JPS638093Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotary transformer that transmits and receives electrical signals in a non-contact manner, and more specifically relates to a transformer core used in a rotary rotary transformer.

Conventional rotary transformer cores are made by forming a material with high magnetic permeability, such as ferrite, into a flat cylindrical shape, with concentric grooves formed on its surface, and a coil that transmits and receives electrical signals is installed in these grooves. Most of it was stuff. Therefore, transformer cores used in rotary transformers with different characteristics and functions had to be manufactured separately according to their characteristics and functions. Therefore, for the molds used to manufacture transformer cores, a set of dedicated molds corresponding to the above-mentioned characteristics and functions is essential. This means that when manufacturing many types of rotary transformers, dedicated molds for the number of types are required, and the management of these molds is complicated and is also an economic problem.

This invention was made to solve these problems, and its purpose is to form circular grooves with different diameters on the front and back surfaces of the rotary transformer core. The purpose of this invention is to provide multiple types of rotating transformer cores with different characteristics and functions.

Preferred embodiments of this invention will be described below with reference to the drawings. FIG. 1 shows the first embodiment, and is a longitudinal cross-sectional view of a rotary transformer in which grooves of different diameters are formed on the front and back surfaces of a core for a rotary transformer, and FIG. 1a shows a coil in one groove. Figure b shows a state in which a coil is attached to the other concave groove. FIG. 2 shows a second embodiment, in which the number of grooves into which coils are installed is varied in order to form rotary transformers with different numbers of channels on the front and back surfaces of the rotary transformer core. FIG. In the first embodiment shown in FIG. 1, a drive shaft for rotationally driving the transformer core 1 is located at the center of the transformer core 1, which is formed into a flat cylindrical shape using a material having high magnetic permeability such as ferrite. A shaft hole 2 to be inserted is bored in a predetermined shape. Further, on the front and back surfaces of the transformer core 1, concave grooves 4a each having a concentric shape and having different diameters are provided, in order to accommodate the coil 3 formed into a flat circular shape that transmits and receives electric signals in a non-contact manner. 4b is formed. The coil 3 is installed in this groove using an adhesive. In this way, in the first embodiment, the transformer core 1
Since grooves 4a and 4b with different diameters are formed on the front and back surfaces of the coil, the coil 3 is installed in the groove 4a (as shown in Figure 1a) and the coil 3 is installed in the groove 4b. In the case (shown in Figure 1b),
Rotating transformers with different characteristics can be obtained.

FIG. 2 shows another embodiment of the rotary transformer core according to this invention. In this second embodiment, a transformer core 1 is formed into a flat cylindrical shape from a high magnetic permeability material such as ferrite, a shaft hole 2 is bored in the center of the transformer core 1, and a coil 3 is inserted into the formed groove. This embodiment is the same as the first embodiment, but this embodiment is different from the first embodiment in that the number of channels accommodated on the front and back surfaces of the transformer core 1 is different. That is, concentric grooves having a predetermined width and different diameters are formed at four locations on the front surface of the transformer core 1, and two concentric grooves are formed on the back surface. Therefore, when the front surface is used, it becomes a 4-channel rotary transformer, and when the back surface is used, it becomes a 2-channel rotary transformer.

Forming the grooves on the front and back surfaces of the transformer core 1 in this way allows the lead terminal portion formed of a printed wiring board to be used to extract the electrical signal transmitted to the coil 3 in the rotary transformer to the outside. , functions as a flow stopper to prevent the adhesive from spilling out when adhesive is attached to the non-attached surface of the coil 3 of the transformer core 1, and can also be used to position the lead terminal part. It is. Further, the grooves formed on the back surface increase the magnetic resistance between the coils and improve the crosstalk characteristics between the coils. Furthermore, when attaching other members to the back surface of the transformer core 1, by pouring adhesive into the groove where the coil 3 is not attached,
It can be attached to the back surface of the transformer core 1 without using an adhesive.

As described above, the rotary transformer core according to the present invention has a transformer core made of ferrite or the like having high magnetic permeability and formed into a flat cylindrical shape, and a plurality of coils disposed within the transformer core. In a rotary transformer that transmits and receives electrical signals while rotating, grooves for mounting the coil arranged in the transformer core are formed concentrically and with different diameters on the front and back surfaces of the transformer core. However, it can be applied to multiple types of rotary transformers with different characteristics and functions, and since a core for rotary transformers with multiple types of characteristics and functions can be provided with one type of dedicated mold, there is no need to worry about the complexity of mold management. This is an extremely economical and economically advantageous idea.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a rotary transformer showing a first embodiment of the core for a rotary transformer according to the invention, and Fig. 1a shows a case where a coil is installed in one groove, and Fig. shows the case where a coil is attached to the other groove. FIG. 2 is a longitudinal cross-sectional view of a rotary transformer showing a second embodiment of the rotary transformer core according to the invention. In each figure, 1...transformer core, 2...shaft hole, 3...coil, 4a, 4b...concave groove.

Claims (1)

[Scope of utility model registration request] A rotary transformer that transmits and receives electrical signals through a transformer core formed in a flat cylindrical shape with high magnetic permeability such as ferrite, and a plurality of coils arranged within the transformer core while relatively rotating and moving. In this method, concave grooves for mounting the coil arranged in the transformer core are formed concentrically on the front and back surfaces of the transformer core and have different diameters, so that it can be applied to multiple types of rotary transformers with different characteristics and functions. A core for a rotating transformer that is characterized by: