CN1006340B - Orthogonal field transformer - Google Patents

Abstract

"Orthogonal magnetic field transformer" is a transformer with a cavity inside the iron core designed according to the orthogonal magnetic field theory. Two sets of primary and secondary coils can be placed on the core of the transformer at the same time, and one of the primary and secondary coils is Put it on the iron core column according to the conventional method, and put the other set of original and side coils into the inner cavity of the iron core. Two sets of primary and secondary coils produce a synthetic magnetic field but are two mutually independent circuits, which can transmit electromagnetic energy separately, so that one transformer core material can be used as two sets, which effectively improves the material utilization rate and expands Increased transformer capacity and reduced cost. The invention can be used in various single and three-phase transformers.

Description

The invention is a transformer.

Existing transformers are mainly composed of iron cores and primary and secondary coils sheathed on the iron core columns. When the primary coil is connected to the AC power supply, a reciprocating and alternating closed magnetic circuit is formed in the iron core, and the induced potential is obtained in the secondary coil by electromagnetic induction. Because the transformer with this structure can only transmit one electromagnetic energy, its iron core material consumes a lot, the utilization rate is low, the iron consumption is large, and the copper consumption also increases accordingly. Manufacturing costs are high and transportation is difficult.

The task of the present invention is to propose a transformer designed according to the theory of orthogonal magnetic fields. For this transformer, one transformer core material is used as two transformer cores, so as to greatly expand the design capacity of the transformer and effectively improve the capacity of the transformer. The utilization rate of iron core materials, reducing iron consumption and copper consumption, reducing volume, reducing weight, and reducing costs, etc.

The solution to the above task is to use double-oriented electrical silicon steel sheets to form a closed core with a cavity inside the core, and place two sets of primary and secondary coils on the core, and one set of primary and secondary coils is sleeved on the core column. Another set of primary and secondary coils is placed in the cavity inside the iron core. The two sets of primary and secondary coils are two mutually independent circuits. Then generate mutually perpendicular magnetic fields to determine. In this way, when the two primary side coils are fed with alternating current, two mutually perpendicular alternating magnetic fields are applied to the same soft magnetic body, that is, the transformer iron core, and an alternating magnetic field with vector amplitude synthesis is generated in the iron core. According to the principle of electromagnetic induction, the induced potential will be obtained simultaneously in the two side coils.

If the two alternating magnetic fields applied to the iron core are of equal amplitude, same frequency, and same phase, then the combined magnetic induction in the iron core is that of any alternating magnetic field magnetized alone. $\sqrt{2}$ times, its magnetization form is reciprocating magnetization form.

If the two alternating magnetic fields applied to the iron core are of equal amplitude, same frequency, and phase difference of 90°, the combined magnetic induction in the iron core is equal to the magnetic induction of any alternating magnetic field magnetized alone, and its magnetization form is Rotational magnetization form.

If the two alternating magnetic fields applied to the iron core have the same frequency, but the phase and amplitude are not equal, the resultant magnetic induction in the iron core is between the above two cases.

In the present invention, two sets of primary and secondary coils are placed on a transformer core at the same time to form two mutually independent and non-interfering circuit systems, which can transmit electromagnetic energy separately at the same time, thereby greatly expanding the design capacity of the transformer. Effectively improve the utilization rate of core material. In terms of transformers with the same capacity, the present invention uses less iron core material than the prior art. If the same amount of iron core material is consumed, the capacity of the present invention is improved compared with the prior art. Therefore, the present invention can reduce the volume accordingly and lighten the load. Weight, reduce iron consumption, save iron core material and copper consumption, and reduce cost.

The invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a sectional view of a specific structure of the present invention.

Fig. 2 is an A-A sectional view of the transformer in Fig. 1 .

Fig. 3 is a tube assembled from a C-shaped coiled iron core.

Fig. 4 is a sectional view of another specific structure of the present invention.

Fig. 5 is a B-B sectional view of the transformer in Fig. 4 .

Fig. 6 is the shape of the upper half after the primary and secondary coils are wound on the inner cylinder of the transformer core column in Fig. 4 .

