JPS6115313A - Manufacture of transformer - Google Patents

Abstract

PURPOSE:To eliminate the possibility that an iron core is damaged or the magnetic characteristics of the core are deteriorated by effecting the operation of combining an iron core consisting of amorphous alloy and a transformer winding before annealing of the iron core. CONSTITUTION:A winding conductor 2 supplied from a drum 1 is wound on a winding frame having a heat resistance to form a transformer winding 3. Two windings are arranged side by side and an amorphous magnetic alloy strip plate 5 which is wound off from a wound substrance 4 is inserted in a window part 3a of the winding 3 and is wound to obtain a main body of a transformer. This main body is transported into an annealing oven 10 and an excitation power source 11 is connected to the winding 3 so as to flow the predetermined current in the winding 3. At this time, a heater 12 of the annealing oven 10 is also energized to raise a temperature in the oven to the predetermined value. Then the transformer is arranged in the oven for the predetermined time and the magnetic-field annealing of an iron core 6 is done. Consequently, the possibility that the iron core 6 is damaged or the magnetic characteristics of the core 6 are deteriorated is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a transformer in which an iron core is formed from an amorphous magnetic alloy strip.

[Prior Art] Recently, amorphous magnetic alloys have been attracting attention as magnetic materials, and consideration has been given to constructing the iron core of a transformer using amorphous magnetic alloy materials. Amorphous magnetic alloy materials are made of thin strips (
When the core is made of an amorphous magnetic alloy material, it is preferable to adopt a wound core structure.

Conventionally, in the method of manufacturing a transformer using a wound core wound with an amorphous magnetic alloy strip, the wound core is wound and then an annealing excitation winding (hereinafter referred to as excitation winding) is wound around the wound core. Wind the
The wound iron core is carried into an annealing furnace, and the wound iron core is annealed while applying a magnetic field to the wound iron core by energizing the excitation winding.

Next, the excitation winding is unwound from the annealed wound core, and the transformer winding is wound around the core.

[Problems to be Solved by the Invention] In an iron core formed by winding an amorphous magnetic alloy strip, the iron core becomes extremely brittle due to annealing performed in a step after winding the iron core. For this reason, if we apply excitation winding after annealing the core as in the conventional method described above, stress is applied to the core due to the winding process, resulting in chipping of the core or deterioration of magnetic properties. The desired performance cannot be obtained.

In addition, in the conventional method, when annealing the iron core, it is necessary to wind an excitation winding around the iron core and remove the excitation winding after the annealing is completed, which requires a lot of effort and reduces work efficiency. There was a drawback.

An object of the present invention is to provide a transformer that eliminates the risk of deterioration of the magnetic properties of the core and eliminates the need for winding and unwinding the excitation winding during annealing of the core. The goal is to propose a manufacturing method.

[Means for Solving the Problems] In order to solve the problems mentioned above, the present invention forms a transformer winding using a heat-resistant wound conductor and heat-resistant insulating paper, and uses an amorphous magnetic material. A step of forming an iron core using an alloy strip plate and forming a transformer body from the transformer winding and the iron core, and a step of annealing the transformer winding while applying a magnetic field to the iron core by passing a current through the transformer winding. It is something to do.

[Operation of the Invention] As described above, in the present invention, since the work of combining the iron core made of an amorphous magnetic alloy and the transformer winding is performed before the iron core is annealed, there is no possibility that the iron core will be damaged. , it is possible to eliminate the risk of deterioration of the magnetic properties of the iron core. In addition, the transformer winding is formed using a heat-resistant conductor and heat-resistant insulating paper, and annealing is performed while applying a magnetic field to the core by passing a current through the transformer winding. There is no need to perform the winding 1112 work, and the annealing work can be performed efficiently. Therefore, according to the present invention, a transformer with excellent quality can be manufactured at low cost.

[Example] An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the method of the present invention, first, as shown in FIG. 1, a wire-wound conductor 2 supplied from a drum 1 on which the wire-wound conductor is wound is wound around a heat-resistant winding frame (not shown). A transformer winding 3 having a generally rectangular shape as a whole is formed and covered. In this case, use
The winding conductor, winding frame, and interlayer insulating paper are made of materials that can withstand the temperature during annealing of the iron core. The annealing temperature of the iron core formed by winding the amorphous magnetic alloy strip is about 400° C., and the time required for annealing is about 2 hours. Therefore, when forming the above transformer winding, use a primary winding conductor and a secondary winding conductor (for example, polyimide wire with polyimide insulation coating) that can withstand 400°C for 2 hours, and use a winding frame and interlayer insulation. For example, asbestos, ceramic, or ceramic paper manufactured by Toyo Pulp Co., Ltd. is used as the insulating material that makes up the paper.
do.

After forming the transformer windings as described above, as shown in FIG. The amorphous magnetic alloy strip 5 is inserted into the windows 3a, 3a of the transformer windings 3, 3 and wound to form a wound core 6, which is connected to the transformer windings 3, 3. The transformer body is constituted by the iron core 6. In winding this core, a method similar to the known method of winding a toroidal winding around an annular core can be used. That is, a drum composed of two parts is assembled and attached to the part where the iron cores of the parallel transformer windings Fi13.3 are wound, and the amorphous magnetic alloy strip 5 is fixed to the outer periphery of the drum. By rotating , the wound core 6 is wound □. The core winding drum used in this case is made of an i4 thermal insulator similar to that used for the transformer winding.

- After winding the iron core 6 as described above and constructing the transformer body with the iron core 6 and the windings 3, 3, the transformer body is placed into the annealing furnace 10 as shown in FIG. A predetermined magnetic field suitable for magnetic field annealing is generated from the transformer winding by connecting the excitation coil 11 to the transformer winding 3 and passing a predetermined current through the transformer winding 3. . At this time, the heater 12 of the annealing furnace 10 is also energized to maintain a predetermined temperature in the furnace, and the stomach temperature u1 transformer is disposed in the furnace for a predetermined time to perform magnetic field annealing of the iron core 6. After the annealing is completed, change the transformer body)
Complete the transformer by storing it in the T case. As described above, according to the present invention, since the transformer winding and the iron core are combined in a step before annealing, handling is easy and workability is improved. In addition, since current is applied to the transformer winding combined with the iron core to create a magnetic field in the iron core, there is no need to prepare and cover the excitation winding separately, and the work of winding and removing the excitation winding around the iron core is eliminated. This eliminates the need for material costs and man-hours, making it possible to obtain an inexpensive transformer. Furthermore, since the winding and the core are assembled in a step before annealing, a transformer with good magnetic properties can be obtained without stress being applied to the core or chipping of the core.

In the above example, the iron core 6 was constructed by winding an amorphous magnetic alloy strip around a winding wire, but as shown in FIG. One or more magnetic alloy strips may be passed through the window of the winding 3 and combined with the winding to form a rectangular iron core.

In the above embodiment, the core was constructed by first winding the transformer winding and then winding the amorphous alloy strip through the window of the transformer winding, but on the contrary, First, an iron core may be formed from an amorphous magnetic alloy strip before annealing, and then a coil may be wound around the iron core to form the transformer body.

[Effects of the Invention] As described above, according to the present invention, since the work of combining the iron core made of an amorphous magnetic alloy and the transformer winding is performed before the iron core is annealed, the iron core is not damaged. It is possible to eliminate the risk that the magnetic properties of the iron core may be deteriorated. Additionally, during annealing, the already wrapped transformer windings can be used to apply a magnetic field to the core, so there is no need to attach or detach a separate excitation winding, improving the efficiency of annealing. can be done.

[Brief explanation of drawings]

1 to 3 are for explaining embodiments of the present invention.
A cross-sectional view illustrating the process of incorporating the core into the winding. Figure 3 is an explanatory diagram illustrating the state in which the core is carried into the annealing furnace together with the winding and annealing is performed. Figure 4 is a cross-sectional diagram illustrating the process of incorporating the core into the winding. It is a sectional view explaining a modification of the process of incorporating. 2... Winding conductor, 3... Transformer winding, 5... Amorphous magnetic alloy strip, 6... Iron core, 10... Annealing furnace, 1
1... Power supply for excitation, 12... Heater.

Claims (1)

[Claims] A transformer winding is formed using a heat-resistant wound conductor and heat-resistant insulating paper, an iron core is formed using an amorphous magnetic alloy strip, and the transformer body is formed by the transformer winding and iron core. and annealing the iron core while applying a magnetic field to the core by passing a current through the transformer winding.