CN210489415U

CN210489415U - Rogowski coil with novel structure

Info

Publication number: CN210489415U
Application number: CN201921717438.6U
Authority: CN
Inventors: 翟向革
Original assignee: Dandong Dadong Coil Engineering Co ltd
Current assignee: Dandong Dadong Coil Engineering Co ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-05-08
Anticipated expiration: 2029-10-14

Abstract

The utility model discloses a Rogowski coil with a new structure, which is provided with a coil, a framework and welding pins, wherein the framework comprises a winding shaft and an installation base connected with the winding shaft, the installation base is arranged on one side end surface of the winding shaft, the coil is wound on the winding shaft, and four welding pins are inserted into pin through holes reserved in the framework; the one end that the installation base links to each other with the spool is for having the cylindrical of strengthening rib structure, and the other end is the rectangle, and rectangular major axis axial is perpendicular with cylindrical axial, reserves two contact pin through-holes respectively in two minor face department symmetric positions of rectangle, and every contact pin through-hole one end is equipped with the recess on an holding welding needle right angle limit. The utility model discloses the rogowski coil adopts skeleton and welding needle structure, and the rogowski coil who has solved the interior rogowski sensor of fixed electric energy meter's installation problem and made batch production has good uniformity, and the rogowski coil who adopts a plurality of new constructions can expanded current measurement value and precision not change.

Description

Rogowski coil with novel structure

Technical Field

The utility model relates to a be applied to the luo shi coil among the electric energy meter.

Background

With the increasing use amount of household electrical appliances, the requirements on the use amount and the precision of the electric energy meter are also increased continuously, and the metering precision of the electric energy meter depends on the precision of the current sensor. Current sensing devices used by current electric energy meters include resistance sensors (generally, manganese copper non-isolated), electromagnetic sensors (isolated), Rogowski coil sensors (isolated), and Hall sensors (isolated). The electromagnetic sensor, the Rogowski coil sensor and the Hall sensor are all isolated sensors, and the Rogowski coil sensor is used, so that the precision is high, and the cost is moderate. As shown in fig. 1, the rogowski coil is similar to a current transformer, and induces a voltage in the secondary coil, the magnitude of the voltage is proportional to the current path through the isolation inductor. The characteristic is that the Rogowski coil adopts an air core design, which is completely different from a current transformer relying on the magnetic coupling of a high-permeability iron core such as laminated steel and a secondary winding. The air core design has smaller inductance, faster signal response and very linear signal voltage. Because the ordinary Rogowski coil has high winding difficulty and relatively large volume. The portable electric energy meter is suitable for handheld electric energy measuring equipment, but cannot be well fixedly installed in a fixed electric energy meter for application.

SUMMERY OF THE UTILITY MODEL

Big bulky to current luo shi coil wire winding degree of difficulty, can not be fine be applied to fixed electric energy meter medium not enough, the to-be-solved technical problem of the utility model is to provide a new construction luo shi coil that can be applied to in the electric energy meter.

The utility model relates to a new construction rogowski coil has coil, skeleton and welding needle, and wherein, the skeleton includes bobbin and the installation base that links to each other with the bobbin, and on a side end face of bobbin was located to the installation base, the coil winding was on the bobbin, and four welding needles inserted in the contact pin through-hole that the skeleton was reserved.

The one end that the installation base links to each other with the spool is for having the cylindrical of strengthening rib structure, and the other end is the rectangle, and rectangular major axis axial is perpendicular with cylindrical axial, reserves two contact pin through-holes respectively in two minor face department symmetric positions of rectangle, and every contact pin through-hole one end is equipped with the recess on an holding welding needle right angle limit.

The rectangular end face of the mounting base is provided with a positioning lug.

Four welding pins are bent by 90 degrees, are in a group in pairs and are symmetrically arranged in the reserved contact pin through holes of the framework.

The number of the coils is two, and the coils are connected in series in an opposite direction.

The utility model has the following beneficial effects and advantages:

1. the utility model discloses new construction rogowski coil adopts skeleton and welding needle structure, has solved the problem of fixed electric energy meter internal fixation rogowski sensor, and the rogowski coil that adopts a plurality of new constructions can expand current measurement value and precision and does not change.

2. The utility model discloses a skeleton texture makes batch production's luo shi coil have good uniformity.

3. The utility model adopts the gas core as the virtual magnetic core, does not depend on the magnetic coupling of the iron core with high magnetic conductivity such as laminated steel and the secondary winding, has good sensing linearity, no hysteresis effect and no magnetic saturation image, and has almost zero phase error, so that the measuring range can be from a plurality of amperes to hundreds of kiloamperes of current; and direct circuit connection with the measured current is not available, the tolerance of important parts of the framework is strictly required in the production process, and the sensing precision of the Rogowski coil with the new structure is ensured.

Drawings

FIG. 1 is a schematic diagram of a conventional Rogowski coil structure;

fig. 2 is a schematic view of the structure of the rogowski coil of the present invention;

fig. 3 is a schematic diagram of the framework structure of the rogowski coil of the present invention;

fig. 4 is a schematic view of the gas core structure of the rogowski coil of the present invention;

fig. 5 is an electrical structure diagram of the rogowski coil of the present invention.

