JPH0521415U - Coaxial rotary transformer - Google Patents

Abstract

(57) [Summary] [Purpose] A coaxial rotary transformer with an improved rotor core structure and improved crosstalk characteristics. [Structure] Inner stator core 1 and outer rotor core 2
In the coaxial type rotary transformer, the channel coils 3 are arranged at respective opposing positions, the short ring grooves 6 are provided between the respective channel coils 3 of the inner stator core 1, and the short rings 4 are processed in the grooves. A coaxial type rotary transformer characterized by using a rotor core 2 having a structure in which a ring-shaped groove 5 having a concave shape along the inner peripheral surface is formed in the middle of each channel coil groove 7 of the outer rotor core 2. [Effect] A coaxial rotary transformer having excellent crosstalk resistance can be supplied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coaxial rotary transformer used in electronic equipment, and relates to a structure of a rotary transformer core used in the coaxial rotary transformer and having improved crosstalk.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, a coaxial rotary transformer is composed of an inner stator core 1 and an outer rotor core 2 as shown in FIG. 2, and a number of channel coils 3 corresponding to the required number of channels are provided at opposite positions of each core. It is wound in the channel coil groove 7. Further, in the inner stator core 1, the short ring 4 is wound in the short ring groove 6 provided between the channel coil grooves 7 in order to improve the crosstalk characteristic. It is common to install the short ring only on the inner stator core. However, at present, there is a demand for downsizing and weight reduction of coaxial rotary transformers, the height of the core is becoming lower, and the pitch between each channel coil becomes narrower. There was a problem that the crosstalk characteristics of the rotary rotary transformer deteriorated.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to solve the above problems and improve the structure of the outer rotor core of the coaxial rotary transformer to provide a coaxial rotary transformer having high crosstalk resistance.

[0004]

[Means for Solving the Problems]

 The present invention uses a rotor core having a structure in which a concave groove is provided on the inner peripheral surface of the rotor core on the outer peripheral side of the coaxial rotary transformer at a position facing the groove for the short ring of the inner stator core. Provide a coaxial rotary transformer with improved crosstalk and excellent crosstalk resistance. That is, according to the present invention, the channel coils are arranged at the positions where the inner stator core and the outer rotor core are opposed to each other, the groove for the short ring is provided between the channel coils of the inner stator core, and the short ring is formed in the groove. In the coaxial rotary transformer, the rotor core having a structure in which a concave ring-shaped groove along the inner peripheral surface is formed in the middle of each channel coil groove of the outer rotor core is used. It is a trans.

[0005]

[Action]

 By providing a groove between the channels of the rotor core on the outer peripheral side of the coaxial rotary transformer, each magnetic circuit of each channel coil is divided on the rotor transformer side with the groove as a boundary. Therefore, the magnetic flux excited by the coil during signal transmission hardly affects other coils, and crosstalk can be reduced.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a rotor core and a stator core according to an embodiment of the present invention in a mounted state around the core. As shown in FIG. 1, the coaxial rotary transformer is composed of an inner stator core 1 and an outer rotor core 2, and the inner stator core is provided with a number of channel coils 3 corresponding to the required number of channels at opposite positions of each core. It is wound in the groove for the channel. Further, the short ring 4 is provided at a predetermined position of the short ring groove 6 provided between the channel coil grooves 7. On the outer rotor core, the channel coil 3 is wound in a channel coil groove 7 at a position facing each channel coil of the stator core, and a groove having a concave shape is also provided at a position facing the short ring groove 6 of the stator core 1. 5 are provided. This groove 5 separates each magnetic circuit for each channel coil of the rotor core, and prevents the magnetic flux excited during signal transmission from leaking to other channel coils. As a result, the signal of each channel coil reduces crosstalk without affecting other channels. In the embodiment shown in FIG. 1, it is a sectional view of the periphery of the core of a 4-channel coaxial rotary transformer. A short ring 4 is provided between each channel coil 3 of the inner stator core 1, and an unwound groove 5 is also arranged between each channel coil 3 of the outer rotor core 2. The core shape is such that the rotor core 2 has an outer diameter φ20, an inner diameter φ18, and a height of 15 mm, and the stator core 1 has an outer diameter φ17.9, an inner diameter φ15, and a height of 15 mm. As a result, the crosstalk was improved by 15% as compared with the conventional rotor core having the same outer diameter dimension and that having no groove and the coaxial rotary transformer using the core of the above embodiment.

[0007]

[Effect of the device]

 As described above, crosstalk is provided by providing a concave ring ring groove on the inner peripheral surface of the outer rotor core of the coaxial rotary transformer of the present invention at a position facing the short ring portion of the inner stator core. It is possible to provide a coaxial rotary transformer that is improved and has good crosstalk characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view around a core of a coaxial rotary transformer according to the present invention.

FIG. 2 is a cross-sectional view around a core of a conventional coaxial rotary transformer.

[Explanation of symbols]

 1 Stator core 2 Rotor core 3 Channel coil 4 Short ring 5 Groove 6 Short ring groove 7 Channel coil groove

Claims (1)

[Scope of utility model registration request] 1. An inner stator core and an outer rotor core are provided with channel coils at respective opposing positions, a groove for a short ring is provided between respective channel coils of the inner stator core, and a short ring is formed in the groove. A coaxial type rotary transformer characterized by using a rotor core having a structure in which a ring-shaped groove having a concave shape along the inner peripheral surface is formed in the middle of each channel coil groove of the outer rotor core.