch tube 2112 are connected in series, the third power switch tube 2121 and the fourth power switch tube 2122 are connected in series, and the fifth power switch tube 2131 and the sixth power switch tube 2132 are connected in series.

The three-phase motor 220 includes a first winding 221, a second winding 222 and a third winding 223, the first winding 221 is connected between a first power switch 2111 and a second power switch 2112 of the first bridge arm 211 through a first signal transmission line 101, the second winding 222 is connected between a third power switch 2121 and a fourth power switch 2122 of the second bridge arm 212 through a second signal transmission line 102, and the third winding 223 is connected between a fifth power switch 2131 and a sixth power switch 2132 of the third bridge arm 213 through a third signal transmission line 103.

In an embodiment, the conductors of the inner core 110 and the shielding layer 130 of the signal transmission line 100 are used together as a transmission medium for the driving signal of the three-phase motor 220, and because the inner core 110 is connected with the shielding layer 130, the impedance of each signal transmission line 100 is small, the voltage division of the driving voltage of the motor is also small, and the power utilization rate is improved.

Fig. 4 is a schematic flow chart of a signal transmission line manufacturing method according to an embodiment of the present disclosure, which can be used to manufacture the signal transmission line 100 to reduce the impedance of the signal transmission line 100 and improve the signal transmission effect of the signal transmission line 100. The method comprises the following steps:

step 310: a predetermined number of conductors are twisted into the inner core 110.

In the above step, a predetermined number of conductors are twisted into the inner core 110 by a twisting machine.

Step 320: an insulating layer 120 is extruded over the inner core 110 to wrap the inner core 110.

In the above step, the insulation layer 120 wrapping the inner core 110 is extrusion-molded outside the inner core 110 by an extrusion molding apparatus.

Step 330: a shield layer 130 is formed on the insulating layer 120 to surround the insulating layer 120.

In the above steps, the shielding layer 130 wrapping the insulating layer 120 may be formed by winding the insulating layer 120 by a winding device, or the shielding layer 130 wrapping the insulating layer 120 may be formed by weaving the insulating layer 120 by a weaving device.

Step 340: an outer skin layer 140 is extruded over the shield layer 130 to wrap the shield layer 130.

In the above step, the outer skin layer 140 wrapping the shield layer 130 is extrusion-molded outside the shield layer 130 by an extrusion molding apparatus.

Step 350: the insulating layer 120 and the outer skin layer 140 at both ends of the signal transmission line are removed to expose the inner core 110 and the shield layer 130.

In the above steps, the insulating layer 120 and the outer skin layer 140 with the preset lengths at the two ends of the signal transmission line may be removed by laser cutting, or the insulating layer 120 and the outer skin layer 140 with the preset lengths at the two ends of the signal transmission line may be removed by directly stripping, so that the inner core 110 and the shielding layer 130 are exposed at the two ends of the signal transmission line 100.

Step 360: the exposed inner core 110 and the shield layer 130 are twisted.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only a preferred embodiment of the present application, and is only for the purpose of illustrating the technical solutions of the present application, and not for the purpose of limiting the present application. Any modification, equivalent replacement, improvement or the like, which would be obvious to one of ordinary skill in the art and would be within the spirit and principle of the present application, should be included within the scope of the present application.

Claims

1. A signal transmission line, comprising:

the inner core is formed by stranding a plurality of conductors;

the insulating layer is wrapped outside the inner core, and two ends of the inner core extend out of the insulating layer;

the shielding layer is wrapped outside the insulating layer, two ends of the shielding layer extend out of the insulating layer, and two ends of the shielding layer are respectively connected with two ends of the inner core;

and the outer skin layer is wrapped outside the shielding layer.

2. The signal transmission line of claim 1, wherein the inner core, the insulating layer, the shielding layer, and the outer skin layer are coaxially disposed.

3. The signal transmission line of claim 1, wherein the conductor of the inner core is a silver-plated copper alloy wire or a tin-plated copper alloy wire.

4. The signal transmission line of claim 1, wherein the insulating layer is made of FEP material or PFA material.

5. The signal transmission line of claim 1, wherein the shield is wound from a plurality of conductors.

6. The signal transmission line of claim 1, wherein the shield is braided from a plurality of conductors.

7. The signal transmission line of claim 1, wherein the outer jacket layer is made of one of FEP material, PFA material, ETFE material, PVC material, and PET material.

8. The signal transmission line of claim 1, wherein the signal transmission line has an outer diameter of less than or equal to 1 millimeter.

9. A motor drive system, comprising:

the signal transmission line of any one of claims 1-8;

the inverter is connected with a power supply and comprises a first bridge arm, a second bridge arm and a third bridge arm;

and three windings of the three-phase motor are respectively connected to the first bridge arm, the second bridge arm and the third bridge arm through the signal transmission lines.

10. A method of manufacturing a signal transmission line, comprising:

twisting a preset number of conductors into an inner core;

extruding and molding an insulating layer outside the inner core to wrap the inner core;

a shielding layer wrapping the insulating layer outside the insulating layer;

extruding and molding outside the shielding layer to form an outer skin layer wrapping the shielding layer;

removing the insulating layer and the outer skin layer at two ends of the signal transmission line to expose the inner core and the shielding layer;

and twisting the exposed inner core and the shielding layer.