Wherein, 1 is the skeleton, 101 is the spool, 102 is the installation base, 103 is the contact pin through-hole, 104 is the recess, 105 is the locating convex block, 2 is the welding needle, 3 is the winding, 4 is the gas core.

Detailed Description

As shown in fig. 2-3, the utility model relates to a new construction rogowski coil has coil 3, skeleton 1 and welding needle 2, and wherein, skeleton 1 includes bobbin and the installation base that links to each other with the bobbin, and on a side end face of bobbin was located to the installation base, the coil winding was on the bobbin, and four welding needles 2 inserted in the contact pin through-hole 103 that the skeleton was reserved.

As shown in fig. 4, one end of the mounting base 102 connected to the bobbin 101 is cylindrical with a reinforcing rib structure, the other end is rectangular, the long axis of the rectangle is axially perpendicular to the cylindrical axis, two pin through holes 103 are respectively reserved at symmetrical positions of two short sides of the rectangle, and one end of each pin through hole 103 is provided with a groove 104 for accommodating a right-angled side of the soldering pin 2. The four welding pins 2 are bent by 90 degrees, are in a group, and are symmetrically arranged in the pin through holes 103 reserved in the framework 1. The rectangular end face of the mounting base 102 is provided with a positioning projection 105.

As shown in FIG. 5, the two coils are connected in series in opposite directions, i.e., the start terminal of one coil is connected to the start terminal of the other coil

The utility model discloses new construction rogowski coil is the new construction of deformation of traditional rogowski coil, including skeleton 1, welding needle 2 and coil 3 (adopt the copper winding) to constitute, 4 welding needles insert in the contact pin through-hole 103 that skeleton 1 reserved. One end of the welding pin 2 is a mounting terminal provided for a customer, namely, a terminal welded on a PCB, and the other end is a connecting terminal of a coil, and a copper wire is wound on the welding pin terminal after the coil is wound to form welding connection.

The contact pin through holes reserved at the two short sides of the rectangular structure are circular through holes, the cross section of the welding pin 2 is square, when the welding pin 2 is installed on a PCB, the square welding pin 2 is matched with the circular through holes, and certain drawing force is generated during insertion; if the welding needle 2 and the through hole are square, cracks are easily caused around the hole when the drawing force is reached; if both are circular, the welding pin 2 needs to be disposed and then inserted into a circular hole to secure the drawing force, which increases the cost.

The four welding pins 2 are bent by 90 degrees after being inserted into the pin through holes 103, and two ends of the welding pins 2 extend out of the mounting base 102 and are respectively used as product wiring terminals used by customers and connecting ends inside coils. Two cylindrical bulges are respectively arranged on the two long side parts of the rectangle and are used as positioning columns for being arranged in the PCB.

Because the rogowski coil uses an air core (air is used as a magnetic path and is regarded as a virtual magnetic core), strict requirements are imposed on the size, the inner diameter, the outer diameter, the height and the number of turns of the coil. Firstly, when the framework 1 is manufactured, the precision of the winding amplitude of a winding and the precision tolerance of the diameter of the winding framework are controlled within the range of +/-0.015 mm, and the consistency of the wound coils is ensured; secondly, the winding adopts a high-precision servo daily winding machine, and the consistency of each layer of winding is ensured. The height of a framework winding shaft cylinder is 5.6mm, 50 circles are used for each layer of the enamelled wire with the diameter of 0.1mm, the winding is close to one winding, the number of winding circles is limited to 50 circles by the height of the winding shaft, and the consistency of products is ensured, so that the structural design of the framework 1 plays an important role in ensuring the winding precision; and the welding pin structure design is adopted, so that the installation on the PCB is facilitated.

In this embodiment, the bobbin 101 of the bobbin 1 is a cylindrical shaft with a diameter of 4 mm and a height of 5.6mm, and the coil 3 is tightly wound on the bobbin 101, with a tolerance of ± 0.015 mm.

Compared with the traditional Rogowski coil, the utility model has small volume and easy winding processing; the sensing precision is high; the direct-insertion structure has the advantages of convenience in installation and the like. Can also be a plurality of the utility model discloses connect the use, can enlarge current sensing value, the precision is unchangeable.

Claims

1. A new construction Rogowski coil is characterized in that: the welding wire winding device is provided with a coil, a framework and welding pins, wherein the framework comprises a winding shaft and a mounting base connected with the winding shaft, the mounting base is arranged on one side end face of the winding shaft, the coil is wound on the winding shaft, and the four welding pins are inserted into pin through holes 103 reserved in the framework.

2. The new construction rogowski coil of claim 1, wherein: the one end that the installation base links to each other with the spool is for having the cylindrical of strengthening rib structure, and the other end is the rectangle, and rectangular major axis axial is perpendicular with cylindrical axial, reserves two contact pin through-holes respectively in two minor face department symmetric positions of rectangle, and every contact pin through-hole one end is equipped with the recess on an holding welding needle right angle limit.

3. The new construction rogowski coil of claim 2, wherein: the rectangular end face of the mounting base is provided with a positioning lug.

4. The new construction rogowski coil of claim 1, wherein: four welding pins are bent by 90 degrees, are in a group in pairs and are symmetrically arranged in the reserved contact pin through holes of the framework.

5. The new construction rogowski coil of claim 1, wherein: the number of the coils is two, and the coils are connected in series in an opposite direction.