Referring to Figure 1, the iron core column 1 and the iron yoke 2 of the transformer core are preferably assembled with a C-shaped coiled core formed by rolling long silicon steel sheets into a cylinder with a circular cross-section as shown in Figure 3. The iron core column 1 and the iron yoke The iron yoke 2 is fastened with clips 3 to form a closed iron core, and here, the clips 3 are buckled. In order to make the core have a continuous closed internal cavity, the connection between the core column and the iron yoke can be V-shaped or arc shape or 45° bevel. A set of primary coil 4 and secondary coil 5 are concentrically placed in the inner cavity of the iron core. In the specific structure shown in Figure 1, the primary coil 4 and the secondary coil 5 are wound along the core closing direction. Concentrate the coil. A hollow tube made of insulator or other insulating supports are sandwiched between the primary and secondary coils to form a cooling channel 6, which is not only conducive to cooling but also plays an insulating role. The cooling channel in the inner cavity of the iron core passes through the inner core of the iron yoke. The hole communicates with the outside world. The lead-out wires of the original and secondary coils 4 and 5 can also be drawn out from the inner hole of the iron yoke, and an insulating layer 7 is arranged between the coil and the iron core cavity wall. Generally, the primary and secondary coils 4 and 5 are pre-wound and put into the inner cavity of the iron core concentrically. The core is wound on the core column, and there is also a cooling channel between the primary coil 8 and the secondary coil 9, and an insulating layer 7 is also provided between the coil and the core.

Fig. 4 has provided another kind of specific structure of the present invention. In this structure, the core column 1 of the transformer core is a double-tube cylinder with a double annular cross-section composed of an inner cylinder 11 and an outer cylinder 12. The inner cylinder 11 is preferably a C-shaped coil formed by long silicon steel sheets. Rolled iron cores are assembled, and there are notches 14 at the two ends of the inner cylinder, so that the original and secondary coils 4 and 5 can pass through the inner cylinder through the inner cylinder notches and surround the inner and outer walls of the inner cylinder to form an inner cylinder with two flat ends. Cylinder, its shape is shown in Figure 6. The outer cylinder 12 can be assembled with a C-shaped rolled iron core, or it can also be made of annular silicon steel sheets. The iron yoke 2 is made of silicon steel sheets. , Pay side coil 4,5 leads. Both the primary side coil 4 and the secondary side coil 5 pass through the inner cylinder and are wound around the inner and outer walls of the inner cylinder. After the coils pass through the notch 14 of the inner cylinder, they are evenly distributed and arranged on the inner and outer walls of the inner cylinder, as shown in FIG. 6 . The original and secondary coils 4 and 5 can be spaced around the inner cylinder, or the secondary coil 5 can be firstly encircled, and then the primary coil 4 can be encircled outside it, and vice versa. There should be a cooling channel between the original coil and the secondary coil, and the cooling channel communicates with the outside world through the outlet hole 13 of the yoke. There should be an insulating layer between the coil and the cylinder wall. After fastening the iron core column and iron yoke with clamp 3, another set of primary side coil 8 and secondary side coil 9 can be placed by the previous method. Here clamping part 3 can be the screw rod that cross section is U shape, makes it pass through iron yoke hole 13 and iron core post inner cylinder. inner hole and fastened with nuts.

When the alternating current is passed into the primary coils 4 and 8 of the above two examples at the same time, there are two mutually perpendicular alternating magnetic fields applied to the same core column. When the alternating currents of the two primary coils are different , then the composite magnetic induction in the iron core will appear in the three situations mentioned above, so the induced potentials will be obtained in the two side coils 5 and 9 respectively.

Practice shows that a transformer with a capacity of 0.8-1.25KVA can be increased to 8-12.5KVA by using the present invention, and the copper consumption and no-load loss of the transformer are correspondingly reduced.

The invention is not only applicable to various single-phase transformers, but also various three-phase transformers.

Claims (5)

1. An orthogonal magnetic field transformer, comprising a closed iron core composed of an iron core post [1] and an iron yoke [2], and a set of primary side coils [8] and secondary side coils [9] sheathed on the iron core posts. It is characterized in that there is a cavity inside the iron core, and another set of primary coil [4] and secondary coil [5] are placed in the cavity, and the two sets of primary and secondary coils [4, 5] and [8, 9] are Two mutually independent circuits generate magnetic fields perpendicular to each other. 2. The orthogonal magnetic field transformer according to claim 1, characterized in that the iron core column (1) and the iron yoke (2) are all made of C-shaped coiled iron cores and have a circular cross-section. 3. The orthogonal magnetic field transformer according to claim 1 or 2, characterized in that the primary coil (4) and the secondary coil (5) are both concentrated coils wound along the core closing direction. 4. The orthogonal magnetic field transformer according to claim 1, characterized in that the iron core column (1) is a double-tube cylinder with a double annular cross section composed of an inner cylinder (11) and an outer cylinder (12), and the inner cylinder The two ends of cylinder have notch (14); Hole (13) is arranged in the iron yoke (2), for leading out wire. 5. The orthogonal magnetic field transformer according to claim 4, characterized in that the primary coil (4) and the secondary coil (5) are both coils passing through the inner cylinder (11) and wound around the inner and outer walls of the inner cylinder.

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